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100-402: A creeping dune on the western edge of town is advancing on the city, cutting In Salah in half. The dune is moving at a speed of approximately one meter (three feet) every five years. As buildings are covered by its leading edge, structures at the back of the dune are being gradually uncovered. When a formerly covered location at the back of the dune once again becomes free, it is established who

200-596: A broad variety of universities, colleges and academies. Founded in 1088, the University of Bologna is likely the oldest in the world . In 2009, the University of Bologna is, according to The Times , the only Italian college in the top 200 World Universities. Milan's Bocconi University has been ranked among the top 20 best business schools in the world by The Wall Street Journal international rankings, especially thanks to its M.B.A. program, which in 2007 placed it no. 17 in

300-489: A broad-spectrum view of tertiary education and detailed information on the nation's educational structure, accreditation procedures, and connections to state as well as federal agencies and entities. The Carnegie Classification of Institutions of Higher Education provides one framework for classifying U.S. colleges and universities in several different ways. US tertiary education also includes various non-profit organizations promoting professional development of individuals in

400-555: A dune forms, plant succession occurs. The conditions on an embryo dune are harsh, with salt spray from the sea carried on strong winds. The dune is well drained and often dry, and composed of calcium carbonate from seashells. Rotting seaweed , brought in by storm waves adds nutrients to allow pioneer species to colonize the dune. For example, in the United Kingdom these pioneer species are often marram grass , sea wort grass and other sea grasses. These plants are well adapted to

500-590: A few tens of metres except at their nose, where vegetation stops or slows the advance of accumulating sand. Simple parabolic dunes have only one set of arms that trail upwind, behind the leading nose. Compound parabolic dunes are coalesced features with several sets of trailing arms. Complex parabolic dunes include subsidiary superposed or coalesced forms, usually of barchanoid or linear shapes. Parabolic dunes, like crescent dunes, occur in areas where very strong winds are mostly unidirectional. Although these dunes are found in areas now characterized by variable wind speeds,

600-429: A key role in ensuring institutions meet minimum standards. It is large and diverse with institutions that are privately governed and institutions that are owned and operated by state and local governments. Some private institutions are affiliated with religious organizations whereas others are secular with enrollment ranging from a few dozen to tens of thousands of students. The United States Department of Education presents

700-407: A low-lying pan within the basin where the water evaporates, depositing the gypsum and forming crystals known as selenite . The crystals left behind by this process are eroded by the wind and deposited as vast white dune fields that resemble snow-covered landscapes. These types of dune are rare, and only form in closed arid basins that retain the highly soluble gypsum that would otherwise be washed into

800-472: A nondegree level is sometimes referred to as further education or continuing education as distinct from higher education. Higher education includes teaching, research, exacting applied work, as exists in medical schools and dental schools , and social services activities of universities. Within the realm of teaching, it includes both the undergraduate level, and beyond that, graduate-level (or postgraduate level). The latter level of education

900-528: A prestigious group of twenty research-intensive European Universities. It has also been awarded ranking positions such as 1st in Italy and 7th in Europe (The Leiden Ranking – Universiteit Leiden). Tertiary education refers to post-secondary education received at universities (government or privately funded), monotechnics, polytechnics and colleges of education. After completing a secondary education, students may enroll in

1000-412: A significant role in minimizing wave energy as it moves onshore. As a result, coastal dunes, especially those in the foredune area affected by a storm surge , will retreat or erode. To counteract the damage from tropical activity on coastal dunes, short term post-storm efforts can be made by individual agencies through fencing to help with sand accumulation. How much a dune erodes during any storm surge

1100-462: A star dune superimposed on its crest is the most common complex dune. Simple dunes represent a wind regime that has not changed in intensity or direction since the formation of the dune, while compound and complex dunes suggest that the intensity and direction of the wind has changed. The sand mass of dunes can move either windward or leeward, depending on if the wind is making contact with the dune from below or above its apogee. If wind hits from above,

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1200-485: A student may go to university, but may also stop at that point. Education in Italy is compulsory from 6 to 16 years of age, and is divided into five stages: kindergarten ( scuola dell'infanzia ), primary school ( scuola primaria or scuola elementare ), lower secondary school ( scuola secondaria di primo grado or scuola media inferiore ), upper secondary school ( scuola secondaria di secondo grado or scuola media superiore ) and university ( università ). Education

1300-804: A unidirectional wind. In the sheltered troughs between highly developed seif dunes, barchans may be formed, because the wind is constrained to be unidirectional by the dunes. Seif dunes are common in the Sahara. They range up to 300 m (980 ft) in height and 300 km (190 mi) in length. In the southern third of the Arabian Peninsula, a vast erg , called the Rub' al Khali or Empty Quarter, contains seif dunes that stretch for almost 200 km (120 mi) and reach heights of over 300 m (980 ft). Linear loess hills known as pahas are superficially similar. These hills appear to have been formed during

1400-493: A wide knowledge of liberal arts and sciences. The Lisbon Recognition Convention stipulates that degrees and periods of study must be recognised in all of the Signatory Parties of the convention. The oldest known institutions of higher education are credited to Dynastic Egypt, with Pr-Anx (houses of life) built as libraries and scriptoriums, containing works on law, architecture, mathematics, and medicine, and involved in

1500-449: Is a landform composed of wind- or water-driven sand . It typically takes the form of a mound, ridge, or hill. An area with dunes is called a dune system or a dune complex . A large dune complex is called a dune field , while broad, flat regions covered with wind-swept sand or dunes, with little or no vegetation, are called ergs or sand seas . Dunes occur in different shapes and sizes, but most kinds of dunes are longer on

1600-477: Is a type of sandstone that is formed when a marine or aeolian sand dune becomes compacted and hardened. Once in this form, water passing through the rock can carry and deposit minerals, which can alter the colour of the rock. Cross-bedded layers of stacks of lithified dunes can produce the cross-hatching patterns, such as those seen in Zion National Park in the western United States. A slang term, used in

1700-442: Is a very large aeolian landform, with a length of several kilometers and a height of tens to hundreds of meters, and which may have superimposed dunes. Dunes are made of sand-sized particles, and may consist of quartz, calcium carbonate, snow, gypsum, or other materials. The upwind/upstream/upcurrent side of the dune is called the stoss side; the downflow side is called the lee side. Sand is pushed (creep) or bounces ( saltation ) up

1800-410: Is blown along the beach. Dunes form where the beach is wide enough to allow for the accumulation of wind-blown sand, and where prevailing onshore winds tend to blow sand inland. The three key ingredients for coastal dune formation are a large sand supply, winds to move said sand supply, and a place for the sand supply to accumulate. Obstacles—for example, vegetation, pebbles and so on—tend to slow down

1900-445: Is by saltation , where sand particles skip along the ground like a bouncing ball . When these skipping particles land, they may knock into other particles and cause them to move as well, in a process known as creep . With slightly stronger winds, particles collide in mid-air, causing sheet flows . In a major dust storm , dunes may move tens of metres through such sheet flows. Also as in the case of snow, sand avalanches , falling down

2000-657: Is by no means unknown but the days are pleasantly warm, sunny and dry. In Salah has recorded at least 35 °C (95 °F) in every month of the year including January and December as the absolute records high temperatures are respectively 35 °C (95 °F) and 36 °C (97 °F) for these two months. The absolute records low temperatures are below the freezing point, with −4 °C (25 °F) recorded in January and −1 °C (30 °F) recorded in both February and December, although freezing temperatures are very rare and don't occur each year. Average annual relative humidity

2100-428: Is due to a number of pressures related to their proximity to the ocean and confinement to growth on sandy substrates. These include: Plants have evolved many adaptations to cope with these pressures: In deserts where large amounts of limestone mountains surround a closed basin , such as at White Sands National Park in south-central New Mexico , occasional storm runoff transports dissolved limestone and gypsum into

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2200-419: Is free in Italy and free education is available to children of all nationalities who are residents in Italy. Italy has both a private and public education system. Italy has a large and international network of public or state-affiliated universities and schools offering degrees in higher education. State-run universities of Italy constitute the main percentage of tertiary education in Italy and are managed under

2300-424: Is low with only 24%. The sky is clear all year and cloudy days are very rare. Thereby, the solar irradiation is among the highest found on the planet and the annual sunshine duration is estimated between 3,700 h and 4,000 h. In Salah is often quoted as one of the hottest spots worldwide. With Adrar and Reggane , In Salah forms the "Triangle of Fire" as local inhabitants say due to the extreme desert heat that bakes

2400-614: Is monitored through the global indicator for target 4.3 in the sustainable development goal 4 (SDG 4), which measures the participation rate of youth and adults in formal and non-formal education and training in the previous 12 months, whether for work or non-work purposes. The right of access to higher education is mentioned in a number of international human rights instruments . The UN International Covenant on Economic, Social and Cultural Rights of 1966 declares, in Article 13, that "higher education shall be made equally accessible to all, on

2500-471: Is often referred to as graduate school , especially in North America. In addition to the skills that are specific to any particular degree, potential employers in any profession are looking for evidence of critical thinking and analytical reasoning skills, teamworking skills, information literacy , ethical judgment, decision-making skills, fluency in speaking and writing, problem solving skills, and

2600-404: Is related to its location on the coastal shoreline and the profile of the beach during a particular season. In those areas with harsher winter weather, during the summer a beach tends to take on more of a convex appearance due to gentler waves, while the same beach in the winter may take on more of a concave appearance. As a result, coastal dunes can get eroded much more quickly in the winter than in

2700-671: Is shown in the following table. The percentage of adults who have attained individual tertiary education levels by country is shown in the following table. A 2014 report by the Organisation for Economic Co-operation and Development states that by 2014, 84 percent of young people were completing upper secondary education over their lifetimes, in high-income countries. Tertiary-educated individuals were earning twice as much as median workers. In contrast to historical trends in education, young women were more likely to complete upper secondary education than young men. Additionally, access to education

2800-482: Is taken to include undergraduate and postgraduate education , while vocational education beyond secondary education is known as further education in the United Kingdom , or included under the category of continuing education in the United States . Tertiary education generally culminates in the receipt of certificates , diplomas , or academic degrees . Higher education represents levels 5, 6, 7, and 8 of

2900-409: Is the world's oldest university in continuous operation, and the first university in the sense of a higher-learning and degree-awarding institute, as the word universitas was coined at its foundation. Since World War II , developed and many developing countries have increased the participation of the age group who mostly studies higher education from the elite rate, of up to 15 per cent, to

3000-450: The 1997 version of its schema. They were referred to as level 5 and doctoral studies at level 6. In 2011, this was refined and expanded in the 2011 version of the structure. Higher education at undergraduate level, masters and doctoral level became levels 6, 7, and 8. Nondegree level tertiary education, sometimes referred to as further education or continuing education was reordered as level 4, with level 5 for some higher courses. In

3100-523: The 2011 version of the International Standard Classification of Education structure. Tertiary education at a nondegree level is sometimes referred to as further education or continuing education as distinct from higher education. UNESCO stated that tertiary education focuses on learning endeavors in specialized fields. It includes academic and higher vocational education. The World Bank 's 2019 World Development Report on

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3200-488: The European Union , and more liberal policies regarding international migration . In the U.S., higher education is provided by universities , academies , colleges , seminaries , conservatories , and institutes of technology , and certain college-level institutions, including vocational schools , universities of applied sciences, trade schools, and other career-based colleges that award degrees. Tertiary education at

3300-528: The University of al-Qarawiyyin in Fez, Morocco is the oldest existing continually operating higher educational institution in the world. and is occasionally referred to as the oldest university by scholars. Undoubtedly, there are older institutions of higher education, for example, the University of Ez-Zitouna in Montfleury, Tunis , was first established in 737. The University of Bologna , Italy, founded in 1088,

3400-739: The Università Cattolica del Sacro Cuore in Milan, the LUISS in Rome, the Polytechnic University of Turin , the Politecnico di Milano (which in 2011 was ranked as the 48th best technical university in the world by QS World University Rankings ), the University of Rome La Sapienza (which in 2005 was Europe's 33rd best university, and ranks among Europe's 50 and the world's 150 best colleges and in 2013,

3500-512: The Western Desert of Egypt . The largest crescentic dunes on Earth, with mean crest-to-crest widths of more than three kilometres, are in China's Taklamakan Desert . Abundant barchan dunes may merge into barchanoid ridges, which then grade into linear (or slightly sinuous) transverse dunes, so called because they lie transverse, or across, the wind direction, with the wind blowing perpendicular to

3600-570: The female enrollment ratio exceeding the male ratio by 4 percentage points. The tertiary gross enrollment ratio ranges from 9% in low-income countries to 77% in high-income countries , where, after rapid growth in the 2000s, reached a plateau in the 2010s. Between now and 2030, the biggest increase in tertiary enrollment ratios is expected in middle-income countries, where it will reach 52%. Sustainable Development Goal 4 (SDG 4) commits countries to providing lifelong learning opportunities for all, including tertiary education. This commitment

3700-532: The impact of the COVID-19 pandemic on education is rapidly making certain aspects of the traditional higher education system obsolete. The involvement and funding by foreign regimes in higher education in the US and Europe raised concerns regarding the erosion of democratic norms and hate speech on campuses. The total expenditure on tertiary education ( ISCED levels 5 to 8) as a percentage of GDP for individual countries

3800-447: The slipface of the dunes—that face away from the winds—also move the dunes forward. Tertiary education Tertiary education , also referred to as third-level , third-stage or post-secondary education , is the educational level following the completion of secondary education . The World Bank , for example, defines tertiary education as including universities as well as trade schools and colleges . Higher education

3900-454: The southwest US , for consolidated and hardened sand dunes is "slickrock", a name that was introduced by pioneers of the Old West because their steel-rimmed wagon wheels could not gain traction on the rock. Sand dunes can have a negative impact on humans when they encroach on human habitats. Sand dunes move via a few different means, all of them helped along by wind. One way that dunes can move

4000-659: The stoss (upflow) side, where the sand is pushed up the dune, and have a shorter slip face in the lee side. The valley or trough between dunes is called a dune slack . Dunes are most common in desert environments, where the lack of moisture hinders the growth of vegetation that would otherwise interfere with the development of dunes. However, sand deposits are not restricted to deserts, and dunes are also found along sea shores, along streams in semiarid climates, in areas of glacial outwash , and in other areas where poorly cemented sandstone bedrock disintegrates to produce an ample supply of loose sand. Subaqueous dunes can form from

4100-658: The Byzantine emperor Theodosius II innovated as he established the Pandidakterion , with a faculty of 31 professors, to train public servants. In the 7th and 8th centuries, "cathedral schools" were created in Western Europe. Meanwhile, the first Medresahs were founded in the Moslem empire – initially mere primary schools in the premises of major mosques, which gradually evolved toward secondary, later higher education. However high

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4200-572: The Center for World University Rankings ranked the Sapienza University of Rome 62nd in the world and the top in Italy in its World University Rankings . ) and the University of Milan (whose research and teaching activities have developed over the years and have received important international recognition). This university is the only Italian member of the League of European Research Universities (LERU),

4300-461: The ISO 14001 standard. The ISO 14001 management system development and implementation was conducted by Sonni Gopal. 6.7% of the population has a tertiary education (the highest rate in the province), and another 20.1% has completed secondary education. The overall literacy rate is 80.1%, and is 88.7% among males and 71.4% among females. The commune is composed of 11 localities: Dune A dune

4400-559: The N1 national highway), which leads north to Ghardaïa and Algiers and south to Tamanrasset , and the N52, which leads west to In Ghar and Reggane . Aside from oil and gas reserves, the primary economic activities of In Salah are agricultural in nature with irrigation being supplied by artesian wells . The oasis has over 200,000 date palms . The chief produce are dates, fruits and vegetables. Fruit and vegetable gardens, as well as palm groves, flank

4500-551: The action of water flow ( fluvial processes) on sand or gravel beds of rivers , estuaries , and the sea-bed. Some coastal areas have one or more sets of dunes running parallel to the shoreline directly inland from the beach . In most cases, the dunes are important in protecting the land against potential ravages by storm waves from the sea . Artificial dunes are sometimes constructed to protect coastal areas. The dynamic action of wind and water can sometimes cause dunes to drift, which can have serious consequences. For example,

4600-627: The basis of capacity, by every appropriate means, and in particular by the progressive introduction of free education". In Europe , Article 2 of the First Protocol to the European Convention on Human Rights , adopted in 1950, obliges all signatory parties to guarantee the right to education . In 1994, the UNESCO Salamanca Statement called on the international community to endorse the approach of inclusive education, including at

4700-666: The city of Taxila , later the great Buddhist monastery of Nalanda ( c.  427 - 1197 CE), attracted students and professors even from distant regions. In China , the Han dynasty established chairs to teach the Five Confucean Classics , in the Grand School, Taixue ( c.  3 - 1905  CE ), to train cadres for the imperial administration. All these higher-learning institutions became models for other schools within their sphere of cultural influence. In 425 CE,

4800-409: The coastal environment of the sand dune vital to their species' survival. Over the course of time coastal dunes may be impacted by tropical cyclones or other intense storm activity, dependent on their location. Recent work has suggested that coastal dunes tend to evolve toward a high or low morphology depending on the growth rate of dunes relative to storm frequency. During a storm event, dunes play

4900-604: The concave sides of the dunes. These dunes form under winds that blow consistently from one direction (unimodal winds). They form separate crescents when the sand supply is comparatively small. When the sand supply is greater, they may merge into barchanoid ridges, and then transverse dunes (see below). Some types of crescentic dunes move more quickly over desert surfaces than any other type of dune. A group of dunes moved more than 100 metres per year between 1954 and 1959 in China 's Ningxia Province , and similar speeds have been recorded in

5000-405: The corridors between individual dunes. Because all dune arms are oriented in the same direction, and, the inter-dune corridors are generally swept clear of loose sand, the corridors can usually be traversed in between the trailing arms of the dune. However to cross straight over the dune by going over the trailing arms, can be very difficult. Also, traversing the nose is very difficult as well because

5100-568: The creation of new tertiary colleges. Higher education in Canada includes provincial, territorial, Indigenous and military higher education systems. The ideal objective of Canadian higher education is to offer every Canadian the opportunity to acquire the skills and knowledge necessary to realize their utmost potential. It aspires to cultivate a world-class workforce, enhance the employment rate of Canadians, and safeguard Canada's enduring prosperity. Higher education programs are intricately designed with

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5200-477: The days when few pupils progressed beyond primary education or basic education , the term "higher education" was often used to refer to secondary education, which can create some confusion. This is the origin of the term high school for various schools for children between the ages of 14 and 18 (United States) or 11 and 18 (United Kingdom and Australia). Globally, the gross enrollment ratio in tertiary education increased from 19% in 2000 to 38% in 2017, with

5300-491: The direction (s) of prevailing winds, are known as lunettes, source-bordering dunes, bourrelets and clay dunes. They may be composed of clay, silt, sand, or gypsum, eroded from the basin floor or shore, transported up the concave side of the dune, and deposited on the convex side. Examples in Australia are up to 6.5 km long, 1 km wide, and up to 50 metres high. They also occur in southern and West Africa , and in parts of

5400-657: The distance between the water line and where vegetation can grow. Coastal dunes can be classified by where they develop, or begin to take shape. Dunes are commonly grouped into either the Primary Dune Group or the Secondary Dune Group. Primary dunes gain most of their sand from the beach itself, while secondary dunes gain their sand from the primary dune. Along the Florida Panhandle, most dunes are considered to be foredunes or hummocks. Different locations around

5500-604: The dune and underlying soils . The stability of the dunes was once attributed to the vegetative cover but recent research has pointed to water as the main source of parabolic dune stability. The vegetation that covers them—grasses, shrubs, and trees—help anchor the trailing arms. In inland deserts, parabolic dunes commonly originate and extend downwind from blowouts in sand sheets only partly anchored by vegetation. They can also originate from beach sands and extend inland into vegetated areas in coastal zones and on shores of large lakes. Most parabolic dunes do not reach heights higher than

5600-513: The dunes and provide horticultural benefits, but instead spread taking land away from native species. Ammophila arenaria , known as European beachgrass, has a similar story, though it has no horticulture benefits. It has great ground coverage and, as intended, stabilized the dunes but as an unintended side effect prevented native species from thriving in those dunes. One such example is the dune field at Point Reyes, California . There are now efforts to get rid of both of these invasive species. As

5700-593: The dunes, washing humus into the slacks, and the slacks may be much more developed than the exposed tops of the dunes. It is usually in the slacks that more rare species are developed and there is a tendency for the dune slacks' soil to be waterlogged where only marsh plants can survive. In Europe these plants include: creeping willow, cotton grass, yellow iris , reeds, and rushes. As for vertebrates in European dunes, natterjack toads sometimes breed here. Dune ecosystems are extremely difficult places for plants to survive. This

5800-592: The dunes. Typically these are heather , heaths and gorses . These too are adapted to the low soil water content and have small, prickly leaves which reduce transpiration. Heather adds humus to the soil and is usually replaced by coniferous trees, which can tolerate low soil pH , caused by the accumulation and decomposition of organic matter with nitrate leaching. Coniferous forests and heathland are common climax communities for sand dune systems. Young dunes are called yellow dunes and dunes which have high humus content are called grey dunes . Leaching occurs on

5900-401: The effective winds associated with the growth and migration of both the parabolic and crescent dunes probably are the most consistent in wind direction. The grain size for these well-sorted, very fine to medium sands is about 0.06 to 0.5 mm. Parabolic dunes have loose sand and steep slopes only on their outer flanks. The inner slopes are mostly well packed and anchored by vegetation, as are

6000-480: The field of higher education and helping expand awareness of related issues like international student services and complete campus internationalization. Although tertiary education in the EU includes university, it can differ from country to country. After going to nursery school (French: école maternelle), elementary school (French: école primaire), middle school (French: collège), and high school (French: lycée),

6100-659: The future of work argues that given the future of work and the increasing role of technology in value chains, tertiary education becomes even more relevant for workers to compete in the labor market. Higher education, also called post-secondary education, third-level or tertiary education, is an optional final stage of formal learning that occurs after completion of secondary education . This consists of universities , colleges and polytechnics that offer formal degrees beyond high school or secondary school education. The International Standard Classification of Education in 1997 initially classified all tertiary education together in

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6200-519: The geological record . All these dune shapes may occur in three forms: simple (isolated dunes of basic type), compound (larger dunes on which smaller dunes of same type form), and complex (combinations of different types). Simple dunes are basic forms with the minimum number of slipfaces that define the geometric type. Compound dunes are large dunes on which smaller dunes of similar type and slipface orientation are superimposed. Complex dunes are combinations of two or more dune types. A crescentic dune with

6300-604: The global term " higher education " (i.e. post-18 study). In 2018 the Welsh Government adopted the term "tertiary education" to refer to post-16 education and training in Wales. Since the 1970s, however, specialized further education colleges in England and Wales have called themselves " tertiary colleges " although being part of the secondary education process. These institutions cater for both school leavers and adults, thus combining

6400-595: The globe have dune formations unique to their given coastal profile. Coastal sand dunes can provide privacy and/or habitats to support local flora and fauna. Animals such as sand snakes, lizards, and rodents can live in coastal sand dunes, along with insects of all types. Often the vegetation of sand dunes is discussed without acknowledging the importance that coastal dunes have for animals. Further, some animals, such as foxes and feral pigs can use coastal dunes as hunting grounds to find food. Birds are also known to utilize coastal dunes as nesting grounds. All these species find

6500-408: The harsh conditions of the foredune, typically having deep roots which reach the water table , root nodules that produce nitrogen compounds, and protected stoma , reducing transpiration . Also, the deep roots bind the sand together, and the dune grows into a foredune as more sand is blown over the grasses. The grasses add nitrogen to the soil, meaning other, less hardy plants can then colonize

6600-507: The intellectual level of these schools could be, it would be anachronistic to call them "universities". Their organization and purposes were markedly different from the corporations of students and teachers, independent from both the Church and the State, which established themselves from the 12th century in Western Europe as Universitas Studiorum . According to UNESCO and Guinness World Records ,

6700-478: The last ice age under permafrost conditions dominated by sparse tundra vegetation. Star dunes are pyramidal sand mounds with slipfaces on three or more arms that radiate from the high center of the mound. They tend to accumulate in areas with multidirectional wind regimes. Star dunes grow upward rather than laterally. They dominate the Grand Erg Oriental of the Sahara. In other deserts, they occur around

6800-453: The main functions of an FE college and a sixth form college . Generally, district councils with such colleges have adopted a tertiary system or structure where a single local institution provides all the 16–19 and adult education, and where schools do not universally offer sixth forms (i.e. schools only serve ages 11–16). However the Further and Higher Education Act 1992 has effectively prevented

6900-515: The margins of the sand seas , particularly near topographic barriers. In the southeast Badain Jaran Desert of China, the star dunes are up to 500 metres tall and may be the tallest dunes on Earth. Oval or circular mounds that generally lack a slipface. Dome dunes are rare and occur at the far upwind margins of sand seas. Fixed crescentic dunes that form on the leeward margins of playas and river valleys in arid and semiarid regions in response to

7000-409: The mass rate of 16 to 50 per cent. In many developed countries, participation in higher education has continued to increase towards universal or, what Trow later called, open access, where over half of the relevant age group participate in higher education. Higher education is important to national economies , both as an industry, in its own right, and as a source of trained and educated personnel for

7100-654: The nose is usually made up of loose sand without much if any vegetation. A type of extensive parabolic dune that lacks discernible slipfaces and has mostly coarse grained sand is known as a zibar . The term zibar comes from the Arabic word to describe "rolling transverse ridges ... with a hard surface". The dunes are small, have low relief, and can be found in many places across the planet from Wyoming (United States) to Saudi Arabia to Australia. Spacing between zibars ranges from 50 to 400 metres and they do not become more than 10 metres high. The dunes form at about ninety degrees to

7200-605: The past owners were and the building is restored and moved into by relatives. Four red or violet clay brick ksur (walled towns) are in the oasis, each having its own citadel . In Salah has a hot desert climate ( Köppen climate classification BWh ), with long, extremely hot summers and short, warm winters, and averages just 16 mm (0.63 inches) of rainfall per year. Summer temperatures are consistently high as they commonly approach 50 °C (122 °F) but temperatures at night fall low enough to around 30 °C (86 °F). The high temperature of 49.8 °C (121.6 °F)

7300-523: The perspective of the learner in focus, striving to mitigate risks and assure definite outcomes. Within Australia "tertiary education" refers to continuing studies after a student completes secondary school. Tertiary education options include universities, technical and further education (TAFE) or private universities. The higher education system in the United States is decentralized and regulated independently by each state with accreditors playing

7400-440: The prevailing wind which blows away the small, fine-grained sand leaving behind the coarser grained sand to form the crest. Occurring wherever winds periodically reverse direction, reversing dunes are varieties of any of the above shapes. These dunes typically have major and minor slipfaces oriented in opposite directions. The minor slipfaces are usually temporary, as they appear after a reverse wind and are generally destroyed when

7500-522: The region from May to September. Air flights via In Salah Airport connect the town with the capital Algiers and other major cities in Algeria . The bus station of In Salah hosts buses going to the north and south. There is a hotel, a restaurant, an internet cafe and two camping sites located in the city and surrounding area. The town lies at the junction of the Trans-Sahara Highway (also known as

7600-550: The rest of the economy. College educated workers have commanded a measurable wage premium and are much less likely to become unemployed than less educated workers. In recent years, universities have been criticized for permitting or actively encouraging grade inflation . Widening participation can increase the supply of graduates in individual fields of study over the demand for their skills, aggravating graduate unemployment , underemployment , overqualification and educational inflation . Some commentators have suggested that

7700-478: The resultant direction of sand movement (hence the name "longitudinal"). Some linear dunes merge to form Y-shaped compound dunes. Formation is debated. Ralph Bagnold , in The Physics of Blown Sand and Desert Dunes , suggested that some seif dunes form when a barchan dune moves into a bidirectional wind regime, and one arm or wing of the crescent elongates. Others suggest that seif dunes are formed by vortices in

7800-475: The ridge crest. Seif dunes are linear (or slightly sinuous) dunes with two slip faces. The two slip faces make them sharp-crested. They are called seif dunes after the Arabic word for "sword". They may be more than 160 kilometres (100 miles) long, and thus easily visible in satellite images (see illustrations). Seif dunes are associated with bidirectional winds. The long axes and ridges of these dunes extend along

7900-415: The sand in the dune migrates forward. In plan view, these are U-shaped or V-shaped mounds of well-sorted, very fine to medium sand with elongated arms that extend upwind behind the central part of the dune. There are slipfaces that often occur on the outer side of the nose and on the outer slopes of the arms. These dunes often occur in semiarid areas where the precipitation is retained in the lower parts of

8000-425: The sand particles move leeward; the leeward flux of sand is greater than the windward flux. Conversely, if sand hits from below, sand particles move windward. Further, if the wind is carrying sand particles when it hits the dune, the dune's sand particles will saltate more than if the wind had hit the dune without carrying sand particles. Coastal dunes form when wet sand is deposited along the coast and dries out and

8100-438: The sea. A nabkha , or coppice dune, is a small dune anchored by vegetation. They usually indicate desertification or soil erosion, and serve as nesting and burrow sites for animals. Sub-aqueous ( underwater ) dunes form on a bed of sand or gravel under the actions of water flow. They are ubiquitous in natural channels such as rivers and estuaries, and also form in engineered canals and pipelines. Dunes move downstream as

8200-590: The status of Doctoral Colleges, which function at graduate and post-graduate level. Nine further schools are direct offshoots of the universities (i.e. do not have their own 'university status'). The first one is the Scuola Normale Superiore di Pisa (founded in 1810 by Napoleon as a branch of École Normale Supérieure ), taking the model of organization from the famous École Normale Supérieure . These institutions are commonly referred to as "Schools of Excellence" (i.e. "Scuole di Eccellenza"). Italy hosts

8300-402: The steeper slip face facing downstream. Ripple marks preserved in sedimentary strata in the geological record can be used to determine the direction of current flow, and thus an indication of the source of the sediments. Dunes on the bed of a channel significantly increase flow resistance, their presence and growth playing a major part in river flooding . A lithified (consolidated) sand dune

8400-604: The stoss side, and slides down the lee side. A side of a dune that the sand has slid down is called a slip face (or slipface). The Bagnold formula gives the speed at which particles can be transported. Five basic dune types are recognized: crescentic, linear, star, dome, and parabolic. Dune areas may occur in three forms: simple (isolated dunes of basic type), compound (larger dunes on which smaller dunes of same type form), and complex (combinations of different types). Barchan dunes are crescent-shaped mounds which are generally wider than they are long. The lee-side slipfaces are on

8500-663: The summer. The converse is true in areas with harsher summer weather. There are many threats to these coastal communities. Some coastal dunes, for example ones in San Francisco, have been completely altered by urbanization; reshaping the dune for human use. This puts native species at risk. Another danger, in California and places in the UK specifically, is the introduction of invasive species. Plant species, such as Carpobrotus edulis , were introduced from South Africa in an attempt to stabilize

8600-411: The supervision of Italian's Ministry of Education. Italian universities are among the oldest universities in the world; the University of Bologna (founded in 1088) notably, is the oldest one ever ; also, University of Naples Federico II are is the world's oldest state-funded university in continuous operation. Most universities in Italy are state-supported. 33 Italian universities were ranked among

8700-666: The supply of graduates in some fields of study is exceeding the demand for their skills, aggravating graduate unemployment , underemployment and credentialism . Graduates of tertiary education are likely to have different worldviews and moral values than non-graduates. Research indicates that graduates are more likely to have libertarian principles with less adherence to social hierarchies. Graduates are also more likely to embrace cultural and ethnic diversity and express more positive views towards minority groups. For international relationships, graduates are more likely to favor openness, supporting policies like free trade , open borders ,

8800-599: The tertiary level. Since this time the world has witnessed the global massification of tertiary education, yet this explosion of facilities and enrollment has largely entrenched and exacerbated the exclusion of people with disabilities. This is particularly the case in low- and middle-income contexts, where university completion rates for students with disabilities are much lower compared to completion rates of students without disabilities. Some tertiary schools have been criticized as having permitted or actively encouraged grade inflation . In addition, certain scholars contend that

8900-509: The town of Eucla, Western Australia , had to be relocated in the 1890s because of dune drift. The modern word "dune" came into English from French around 1790, which in turn came from Middle Dutch dūne . A universally precise distinction does not exist between ripples, dunes, and draas , which are all deposits of the same type of materials. Dunes are generally defined as greater than 7 cm tall and may have ripples, while ripples are deposits that are less than 3 cm tall. A draa

9000-580: The training of "swnw" and "swnwt" (male and female doctors ); extant Egyptian papyri from the 3rd millennia BC are in several collections. In the Greek world, Plato's Academy ( c.  387 - 86 BC), Aristotle's Lyceum ( c.  334 - 86 BC) and other philosophical-mathematical schools became models for other establishments, particularly in Alexandria of Egypt, under the Ptolemies . In South Asia ,

9100-471: The upstream slope is eroded and the sediment deposited on the downstream or lee slope in typical bedform construction. In the case of sub-aqueous barchan dunes, sediment is lost by their extremities, known as horns. These dunes most often form as a continuous 'train' of dunes, showing remarkable similarity in wavelength and height. The shape of a dune gives information about its formation environment. For instance, rivers produce asymmetrical ripples, with

9200-472: The village on its southern and western edges. These groves are protected from the always advancing sand by hedges. In Salah is also a centre for nomadic Tuareg . The In Salah oil and gas fields are home to the In Salah Project , a major component of which includes a facility to remove CO 2 from the gas produced. The CO 2 is then re-injected into an underground formation. Historically, In Salah

9300-534: The western United States, especially Texas. U-shaped mounds of sand with convex noses trailed by elongated arms are parabolic dunes. These dunes are formed from blowout dunes where the erosion of vegetated sand leads to a U-shaped depression. The elongated arms are held in place by vegetation; the largest arm known on Earth reaches 12 km. Sometimes these dunes are called U-shaped, blowout , or hairpin dunes, and they are well known in coastal deserts. Unlike crescent shaped dunes, their crests point upwind. The bulk of

9400-402: The wind and lead to the deposition of sand grains. These small "incipient dunes or "shadow dunes" tend to grow in the vertical direction if the obstacle slowing the wind can also grow vertically (i.e., vegetation). Coastal dunes expand laterally as a result of lateral growth of coastal plants via seed or rhizome . Models of coastal dunes suggest that their final equilibrium height is related to

9500-483: The wind next blows in the dominant direction. Draas are very large-scale dune bedforms; they may be tens or a few hundreds of metres in height, kilometres wide, and hundreds of kilometres in length. After a draa has reached a certain size, it generally develops superimposed dune forms. They are thought to be more ancient and slower-moving than smaller dunes, and to form by vertical growth of existing dunes. Draas are widespread in sand seas and are well-represented in

9600-489: The world in terms of graduate recruitment preference by major multinational companies. Bocconi was also ranked by Forbes as the best worldwide in the specific category Value for Money. In May 2008, Bocconi overtook several traditionally top global business schools in the Financial Times Executive education ranking, reaching no. 5 in Europe and no. 15 in the world. Other top universities and polytechnics are

9700-665: The world's top 500 in 2019, the third-largest number in Europe after the United Kingdom and Germany. There are also a number of Superior Graduate Schools ( Grandes écoles ) or Scuola Superiore Universitaria , which offer officially recognized titles, including the Diploma di Perfezionamento equivalent to a Doctorate, Dottorato di Ricerca i.e. Research Doctorate or Doctor Philosophiae i.e. PhD. Some of them also organize master's degree courses. There are three Superior Graduate Schools with "university status", three institutes with

9800-416: Was expanding and growth in the number of people receiving university education was rising sharply. By 2014, close to 40 percent of people aged 25–34 (and around 25 percent of those aged 55–64), were being educated at university. Under devolution in the United Kingdom , education is administered separately in England, Wales, Northern Ireland, and Scotland. In England, the term "tertiary education" aligns with

9900-440: Was formerly a trading town which dealt in slaves, ivory and gold from the south. These goods were exchanged with European goods from the north. In February 2016, BP announced further project start up at In Salah Southern Fields. In Salah Gas, a joint venture between Sonatrach, BP and Statoil today announced the start-up of its Southern Fields project. In Salah Gas was the first project in the world to be environmentally certified to

10000-520: Was registered on 29 July, 2018. Even in early May or in late September, daytime temperatures can easily soar to 45 °C (113 °F). The Sahara region of Algeria is the source of a scorching, sometimes dusty and southerly wind called the Sirocco which parches the plateaus of northern Algeria for up to 40 days and reaches the Tell coastal region for as many as 20 days. During winter, nights can be chilly and frost

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