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124-665: Lake Toba ( Indonesian : Danau Toba , Toba Batak : ᯖᯀᯬ ᯖᯬᯅ; romanized : Tao Toba ) is a large natural lake in North Sumatra , Indonesia, occupying the caldera of the Toba supervolcano . The lake is located in the middle of the northern part of the island of Sumatra, with a surface elevation of about 900 metres (2,953 ft), the lake stretches from 2°53′N 98°31′E  /  2.88°N 98.52°E  / 2.88; 98.52 to 2°21′N 99°06′E  /  2.35°N 99.1°E  / 2.35; 99.1 . The lake

248-716: A lingua franca in the Indonesian archipelago for half a millennium. It might be attributed to its ancestor , the Old Malay language (which can be traced back to the 7th century). The Kedukan Bukit Inscription is the oldest surviving specimen of Old Malay, the language used by Srivijayan empire. Since the 7th century, the Old Malay language has been used in Nusantara (archipelago) (Indonesian archipelago), evidenced by Srivijaya inscriptions and by other inscriptions from coastal areas of

372-740: A lingua franca in the multilingual Indonesian archipelago for centuries. With over 280 million inhabitants, Indonesia ranks as the fourth most populous nation globally. According to the 2020 census, over 97% of Indonesians are fluent in Indonesian, making it the largest language by number of speakers in Southeast Asia and one of the most widely spoken languages in the world. Indonesian vocabulary has been influenced by various regional languages such as Javanese , Sundanese , Minangkabau , Balinese , Banjarese , and Buginese , as well as by foreign languages such as Arabic , Dutch , Portuguese , and English . Many borrowed words have been adapted to fit

496-469: A climate-changing event. Recent advances in dating methods suggest a more accurate identification of 74,000 years ago as the date. It is the largest-known explosive eruption on Earth in the last 25 million years. According to the Toba catastrophe theory , the eruption had global consequences for human populations as it killed most humans living at that time and is believed to have created a population bottleneck in central east Africa and India, which affects

620-454: A few cases, however, coinings permanently replaced earlier Dutch terms, including pajak (earlier meaning 'monopoly') instead of belasting (tax) and senam (meaning 'exercise') instead of gimnastik (gymnastics). The Komisi Bahasa is said to have coined more than 7000 terms, although few of these gained common acceptance. The adoption of Indonesian as the country's national language was in contrast to most other post-colonial states. Neither

744-532: A lack of vegetation that could be due to an eruption within the last few hundred years. Some parts of the caldera have shown uplift due to partial refilling of the magma chamber , for example, pushing Samosir Island and the Uluan Peninsula above the surface of the lake. The lake sediments on Samosir Island show that it has risen by at least 450 m (1,476 ft) since the cataclysmic eruption. Such uplifts are common in very large calderas, apparently due to

868-529: A large part of post-erosional rocks in Tenerife and Gran Canaria islands. Yucca Mountain Repository, a U.S. Department of Energy terminal storage facility for spent nuclear reactor and other radioactive waste, is in a deposit of ignimbrite and tuff. The layering of ignimbrites is used when the stone is worked, as it sometimes splits into convenient slabs, useful for flagstones and in garden edge landscaping. In

992-498: A large proportion of Indonesian, at least, use two language daily, those are Indonesian and local languages. When two languages are used by the same people in this way, they are likely to influence each other. Aside from local languages, Dutch made the highest contribution to the Indonesian vocabulary, due to the Dutch colonization over three centuries, from the 16th century until the mid-20th century. Asian languages also influenced

1116-465: A lingua franca between vernacular Malay dialects, Malay creoles, and regional languages. The Indonesian name for the language ( bahasa Indonesia ) is also occasionally used in English and other languages. Bahasa Indonesia is sometimes improperly reduced to Bahasa , which refers to the Indonesian subject ( Bahasa Indonesia ) taught in schools, on the assumption that this is the name of the language. But

1240-427: A looser sense, it also encompasses the various local varieties spoken throughout the Indonesian archipelago. Standard Indonesian is confined mostly to formal situations, existing in a diglossic relationship with vernacular Malay varieties, which are commonly used for daily communication, coexisting with the aforementioned regional languages and with Malay creoles ; standard Indonesian is spoken in informal speech as

1364-516: A magma chamber containing 50,000 cubic kilometres (12,000 cu mi) of eruptible magma, about 30–50 kilometres (19–31 mi) underground. This makes the supervolcano's magma chamber more than four times larger than the volume of Lake Superior in North America, and also larger than the magma chamber underneath Yellowstone . Lake Toba lies near the Great Sumatran fault , which runs along

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1488-507: A monophthong followed by an approximant, so ⟨ai⟩ represents /aj/ , ⟨au⟩ represents /aw/ , and ⟨oi⟩ represents /oj/ . On this basis, there are no phonological diphthongs in Indonesian. Diphthongs are differentiated from two vowels in two syllables, such as: Ignimbrite Ignimbrites are made of a very poorly sorted mixture of volcanic ash (or tuff when lithified ) and pumice lapilli , commonly with scattered lithic fragments. The ash

1612-414: A plug flow, with an essentially non-deforming mass travelling on a thin shear zone, and the en masse freezing occurs when the driving stress falls below a certain level. This would produce a massive unit with an inversely graded base. There are several problems with the en masse model. Since ignimbrite is a deposit, its characteristics cannot completely represent the flow, and the deposit may only record

1736-598: A result of the southward expansion of Austronesian peoples into Maritime Southeast Asia from the island of Taiwan . Indonesian, which originated from Malay, is a member of the Austronesian family of languages, which includes languages from Southeast Asia , the Pacific Ocean and Madagascar , with a smaller number in continental Asia . It has a degree of mutual intelligibility with the Malaysian standard of Malay, which

1860-613: A rift between the two standardized varieties. This has been based more upon political nuance and the history of their standardization than cultural reasons, and as a result, there are asymmetrical views regarding each other's variety among Malaysians and Indonesians. Malaysians tend to assert that Malaysian and Indonesian are merely different normative varieties of the same language, while Indonesians tend to treat them as separate, albeit closely related, languages. Consequently, Indonesians feel little need to harmonise their language with Malaysia and Brunei, whereas Malaysians are keener to coordinate

1984-461: A significant influence on the development of Malay in the colony: during the colonial era, the language that would be standardized as Indonesian absorbed a large amount of Dutch vocabulary in the form of loanwords . The nationalist movement that ultimately brought Indonesian to its national language status rejected Dutch from the outset. However, the rapid disappearance of Dutch was a very unusual case compared with other colonized countries, where

2108-601: A similar chemistry and so must have undergone the same compaction process to have the same foliation. The Green Tuff in Pantelleria contains rheomorphic structures which are held to be a result of post-depositional re-mobilization because at that time the Green Tuff was believed to be a fall deposit which has no lateral transport. Similarities between the structures in the Green Tuff and ignimbrites on Gran Canaria suggest post-depositional re-mobilization. This interpretation of

2232-560: A system which treats the open-mid vowels / ɛ / and / ɔ / as distinct phonemes. Poedjosoedarmo argued the split of the front mid vowels in Indonesian is due to Javanese influence which exhibits a difference between ⟨i⟩ [ i ], ⟨é⟩ [ e ] and è [ ɛ ]. Another example of Javanese influence in Indonesian is the split of back mid vowels into two allophones of [ o ] and [ ɔ ]. These splits (and loanwords) increase instances of doublets in Indonesian, such as ⟨ satai ⟩ and ⟨ saté ⟩. Javanese words adopted into Indonesian have greatly increased

2356-515: A total number of speakers in Indonesia of 248.5 million. It is common as a first language in urban areas, and as a second language by those residing in more rural parts of Indonesia. The VOA and BBC use Indonesian as their standard for broadcasting in Malay. In Australia , Indonesian is one of three Asian target languages, together with Japanese and Mandarin , taught in some schools as part of

2480-566: A young age of several hundred years. Also, the Pusubukit (Hill Center) volcano (1,971 m (6,467 ft) above sea level) on the south edge of the caldera is solfatarically active. The Toba eruption (the Toba event ) occurred at what is now Lake Toba about 73,700±300 years ago. It was the last in a series of at least four caldera -forming eruptions at this location, with the earlier known caldera having formed around 1.2 million years ago. This last eruption had an estimated VEI of 8, making it

2604-794: Is a standard language of "Riau Malay", which despite its common name is not based on the vernacular Malay dialects of the Riau Islands , but rather represents a form of Classical Malay as used in the 19th and early 20th centuries in the Riau-Lingga Sultanate . Classical Malay had emerged as a literary language in the royal courts along both shores of the Strait of Malacca , including the Johor Sultanate and Malacca Sultanate . Originally spoken in Northeast Sumatra , Malay has been used as

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2728-444: Is a common form of ignimbrite alteration. There are two types of welding, primary and secondary. If the density current is sufficiently hot the particles will agglutinate and weld at the surface of sedimentation to form a viscous fluid; this is primary welding. If during transport and deposition the temperature is low, then the particles will not agglutinate and weld, although welding may occur later if compaction or other factors reduce

2852-424: Is a folk story about the lake, in which once upon a time, there was a fisherman who caught a golden fish. Samosir Island is believed to be the golden fish's son. Indonesian language Indonesian ( Bahasa Indonesia ; [baˈhasa indoˈnesija] ) is the official and national language of Indonesia . It is a standardized variety of Malay , an Austronesian language that has been used as

2976-568: Is about 100 kilometres (62 miles) long, 30 kilometres (19 mi) wide, and up to 505 metres (1,657 ft) deep. It is the largest lake in Indonesia and the largest volcanic lake in the world. Toba Caldera is one of twenty geoparks in Indonesia, and was recognised in July 2020 as one of the UNESCO Global Geoparks . Lake Toba is the site of a supervolcanic eruption estimated at VEI 8 that occurred 69,000 to 77,000 years ago, representing

3100-690: Is also theorized that transformation occurs at a boundary layer at the base of the flow and that all the materials pass through this layer during deposition. Another model proposed is that the density current became stationary before the rheomorphic structures form. Structures such as pervasive foliation are a result of load compaction, and other structures are the result of remobilization by load and deposition on inclined topography. The tuff deposited at Wagontire Mountain in Oregon and Bishop Tuff in California show evidence of late stage viscous flow. These tuffs have

3224-565: Is amplified by the use of Indonesian slang , particularly in the cities. Unlike the relatively uniform standard variety, Vernacular Indonesian exhibits a high degree of geographical variation, though Colloquial Jakartan Indonesian functions as the de facto norm of informal language and is a popular source of influence throughout the archipelago. There is language shift of first language among Indonesian into Indonesian from other language in Indonesia caused by ethnic diversity than urbanicity. The most common and widely used colloquial Indonesian

3348-632: Is composed of glass shards and crystal fragments. Ignimbrites may be loose and unconsolidated, or lithified (solidified) rock called lapilli-tuff. Near the volcanic source, ignimbrites often contain thick accumulations of lithic blocks, and distally, many show meter-thick accumulations of rounded cobbles of pumice. Ignimbrites may be white, grey, pink, beige, brown, or black depending on their composition and density. Many pale ignimbrites are dacitic or rhyolitic . Darker-coloured ignimbrites may be densely welded volcanic glass or, less commonly, mafic in composition. Two main models have been proposed to explain

3472-452: Is currently debate in the field of the relative importance of either mechanism, there is agreement that both mechanisms have an effect. A vertical variation in orientation of the structures is compelling evidence against post-depositional re-mobilization being responsible for the majority of the structures, but more work needs to be carried out to discover if the majority of ignimbrites have these vertical variations in order to say which process

3596-543: Is heavily influenced by the Betawi language , a Malay-based creole of Jakarta , amplified by its popularity in Indonesian popular culture in mass media and Jakarta's status as the national capital. In informal spoken Indonesian, various words are replaced with those of a less formal nature. For example, tidak (no) is often replaced with the Betawi form nggak or the even simpler gak/ga , while seperti (like, similar to)

3720-419: Is named as 'Indonesian language' is a true Malay language derived from 'Riau Malay' but which had been added, modified or subscribed according to the requirements of the new age and nature, until it was then used easily by people across Indonesia; the renewal of Malay language until it became Indonesian it had to be done by the experts of the new nature, the national nature of Indonesia" — Ki Hajar Dewantara in

3844-463: Is now recognized to be the Out-of-Africa founder effect , rather than an actual reduction in population. Since the major eruption ~70,000 years ago, eruptions of smaller magnitude have also occurred at Toba. The small cone of Pusukbukit formed on the southwestern margin of the caldera and lava domes. The most recent eruption may have been at Tandukbenua on the northwestern caldera edge, suggested by

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3968-464: Is officially known there as bahasa Malaysia , despite the numerous lexical differences. However, vernacular varieties spoken in Indonesia and Malaysia share limited intelligibility, which is evidenced by the fact that Malaysians have difficulties understanding Indonesian sinetron (soap opera) aired on Malaysia TV stations, and vice versa. Malagasy , a geographic outlier spoken in Madagascar in

4092-627: Is often replaced with kayak [kajaʔ] . Sangat or amat (very), the term to express intensity, is often replaced with the Javanese-influenced banget . As for pronunciation, the diphthongs ai and au on the end of base words are typically pronounced as /e/ and /o/ . In informal writing, the spelling of words is modified to reflect the actual pronunciation in a way that can be produced with less effort. For example, capai becomes cape or capek , pakai becomes pake , kalau becomes kalo . In verbs,

4216-494: Is perhaps the only language that has achieved the status of a national language in its true sense" since it truly dominates in all spheres of Indonesian society . The ease with which Indonesia eliminated the language of its former colonial power can perhaps be explained as much by Dutch policy as by Indonesian nationalism. In marked contrast to the French , Spanish and Portuguese, who pursued an assimilation colonial policy, or even

4340-522: Is possible that the eruption caused a planet-wide die-off. However, the global cooling has been discussed by Rampino and Self. Their conclusion is that the cooling had already started before Toba's eruption. This conclusion was supported by Lane and Zielinski who studied the lake-core from Africa and GISP2 . They concluded that there was no volcanic winter after the Toba eruption and that high H 2 SO 4 deposits do not cause long-term effects. Furthermore, due to

4464-524: Is the most common. A model based on observations at the Wall Mountain Tuff at Florissant Fossil Beds National Monument in Colorado suggests that the rheomorphic structures such as foliation and pyroclasts were formed during laminar viscous flow as the density current comes to a halt. A change from particulate flow to a viscous fluid could cause the rapid en masse cooling in the last few meters. It

4588-553: The British , the Dutch did not attempt to spread their language among the indigenous population. In fact, they consciously prevented the language from being spread by refusing to provide education, especially in Dutch, to the native Indonesians so they would not come to see themselves as equals. Moreover, the Dutch wished to prevent the Indonesians from elevating their perceived social status by taking on elements of Dutch culture. Thus, until

4712-667: The Indian Ocean , also in some parts of the Sulu area of the southern Philippines and traces of it are to be found among people of Malay descent in Sri Lanka , South Africa , and other places. Indonesian is taught as a foreign language in schools, universities and institutions around the world, especially in Australia , the Netherlands , Japan , South Korea , Timor-Leste , Vietnam , Taiwan ,

4836-544: The Indian Ocean ; the Philippines national language, Filipino ; Formosan in Taiwan's aboriginal population; and the native Māori language of New Zealand are also members of this language family. Although each language of the family is mutually unintelligible, their similarities are rather striking. Many roots have come virtually unchanged from their common ancestor, Proto-Austronesian language . There are many cognates found in

4960-579: The Languages Other Than English programme. Indonesian has been taught in Australian schools and universities since the 1950s. In East Timor , which was occupied by Indonesia between 1975 and 1999, Indonesian is recognized by the constitution as one of the two working languages (the other being English ), alongside the official languages of Tetum and Portuguese . It is understood by the Malay people of Australia's Cocos Keeling Islands in

5084-749: The Sierra Madre Occidental in western Mexico. In the western United States , massive ignimbrite deposits up to several hundred metres thick occur in the Basin and Range Province , largely in Nevada , western Utah , southern Arizona , and north-central and southern New Mexico , and the Snake River Plain . The magmatism in the Basin and Range Province included a massive flare-up of ignimbrite which began about 40 million years ago and largely ended 25 million years ago:

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5208-639: The United States , and the United Kingdom . Indonesian is the official language of Indonesia , and its use is encouraged throughout the Indonesian archipelago. It is regulated in Chapter XV, 1945 Constitution of Indonesia about the flag, official language, coat of arms, and national anthem of Indonesia. Also, in Chapter III, Section 25 to 45, Government regulation No. 24/ 2009 mentions explicitly

5332-453: The University of Illinois at Urbana–Champaign in 1998, the effects of the Toba eruption may have decreased the size of human populations to only a few tens of thousands of individuals. However, this hypothesis is not widely accepted because similar effects on other animal species have not been observed, and paleoanthropology suggests there was no population bottleneck . The genetic bottleneck

5456-557: The 1930s, they maintained a minimalist regime and allowed Malay to spread quickly throughout the archipelago. Dutch dominance at that time covered nearly all aspects, with official forums requiring the use of Dutch, although since the Second Youth Congress (1928) the use of Indonesian as the national language was agreed on as one of the tools in the independence struggle. As of it, Mohammad Hoesni Thamrin inveighed actions underestimating Indonesian. After some criticism and protests,

5580-447: The 2010 census showing only 19.94% of over-five-year-olds speak mainly Indonesian at home. Standard Indonesian is used in books and newspapers and on television/radio news broadcasts. The standard dialect, however, is rarely used in daily conversations, being confined mostly to formal settings. While this is a phenomenon common to most languages in the world (for example, spoken English does not always correspond to its written standards),

5704-416: The 8.7 2005 Nias–Simeulue earthquake , the epicenters of which were around 300 km (190 mi) from Toba. Most of the people who live around Lake Toba are ethnically Bataks . Traditional Batak houses are noted for their distinctive roofs (which curve upwards at each end, as a boat's hull does) and their colorful decor. Parapat is located on the edge of the lake, which is the transit point to travel

5828-491: The Congress of Indonesian Language I 1938, Solo Several years prior to the congress, Swiss linguist, Renward Brandstetter wrote An Introduction to Indonesian Linguistics in 4 essays from 1910 to 1915. The essays were translated into English in 1916. By "Indonesia", he meant the name of the geographical region , and by "Indonesian languages" he meant Malayo-Polynesian languages west of New Guinea, because by that time there

5952-574: The Indonesian language is still in debate. High Malay was the official language used in the court of the Johor Sultanate and continued by the Dutch-administered territory of Riau-Lingga , while Low Malay was commonly used in marketplaces and ports of the archipelago. Some linguists have argued that it was the more common Low Malay that formed the base of the Indonesian language. When the Dutch East India Company (VOC) first arrived in

6076-689: The Toba Caldera eruptions, even at that great distance, but little indication of a significant climatic effect in East Africa. The Toba Caldera in North Sumatra comprises four overlapping volcanic craters that adjoin the Sumatran "volcanic front". At 100 by 30 kilometres (62 by 19 mi) it is the world's largest Quaternary caldera, and the fourth and youngest caldera. It intersects the three older calderas. An estimated 2,800 km (670 cu mi) of dense-rock equivalent pyroclastic material, known as

6200-405: The Toba ash layer today is up to 6 m (20 ft) thick and parts of Malaysia were covered with 9 m (30 ft) of ash fall. The subsequent collapse formed a caldera that filled with water, creating Lake Toba. The island in the center of the lake is formed by a resurgent dome . The exact year of the eruption is unknown, but the pattern of ash deposits suggests that it occurred during

6324-532: The archipelago at the start of the 1600s, the Malay language was a significant trading and political language due to the influence of the Malaccan Sultanate and later the Portuguese . However, the language had never been dominant among the population of the Indonesian archipelago as it was limited to mercantile activity. The VOC adopted the Malay language as the administrative language of their trading outpost in

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6448-415: The archipelago, such as Sojomerto inscription . Trade contacts carried on by various ethnic peoples at the time were the main vehicle for spreading the Old Malay language, which was the main communications medium among the traders. Ultimately, the Old Malay language became a lingua franca and was spoken widely by most people in the archipelago. Indonesian (in its standard form) has essentially

6572-497: The base and top, called lower and upper 'vitrophyres', but central parts are microcrystalline ('lithoidal'). The mineralogy of an ignimbrite is controlled primarily by the chemistry of the source magma. The typical range of phenocrysts in ignimbrites are biotite, quartz, sanidine or other alkali feldspar , occasionally hornblende , rarely pyroxene and in the case of phonolite tuffs, the feldspathoid minerals such as nepheline and leucite . Commonly in most felsic ignimbrites

6696-410: The base of the flow cannot be turbulent . The instantaneous deposition of an entire body of material is not possible because displacement of the fluid is not possible instantaneously. Any displacement of the fluid would mobilize the upper part of the flow, and en masse deposition would not occur. Instantaneously cessation of the flow would cause local compression and extension, which would be evident in

6820-617: The centre of Sumatra in the Sumatra Fracture Zone . The volcanoes of Sumatra and Java are part of the Sunda Arc , a result of the northeasterly movement of the Indo-Australian Plate , which is sliding under the eastward-moving Eurasian Plate . The subduction zone in this area is very active: the seabed near the west coast of Sumatra has had several major earthquakes since 1995, including the 9.1 2004 Indian Ocean earthquake and

6944-427: The colonial language generally has continued to function as the language of politics, bureaucracy , education, technology , and other fields of importance for a significant time after independence. The Indonesian scholar Soenjono Dardjowidjojo  [ id ] even goes so far as to say that when compared to the situation in other Asian countries such as India, Malaysia, Singapore and the Philippines, "Indonesian

7068-411: The density current passed over the forming deposit. Vertical variations in the orientations of sheathfolds are evidence that rheomorphism and welding can occur syn-depositionally. It has been disputed that the shear between the density current and the forming deposit is significant enough to cause all of the rheomorphic structures observed in ignimbrites, although the shear could be responsible for some of

7192-475: The deposition of ignimbrites from a pyroclastic density current: the en masse deposition and the progressive aggradation models. The en masse model was proposed by volcanologist Stephen Sparks in 1976. Sparks attributed the poor sorting in ignimbrites to laminar flows of very high particle concentration. Pyroclastic flows were envisioned as being similar to debris flows, with a body undergoing laminar flow and then stopping en masse . The flow would travel as

7316-424: The deposition of the Green Tuff has been disputed, suggesting that it is an ignimbrite, and structures such as imbricate fiamme , observed in the Green Tuff, were the result of late stage primary viscous flow. Similar structures observed on Gran Canaria had been interpreted as syn-depositional flow. Sheathfolds and other rheomorphic structures may be the result of a single stage of shear. Shear possibly occurred as

7440-409: The depositional process. Vertical chemical zonation in ignimbrites is interpreted as recording incremental changes in the deposition, and the zonation rarely correlates with flow unit boundaries and may occur within flow units. It has been posited that the chemical changes are recording progressive aggradation at the base of the flow from an eruption whose composition changes with time. For this to be so,

7564-485: The development of national culture, science, technology, and mass media. It also serves as a vehicle of communication among the provinces and different regional cultures in the country. According to Indonesian law, the Indonesian language was proclaimed as the unifying language during the Youth Pledge on 28 October 1928 and developed further to accommodate the dynamics of Indonesian civilization. As mentioned previously,

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7688-517: The early European traders and explorers brought to Southeast Asia. Indonesian also receives many English words as a result of globalization and modernization , especially since the 1990s, as far as the Internet's emergence and development until the present day. Some Indonesian words correspond to Malay loanwords in English, among them the common words orangutan , gong , bamboo , rattan , sarong , and

7812-557: The east. Following the bankruptcy of the VOC, the Batavian Republic took control of the colony in 1799, and it was only then that education in and promotion of Dutch began in the colony . Even then, Dutch administrators were remarkably reluctant to promote the use of Dutch compared to other colonial regimes. Dutch thus remained the language of a small elite: in 1940, only 2% of the total population could speak Dutch. Nevertheless, it did have

7936-449: The edges of the ancient Waikato River course which flowed through the valley before the last major Taupō eruption 1,800 years ago (the Hatepe eruption ). The west cliffs are quarried to get blocks of Hinuera Stone, the name given to welded ignimbrite used for building cladding. The stone is light grey with traces of green and is slightly porous. Huge deposits of ignimbrite form large parts of

8060-606: The evolution of the language with Indonesians, although the 1972 Indonesian alphabet reform was seen mainly as a concession of Dutch-based Indonesian to the English-based spelling of Malaysian. In November 2023, the Indonesian language was recognised as one of the official languages of the UNESCO General Conference. Currently there are 10 official languages of the UNESCO General Conference, consisting of

8184-567: The form of tension cracks and small scale thrusting, which is not seen in most ignimbrites. An adaptation of the en masse theory suggests that the ignimbrite records progressive aggradation from a sustained current and that the differences observed between ignimbrites and within an ignimbrite are the result of temporal changes to the nature of the flow that deposited it. Rheomorphic structures are only observed in high grade ignimbrites. There are two types of rheomorphic flow; post-depositional re-mobilization, and late stage viscous flow. While there

8308-464: The frequency of Indonesian ⟨é⟩ and ⟨o⟩. In traditional Malay, high vowels (⟨i⟩, ⟨u⟩) could not appear in a final syllable if a mid-vowel (⟨e⟩, ⟨o⟩) appeared in the previous syllable, and conversely, mid-vowels (⟨e⟩, ⟨o⟩) could not appear in the final syllable if a high vowel (⟨i⟩, ⟨u⟩) appeared in the previous syllable. Traditional Malay does not allow the mid-central schwa vowel to occur in consonant open or closed word-final syllables. The schwa vowel

8432-794: The future president and vice-president, Sukarno and Hatta. Journalists, beginning a practice that has continued to the present, did not wait for the Komisi Bahasa to provide new words, but actively participated themselves in coining terms. Many of the Komisi Bahasa's terms never found public acceptance and after the Japanese period were replaced by the original Dutch forms, including jantera (Sanskrit for 'wheel'), which temporarily replaced mesin (machine), ketua negara (literally 'chairman of state'), which had replaced presiden (president) and kilang (meaning 'mill'), which had replaced pabrik (factory). In

8556-570: The genetic make-up of the human worldwide population to the present. A recent study has cast doubt on this theory and found no evidence of substantial changes in global population. It was also suggested that the eruption of the Toba Caldera led to a volcanic winter with a worldwide decrease in temperature between 3 and 5 °C (5.4 and 9.0 °F), and up to 15 °C (27 °F) in higher latitudes. Additional studies in Lake Malawi in East Africa show significant amounts of ash being deposited from

8680-484: The ignimbrites, like all felsic rocks, and the resultant mineralogy of phenocryst populations within them, is related mostly to the varying contents of sodium, potassium, calcium, the lesser amounts of iron and magnesium. Some rare ignimbrites are andesitic, and may even be formed from volatile saturated basalt , where the ignimbrite would have the geochemistry of a normal basalt. Large hot ignimbrites can create some form of hydrothermal activity as they tend to blanket

8804-486: The lake and Samosir Island . Medan is about 173 km by road from the town and is connected via the Trans-Sumatran Highway to Pematang Siantar by a 48 km road. Sisingamangaraja XII International Airport is located about 47 mi (76 km) from Parapat. The flora of the lake includes various types of phytoplankton , emerged macrophytes , floating macrophytes, and submerged macrophytes, while

8928-733: The lake) and Neolissochilus thienemanni , locally known as the Batak fish. The latter species is threatened by deforestation (causing siltation ), pollution, changes in water level and the numerous fish species that have been introduced to the lake. Other native fishes include species such as Aplocheilus panchax , Nemacheilus pfeifferae , Homaloptera gymnogaster , Channa gachua , Channa striata , Clarias batrachus , Barbonymus gonionotus , Barbonymus schwanenfeldii , Danio albolineatus , Osteochilus vittatus , Puntius binotatus , Rasbora jacobsoni , Tor tambra , Betta imbellis , Betta taeniata and Monopterus albus . Among

9052-451: The land surface. More rarely, clasts are cognate material from the magma chamber. If sufficiently hot when deposited, the particles in an ignimbrite may weld together, and the deposit is transformed into a 'welded ignimbrite' , made of eutaxitic lapilli-tuff . When this happens, the pumice lapilli commonly flatten, and these appear on rock surfaces as dark lens shapes, known as fiamme . Intensely welded ignimbrite may have glassy zones near

9176-1346: The language and established bahasa Indonesia as the national language of the new nation. The term bahasa Indonesia itself had been proposed by Mohammad Tabrani in 1926, and Tabrani had further proposed the term over calling the language Malay language during the First Youth Congress in 1926. Indonesian language (old VOS spelling): Jang dinamakan 'Bahasa Indonesia' jaitoe bahasa Melajoe jang soenggoehpoen pokoknja berasal dari 'Melajoe Riaoe' akan tetapi jang soedah ditambah, dioebah ataoe dikoerangi menoeroet keperloean zaman dan alam baharoe, hingga bahasa itoe laloe moedah dipakai oleh rakjat diseloeroeh Indonesia; pembaharoean bahasa Melajoe hingga menjadi bahasa Indonesia itoe haroes dilakoekan oleh kaoem ahli jang beralam baharoe, ialah alam kebangsaan Indonesia Indonesian (modern EYD spelling): Yang dinamakan 'Bahasa Indonesia' yaitu bahasa Melayu yang sungguhpun pokoknya berasal dari 'Melayu Riau' akan tetapi yang sudah ditambah, diubah atau dikurangi menurut keperluan zaman dan alam baru, hingga bahasa itu lalu mudah dipakai oleh rakyat di seluruh Indonesia; pembaharuan bahasa Melayu hingga menjadi bahasa Indonesia itu harus dilakukan oleh kaum ahli yang beralam baru, ialah alam kebangsaan Indonesia English : "What

9300-412: The language of politics , education , and nation-building in general, Indonesian became one of the few success stories of an indigenous language effectively overtaking that of a country's colonisers to become the de jure and de facto official language. Today, Indonesian continues to function as the language of national identity as the Congress of Indonesian Youth envisioned, and also serves as

9424-432: The language of education, literacy , modernization , and social mobility . Despite still being a second language to most Indonesians, it is unquestionably the language of the Indonesian nation as a whole, as it has had unrivalled success as a factor in nation-building and the strengthening of Indonesian identity. Indonesian is spoken as a mother tongue and national language. Over 200 million people regularly make use of

9548-603: The language was based on Riau Malay, though linguists note that this is not the local dialect of Riau, but the Malaccan dialect that was used in the Riau court . Since its conception in 1928 and its official recognition in the 1945 Constitution, the Indonesian language has been loaded with a nationalist political agenda to unify Indonesia (former Dutch East Indies ). This status has made it relatively open to accommodate influences from other Indonesian ethnic languages, most notably Javanese as

9672-481: The language with the most native speakers (Javanese) nor the language of the former European colonial power (Dutch) was to be adopted. Instead, a local language with far fewer native speakers than the most widely spoken local language was chosen (nevertheless, Malay was the second most widely spoken language in the colony after Javanese, and had many L2 speakers using it for trade, administration, and education). In 1945, when Indonesia declared its independence, Indonesian

9796-465: The language's wordstock. The Japanese agreed to the establishment of the Komisi Bahasa (Language Commission) in October 1942, formally headed by three Japanese but with a number of prominent Indonesian intellectuals playing the major part in its activities. Soewandi, later to be Minister of Education and Culture, was appointed secretary, Alisjahbana was appointed an 'expert secretary' and other members included

9920-417: The language, with Chinese influencing Indonesian during the 15th and 16th centuries due to the spice trade ; Sanskrit , Tamil , Prakrit and Hindi contributing during the flourishing of Hindu and Buddhist kingdoms from the 2nd to the 14th century; followed by Arabic after the spread of Islam in the archipelago in the 13th century. Loanwords from Portuguese were mainly connected with articles that

10044-619: The languages' words for kinship, health, body parts and common animals. Numbers, especially, show remarkable similarities. There are more than 700 local languages in Indonesian islands, such as Javanese , Sundanese , etc. While Malay as the source of Indonesian is the mother tongue of ethnic Malay who lives along the east coast of Sumatra, in the Riau Archipelago, and on the south and west coast of Kalimantan (Borneo). There are several areas, such as Jakarta, Manado, Lesser Sunda islands, and Mollucas which has Malay-based trade languages. Thus,

10168-479: The largest-known explosive volcanic eruption in the Quaternary. Bill Rose and Craig Chesner of Michigan Technological University have estimated that the total amount of material released in the eruption was at least 2,800 km (670 cu mi)—about 2,000 km (480 cu mi) of ignimbrite that flowed over the ground, and approximately 800 km (190 cu mi) that fell as ash mostly to

10292-410: The less common words such as paddy , sago and kapok , all of which were inherited in Indonesian from Malay but borrowed from Malay in English. The phrase "to run amok" comes from the Malay verb amuk (to run out of control, to rage). Indonesian is neither a pidgin nor a creole since its characteristics do not meet any of the criteria for either. It is believed that the Indonesian language

10416-572: The likelihood of the Malay homeland being in western Borneo stretching to the Bruneian coast. A form known as Proto-Malay language was spoken in Borneo at least by 1000 BCE and was, it has been argued, the ancestral language of all subsequent Malayan languages . Its ancestor, Proto-Malayo-Polynesian , a descendant of the Proto-Austronesian language , began to break up by at least 2000 BCE, possibly as

10540-406: The low solubility of sulfur in the magma, the emission of volatiles and climate impacts are likely limited. Evidence from studies of mitochondrial DNA suggests that humans may have passed through a genetic bottleneck around this time that reduced genetic diversity below what would be expected given the age of the species. According to the Toba catastrophe theory, proposed by Stanley H. Ambrose of

10664-567: The magmatism followed the end of the Laramide orogeny , when deformation and magmatism occurred far east of the plate boundary. Additional eruptions of ignimbrite continued in Nevada until roughly 14 million years ago. Individual eruptions were often enormous, sometimes up to thousands of cubic kilometres in volume, giving them a Volcanic Explosivity Index of 8, comparable to Yellowstone Caldera and Lake Toba eruptions. Successions of ignimbrites make up

10788-530: The majority ethnic group, and Dutch as the previous coloniser. Compared to the indigenous dialects of Malay spoken in Sumatra and Malay peninsula or the normative Malaysian standard, the Indonesian language differs profoundly by a large number of Javanese loanwords incorporated into its already-rich vocabulary. As a result, Indonesian has more extensive sources of loanwords , compared to Malaysian Malay. The disparate evolution of Indonesian and Malaysian has led to

10912-460: The majority of the population and that would not divide the nation by favouring one ethnic group, namely the Javanese, over the others. In 1945, Indonesian was already in widespread use; in fact, it had been for roughly a thousand years. Over that long period, Malay, which would later become standardized as Indonesian, was the primary language of commerce and travel . It was also the language used for

11036-415: The many introduced species are Anabas testudineus , Oreochromis mossambicus , Oreochromis niloticus , Ctenopharyngodon idella , Cyprinus carpio , Osphronemus goramy , Trichogaster pectoralis , Trichopodus trichopterus , Poecilia reticulata and Xiphophorus hellerii . On 18 June 2018, Lake Toba was the scene of a ferry disaster , in which over 160 people drowned. MV Sinar Bangun

11160-458: The mid-front vowel /e/ is sometimes represented with a diacritic as ⟨é⟩ to distinguish it from the mid-central vowel ⟨ê⟩ /ə/. Since 2015, the auxiliary graphemes ⟨é⟩ and ⟨è⟩ are used respectively for phonetic [ e ] and [ ɛ ] in Indonesian, while Standard Malay has rendered both of them as ⟨é⟩. The phonetic realization of the mid vowels / e / and / o / ranges from close-mid ( [e] / [o] ) to open-mid ( [ɛ] / [ɔ] ) allophones . Some analyses set up

11284-951: The minimum welding temperature to below the temperature of the glassy particles; this is secondary welding. This secondary welding is most common and suggests that the temperature of most pyroclastic density currents is below the softening point of the particles. The factor that determines whether an ignimbrite has primary welding, secondary welding or no welding is debated: Landscapes formed by erosion in hardened ignimbrite can be remarkably similar to those formed on granitic rocks . In Sierra de Lihuel Calel , La Pampa Province , Argentina, various landforms typical of granites can be observed in ignimbrite. These landforms are inselbergs , flared slopes , domes , nubbins , tors , tafonis and gnammas . In addition, just like in granite landscapes landforms in ignimbrites may be influenced by joint systems . Ignimbrites occur worldwide associated with many volcanic provinces having high-silica content magma and

11408-414: The more classical School Malay and it was accused of publishing Dutch written with an Indonesian vocabulary. Alisjahbana would no doubt have taken the criticism as a demonstration of his success. To him the language of Pujangga Baru pointed the way to the future, to an elaborated, Westernised language able to express all the concepts of the modern world. As an example, among the many innovations they condemned

11532-430: The national language, with varying degrees of proficiency. In a nation that is home to more than 700 native languages and a vast array of ethnic groups, it plays an important unifying and cross-archipelagic role for the country. Use of the national language is abundant in the media, government bodies, schools , universities , workplaces , among members of the upper-class or nobility and also in formal situations, despite

11656-408: The need to develop Indonesian so that it could take its place as a fully adequate national language, able to replace Dutch as a means of entry into modern international culture. In 1933, he began the magazine Pujangga Baru (New Writer — Poedjangga Baroe in the original spelling) with co-editors Amir Hamzah and Armijn Pane. The language of Pujangga Baru came in for criticism from those associated with

11780-530: The northern summer because only the summer monsoon could have deposited Toba ashfall in the South China Sea. The eruption lasted perhaps two weeks, and the ensuing volcanic winter resulted in a decrease in average global temperatures by 3.0 to 3.5 °C (5 to 6 °F) for several years. Ice cores from Greenland record a pulse of starkly reduced levels of organic carbon sequestration . Very few plants or animals in southeast Asia would have survived, and it

11904-616: The phonetic and grammatical rules of Indonesian, enriching the language and reflecting Indonesia's diverse linguistic heritage. Most Indonesians, aside from speaking the national language, are fluent in at least one of the more than 700 indigenous local languages ; examples include Javanese and Sundanese , which are commonly used at home and within the local community. However, most formal education and nearly all national mass media , governance , administration , and judiciary and other forms of communication are conducted in Indonesian. Under Indonesian rule from 1976 to 1999, Indonesian

12028-523: The prefix me- is often dropped, although an initial nasal consonant is often retained, as when mengangkat becomes ngangkat (the basic word is angkat ). The suffixes -kan and -i are often replaced by -in . For example, mencarikan becomes nyariin , menuruti becomes nurutin . The latter grammatical aspect is one often closely related to the Indonesian spoken in Jakarta and its surrounding areas. Malay historical linguists agree on

12152-589: The process the materials that made up this mixture fused together into a very tough rock of medium density. Ignimbrite also occurs in the Coromandel region of New Zealand , where the striking orange-brown ignimbrite cliffs form a distinctive feature of the landscape. The nearby Taupō Volcanic Zone is covered in extensive flat sheets of ignimbrite erupted from caldera volcanoes during the Pleistocene and Holocene. The exposed ignimbrite cliffs at Hinuera (Waikato) mark

12276-417: The propagation of Islam in the 13th to 17th centuries, as well as the language of instruction used by Portuguese and Dutch missionaries attempting to convert the indigenous people to Christianity . The combination of these factors meant that the language was already known to some degree by most of the population, and it could be more easily adopted as the national language than perhaps any other. Moreover, it

12400-436: The proximity of spoken Indonesian (in terms of grammar and vocabulary) to its normative form is noticeably low. This is mostly due to Indonesians combining aspects of their own local languages (e.g., Javanese , Sundanese , and Balinese ) with Indonesian. This results in various vernacular varieties of Indonesian, the very types that a foreigner is most likely to hear upon arriving in any Indonesian city or town. This phenomenon

12524-500: The quartz polymorphs cristobalite and tridymite are usually found within the welded tuffs and breccias . In the majority of cases, it appears that these high-temperature polymorphs of quartz occurred post-eruption as part of an autogenic post-eruptive alteration in some metastable form. Thus although tridymite and cristobalite are common minerals in ignimbrites, they may not be primary magmatic minerals. Most ignimbrites are silicic, with generally over 65% SiO 2 . The chemistry of

12648-620: The resulting explosive eruptions. Ignimbrite occurs very commonly around the lower Hunter Region of the Australian state of New South Wales . The ignimbrite quarried in the Hunter region at locations such as Martins Creek, Brandy Hill, Seaham ( Boral ) and at abandoned quarry at Raymond Terrace is a volcanic sedimentation rock of Carboniferous age (280–345 million years). It had an extremely violent origin. This material built up to considerable depth and must have taken years to cool down completely. In

12772-543: The same material basis as the Malaysian standard of Malay and is therefore considered to be a variety of the pluricentric Malay language. However, it does differ from Malaysian Malay in several respects, with differences in pronunciation and vocabulary. These differences are due mainly to the Dutch and Javanese influences on Indonesian. Indonesian was also influenced by the Melayu pasar ( lit.   ' market Malay ' ), which

12896-820: The six United Nations languages, namely English , French , Arabic , Chinese , Russian , and Spanish , as well as four other languages of UNESCO member countries, namely Hindi , Italian , Portuguese , and Indonesian. As regulated by Indonesian state law UU No 24/2009, other than state official speeches and documents between or issued to Indonesian government, Indonesian language is required by law to be used in: However, other languages may be used in dual-language setting to accompany but not to replace Indonesian language in: agreements, information regarding goods / services, scientific papers, information through mass media, geographical names, public signs, road signs, public facilities, banners, and other information of public services in public area. While there are no sanctions of

13020-430: The status of the Indonesian language. The national language is Indonesian. Indonesian functions as a symbol of national identity and pride, and is a lingua franca among the diverse ethnic groups in Indonesia and the speakers of vernacular Malay dialects and Malay creoles. The Indonesian language serves as the national and official language, the language of education, communication, transaction and trade documentation,

13144-661: The structures such as imbricate fiamme. Ignimbrite is primarily composed of a matrix of volcanic ash ( tephra ) which is composed of shards and fragments of volcanic glass, pumice fragments, and crystals. The crystal fragments are commonly blown apart by the explosive eruption. Most are phenocrysts that grew in the magma, but some may be exotic crystals such as xenocrysts , derived from other magmas, igneous rocks, or from country rock . The ash matrix typically contains varying amounts of pea- to cobble-sized rock fragments called lithic inclusions. They are mostly bits of older solidified volcanic debris entrained from conduit walls or from

13268-431: The surrounding countryside is rainforest including areas of Sumatran tropical pine forests on the higher mountainsides. The fauna includes several species of zooplankton and benthic animals. Since the lake is oligotrophic (nutrient-poor), the native fish fauna is relatively scarce, and the only endemics are Rasbora tobana (strictly speaking near-endemic, since also found in some tributary rivers that run into

13392-459: The upward pressure of below-ground magma . Toba is probably the largest resurgent caldera on Earth. Large earthquakes have recently occurred in the vicinity of the volcano, notably in 1987 along the southern shore of the lake at a depth of 11 km (6.8 mi). Such earthquakes have also been recorded in 1892, 1916, and 1920–1922. In 2016, a study revealed that the Toba Supervolcano has

13516-481: The use of Indonesian was allowed since the Volksraad sessions held in July 1938. By the time they tried to counter the spread of Malay by teaching Dutch to the natives, it was too late, and in 1942, the Japanese conquered Indonesia. The Japanese mandated that all official business be conducted in Indonesian and quickly outlawed the use of the Dutch language. Three years later, the Indonesians themselves formally abolished

13640-525: The uses of other languages, in Indonesian court's point of view, any agreements made in Indonesia but not drafted in Indonesian language, is null and void. In any different interpretations in dual-language agreements setting, Indonesian language shall prevail. Indonesian has six vowel phonemes as shown in the table below. In standard Indonesian orthography, the Latin alphabet is used, and five vowels are distinguished: a, i, u, e, o . In materials for learners,

13764-486: The west. However, as more outcrops become available, Toba possibly erupted 3,200 km (770 cu mi) of ignimbrite and co-ignimbrite. The pyroclastic flows of the eruption destroyed an area of least 20,000 km (7,700 sq mi), with ash deposits as thick as 600 m (2,000 ft) by the main vent. The eruption was large enough to have deposited an ash layer approximately 15 cm (6 in) thick over all of South Asia ; at one site in central India,

13888-469: The wet soil and bury watercourses and rivers. The water from such substrates will exit the ignimbrite blanket in fumaroles , geysers and the like, a process which may take several years, for example after the Novarupta tuff eruption. In the process of boiling off this water, the ignimbrite layer may become metasomatised (altered). This tends to form chimneys and pockets of kaolin -altered rock. Welding

14012-422: The word bahasa only means language. For example, French language is translated as bahasa Prancis , and the same applies to other languages, such as bahasa Inggris (English), bahasa Jepang (Japanese), bahasa Arab (Arabic), bahasa Italia (Italian), and so on. Indonesians generally may not recognize the name Bahasa alone when it refers to their national language. Standard Indonesian

14136-447: The youngest Toba tuff , was released during one of the largest explosive volcanic eruptions in recent geological history. Following this eruption, a resurgent dome formed within the new caldera, joining two half-domes separated by a longitudinal graben . At least four cones, four stratovolcanoes , and three craters are visible in the lake. The Tandukbenua cone on the northwestern edge of the caldera has only sparse vegetation, suggesting

14260-413: Was an irregular operating vessel on the lake which capsized with many passengers on board. The incident caused the death of 167 people and injuries to a number of others. Preliminary reports found the vessel was in operation with irregularities. Ignoring overloading on the vessel and operating in rough weather conditions were concluded to be the main reasons leading to the disaster. The Origin of Lake Toba

14384-403: Was designated as the official language of Timor Leste . It has the status of a working language under the country's constitution along with English . In November 2023, the Indonesian language was recognized as one of the official languages of the UNESCO General Conference. The term Indonesian is primarily associated with the national standard dialect ( bahasa baku ). However, in

14508-436: Was formally declared the national language, despite being the native language of only about 5% of the population. In contrast, Javanese and Sundanese were the mother tongues of 42–48% and 15% respectively. The combination of nationalistic , political , and practical concerns ultimately led to the successful adoption of Indonesian as a national language. In 1945, Javanese was easily the most prominent language in Indonesia. It

14632-600: Was introduced in closed syllables under the influence of Javanese and Jakarta Malay, but Dutch borrowings made it more acceptable. Although Alisjahbana argued against it, insisting on writing ⟨a⟩ instead of an ⟨ê⟩ in final syllables such as koda (vs kodə 'code') and nasionalisma (vs nasionalismə 'nationalism'), he was unsuccessful. This spelling convention was instead survived in Balinese orthography. Indonesian has four diphthong phonemes only in open syllables. They are: Some analyses assume that these diphthongs are actually

14756-456: Was one of the means to achieve independence, but it is opened to receive vocabulary from other foreign languages aside from Malay that it has made contact with since the colonialism era, such as Dutch, English and Arabic among others, as the loan words keep increasing each year. In 2020, Indonesian had 71.9 million native speakers and 176.5 million second-language speakers, who speak it alongside their local mother tongue , giving

14880-400: Was still no notion of Indonesian language. Sutan Takdir Alisjahbana was a great promoter of the use and development of Indonesian and he was greatly exaggerating the decline of Dutch. Higher education was still in Dutch and many educated Indonesians were writing and speaking in Dutch in many situations (and were still doing so well after independence was achieved). He believed passionately in

15004-440: Was the language of the sultanate of Brunei and of future Malaysia , on which some Indonesian nationalists had claims . Over the first 53 years of Indonesian independence , the country's first two presidents, Sukarno and Suharto constantly nurtured the sense of national unity embodied by Indonesian, and the language remains an essential component of Indonesian identity. Through a language planning program that made Indonesian

15128-407: Was the lingua franca of the archipelago in colonial times, and thus indirectly by other spoken languages of the islands. Malaysian Malay claims to be closer to the classical Malay of earlier centuries, even though modern Malaysian has been heavily influenced, in lexicon as well as in syntax, by English. The question of whether High Malay (Court Malay) or Low Malay (Bazaar Malay) was the true parent of

15252-445: Was the native language of nearly half the population, the primary language of politics and economics , and the language of courtly , religious , and literary tradition. What it lacked, however, was the ability to unite the diverse Indonesian population as a whole. With thousands of islands and hundreds of different languages, the newly independent country of Indonesia had to find a national language that could realistically be spoken by

15376-649: Was use of the word bisa instead of dapat for 'can'. In Malay bisa meant only 'poison from an animal's bite' and the increasing use of Javanese bisa in the new meaning they regarded as one of the many threats to the language's purity. Unlike more traditional intellectuals, he did not look to Classical Malay and the past. For him, Indonesian was a new concept; a new beginning was needed and he looked to Western civilisation, with its dynamic society of individuals freed from traditional fetters, as his inspiration. The prohibition on use of Dutch led to an expansion of Indonesian language newspapers and pressure on them to increase

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