Misplaced Pages

#932067

92-670: With two different curricula: Undergraduate studies in Petrochemical Engineering were first offered by the Institute in 1941 under the now defunct Superior School of Engineering and Architecture. Undergraduate studies in Chemical Engineering were first offered in 1945 under the direction of Dean Guillermo Torres Prieto. It offers postgraduate studies that are part of the National Register of Postgraduate Studies of

184-628: A bachelor's and master's degree is being introduced by the Bologna process . Under the new Bologna reform, universities in Europe are introducing the Bachelor level (BA or BS) degree, often by dividing a five-year Master-level program into two parts (three-year Bachelor's + two-year Master's), where students are not obligated to continue with the second Master's-degree part. These new bachelor's degrees are similar in structure to British bachelor's degrees. If there

276-1311: A bachelor's degree 's diploma , which usually takes four or, in the case of Law , Veterinary , Geology and Engineering , five years to complete; or a professional diploma, which normally require five or, in the case of medicine , six years to complete. In the United States , undergraduate education refers to a student who is studying for a bachelor's degree. The most common bachelor's degrees are Bachelor of Arts ( BA /AB) and Bachelor of Science ( BS /SB), but other degrees such as Bachelor of Fine Arts ( BFA ), Bachelor of Business Administration ( BBA ), Bachelor of Music ( BM ), Bachelor of Social Work ( BSW ), Bachelor of Engineering/Bachelor of Science in Engineering ( BEng /BSE), Bachelor of Science in Nursing ( BSN ), Bachelor of Business Administration/Bachelor of Science in Business Administration ( BBA /BSBA), Bachelor of Education ( Ed.B ), Bachelor of Liberal Arts ( BLA /ALB), and Bachelor of Architecture ( BArch ) are also possible. Most commonly these degrees require four years of full-time study after high school . An additional accolade to

368-535: A characteristic fabric . All three types may melt again, and when this happens, new magma is formed, from which an igneous rock may once again solidify. Organic matter, such as coal, bitumen, oil, and natural gas, is linked mainly to organic-rich sedimentary rocks. To study all three types of rock, geologists evaluate the minerals of which they are composed and their other physical properties, such as texture and fabric . Geologists also study unlithified materials (referred to as superficial deposits ) that lie above

460-485: A petrographic microscope , where the minerals can be identified through their different properties in plane-polarized and cross-polarized light, including their birefringence , pleochroism , twinning , and interference properties with a conoscopic lens . In the electron microprobe, individual locations are analyzed for their exact chemical compositions and variation in composition within individual crystals. Stable and radioactive isotope studies provide insight into

552-482: A university of applied sciences . These two institutions differ from each other in the level students learn abstract concepts. Education at universities is aimed at research and fundamental principles while at universities of applied sciences it concentrates on applying knowledge in a vocation. Universities of applied sciences typically do not offer master and PhD programs. Students in Scotland usually enter university in

644-618: A certain level of income, and with the state paying all fees for students from the poorest backgrounds. UK students are generally entitled to student loans for maintenance with repayment contingent on income. Unlike in other European countries, the British government does not own the universities' assets and university staff are not civil servants. United Kingdom universities are therefore better described as autonomous, intellectually-independent institutions with public funding, rather than public universities per se. The crown does not control syllabi, with

736-557: A college must meet before it is allowed to call itself a university. Institutions seeking to grow have pursued various steps to turn two-year junior colleges into community colleges, community colleges into four-year colleges, awarding baccalaureate degrees, sometimes while still a community college, and colleges into universities, with graduate (post-baccalaureate) programs. In Bangladesh , three-year undergraduate programs are known as Degree (Pass) courses and four-year undergraduate programs are known as Honours courses. In Hong Kong ,

828-571: A competitive entrance exam known as Vestibular (a concept somewhat similar to the Baccalauréat in France). A later system introduced in 2009, adopted by most federal universities, uses the high school national examination ( ENEM ) result as part or a replacement of the Vestibular grade. Depending on the chosen course, upon graduating the student is granted: a technologist diploma, three years to complete,

920-434: A definite homogeneous chemical composition and an ordered atomic arrangement. Each mineral has distinct physical properties, and there are many tests to determine each of them. Minerals are often identified through these tests. The specimens can be tested for: A rock is any naturally occurring solid mass or aggregate of minerals or mineraloids . Most research in geology is associated with the study of rocks, as they provide

1012-653: A fast pace by adding nearly 20,000 colleges and more than 8 million students in a decade from 2000–01 to 2010–11. As of 2020, India has over 1000 universities, with a break up of 54 central universities , 416 state universities , 125 deemed universities , 361 private universities , 7 Institute under State Legislature Act , and 159 Institutes of National Importance which include IIMs, AIIMS, IITs, IIITs, IISERs and NITs among others. Other institutions include 52,627 colleges as government degree colleges , private colleges, standalone institutes and post-graduate research institutions, functioning under these universities as reported by

SECTION 10

#1732876654933

1104-625: A fifth stage covering college and university programs leading to baccalaureate, professional, master's and doctorate degrees. The pre-primary or preparatory classes, called kachi (literally, unripe) or Nursery school , were formally integrated into the education system in 1988. Students in England , Wales , and Northern Ireland may usually enter university from the age of eighteen, often having studied A-levels and thus having had thirteen to fifteen years of schooling. Occasionally students who finish A Level or equivalent qualifications early (after skipping

1196-623: A length of less than a meter. Rocks at the depth to be ductilely stretched are often also metamorphosed. These stretched rocks can also pinch into lenses, known as boudins , after the French word for "sausage" because of their visual similarity. Where rock units slide past one another, strike-slip faults develop in shallow regions, and become shear zones at deeper depths where the rocks deform ductilely. The addition of new rock units, both depositionally and intrusively, often occurs during deformation. Faulting and other deformational processes result in

1288-448: A means to provide information about geological history and the timing of geological events. The principle of uniformitarianism states that the geological processes observed in operation that modify the Earth's crust at present have worked in much the same way over geological time. A fundamental principle of geology advanced by the 18th-century Scottish physician and geologist James Hutton

1380-608: A number of fields, laboratory, and numerical modeling methods to decipher Earth history and to understand the processes that occur on and inside the Earth. In typical geological investigations, geologists use primary information related to petrology (the study of rocks), stratigraphy (the study of sedimentary layers), and structural geology (the study of positions of rock units and their deformation). In many cases, geologists also study modern soils, rivers , landscapes , and glaciers ; investigate past and current life and biogeochemical pathways, and use geophysical methods to investigate

1472-417: A profession. In some states considerable attention has been given to make sure that community college courses in fact prepare the students for the continuation courses they will encounter at the local college; this process of bringing courses into sequence is called articulation . Some community colleges have automatic enrollment agreements with a local college or university, where the community college provides

1564-451: A sedimentary rock. Sedimentary rocks are mainly divided into four categories: sandstone, shale, carbonate, and evaporite. This group of classifications focuses partly on the size of sedimentary particles (sandstone and shale), and partly on mineralogy and formation processes (carbonation and evaporation). Igneous and sedimentary rocks can then be turned into metamorphic rocks by heat and pressure that change its mineral content, resulting in

1656-434: A short period of time in a relevant industry before students complete their studies. Taking a sandwich course may make the course last a year longer than it would otherwise. With very few exceptions , nearly all universities with the power to award degrees are heavily state financed. However, they also rely on tuition fees set by the government at a maximum index-linked level, repayable after graduation contingent on attaining

1748-493: A single environment and do not necessarily occur in a single order. The Hawaiian Islands , for example, consist almost entirely of layered basaltic lava flows. The sedimentary sequences of the mid-continental United States and the Grand Canyon in the southwestern United States contain almost-undeformed stacks of sedimentary rocks that have remained in place since Cambrian time. Other areas are much more geologically complex. In

1840-412: A student passes the course but fails to do so sufficiently well for third class honours to be awarded he will be awarded with an ordinary degree. It is possible to use the abbreviation "Hons" after the degree postnominals to indicate that the degree has been passed with honours and is not an ordinary degree. Many universities offer sandwich courses or an extramural year, which offer work placements for

1932-559: A two-year community college before further study at a four-year college or university. In most states, community colleges are operated either by a division of the state university or by local special districts subject to guidance from a state agency. Community colleges award associate degrees of different types, some intended to prepare students to transfer to four-year institutions (e.g. Associate of Arts (AA), Associate of Science (AS)), and others intended to provide vocational skills and training for students wishing to enter into or advance in

SECTION 20

#1732876654933

2024-400: A variety of applications. Dating of lava and volcanic ash layers found within a stratigraphic sequence can provide absolute age data for sedimentary rock units that do not contain radioactive isotopes and calibrate relative dating techniques. These methods can also be used to determine ages of pluton emplacement. Thermochemical techniques can be used to determine temperature profiles within

2116-566: A year in school on the grounds of academic giftedness) may enter below this age but large universities are now setting minimum age limits of 16 or 17 after a number of well publicised "child prodigies" were found to be emotionally and mentally unprepared for university life. Applications for undergraduate courses in UK higher education are made through the Universities and Colleges Admissions Service (UCAS). For their first degree, most students read for

2208-464: Is a stub . You can help Misplaced Pages by expanding it . Undergraduate Undergraduate education is education conducted after secondary education and before postgraduate education , usually in a college or university. It typically includes all postsecondary programs up to the level of a bachelor's degree . For example, in the United States, a student pursuing an associate or bachelor's degree

2300-419: Is a branch of natural science concerned with the Earth and other astronomical objects , the rocks of which they are composed, and the processes by which they change over time. Modern geology significantly overlaps all other Earth sciences , including hydrology . It is integrated with Earth system science and planetary science . Geology describes the structure of the Earth on and beneath its surface and

2392-538: Is a separate undergraduate degree, higher degrees (License, Master, Doctorat) can be gained after completing the undergraduate degree. In the traditional German system, there were no undergraduate degrees in some fields, such as engineering: students continued to Master's level education without any administrative breakpoints, and employers would not consider half-finished master's degrees. The Bachelor's phase in The Netherlands can be fulfilled either at university or at

2484-422: Is accomplished in two primary ways: through faulting and folding . In the shallow crust, where brittle deformation can occur, thrust faults form, which causes the deeper rock to move on top of the shallower rock. Because deeper rock is often older, as noted by the principle of superposition , this can result in older rocks moving on top of younger ones. Movement along faults can result in folding, either because

2576-460: Is an intimate coupling between the movement of the plates on the surface and the convection of the mantle (that is, the heat transfer caused by the slow movement of ductile mantle rock). Thus, oceanic parts of plates and the adjoining mantle convection currents always move in the same direction – because the oceanic lithosphere is actually the rigid upper thermal boundary layer of the convecting mantle. This coupling between rigid plates moving on

2668-662: Is divided into two stages; associate degree 's level first-half two years and bachelor 's level second-half two years. Bachelor's degrees are awarded only by universities and NIAD-QE . In Pakistan , it generally requires four years to complete a Bachelor's degree in Arts, Sciences, Dentistry, Engineering or Business Administration such as BA , BS , BDS , BE/BS/BSc Engineering or BBA and five years for bachelor's degrees in medicine ( MBBS ), Physiotherapy ( DPT ), Pharmacy ( Pharm.D ) and Architecture ( B.Arch. ) after successfully completing 12 years of schooling. 4 years bachelor's degree

2760-433: Is horizontal). The principle of superposition states that a sedimentary rock layer in a tectonically undisturbed sequence is younger than the one beneath it and older than the one above it. Logically a younger layer cannot slip beneath a layer previously deposited. This principle allows sedimentary layers to be viewed as a form of the vertical timeline, a partial or complete record of the time elapsed from deposition of

2852-616: Is important for mineral and hydrocarbon exploration and exploitation, evaluating water resources , understanding natural hazards , remediating environmental problems, and providing insights into past climate change . Geology is a major academic discipline , and it is central to geological engineering and plays an important role in geotechnical engineering . The majority of geological data comes from research on solid Earth materials. Meteorites and other extraterrestrial natural materials are also studied by geological methods. Minerals are naturally occurring elements and compounds with

ESIQIE - Misplaced Pages Continue

2944-403: Is known as an undergraduate student while a student pursuing a master's or doctoral degree is a graduate student . Upon completion of courses and other requirements of an undergraduate program , the student would earn the corresponding degree . In some other educational systems, undergraduate education is postsecondary education up to and including the level of a master's degree ; this

3036-557: Is not usually admitted to the degree of bachelor. Master's degrees conferred after extended programs are not to be conflated with the degree of Master of Arts conferred at Oxbridge and Dublin , which is not a substantive qualification, but reflects the ancient practice of those three universities of promoting Bachelors of Arts to Masters of Arts (and thus full membership of the university) six or seven years after matriculation. Honours degrees and integrated master's degrees are awarded with 1st, upper 2nd, lower 2nd or 3rd class honours . If

3128-453: Is offered in various universities of Pakistan such as COMSATS Institute of Information Technology (CIIT), University of Engineering and Technology, Lahore (UET Lahore), University of Engineering and Technology, Taxila (UET Taxila), National University of Sciences and Technology (NUST), Lahore University of Management Sciences (LUMS) and National University of Computer and Emerging Sciences (NU). The modern educational system comprises

3220-478: Is primarily accomplished through normal faulting and through the ductile stretching and thinning. Normal faults drop rock units that are higher below those that are lower. This typically results in younger units ending up below older units. Stretching of units can result in their thinning. In fact, at one location within the Maria Fold and Thrust Belt , the entire sedimentary sequence of the Grand Canyon appears over

3312-537: Is similar in length, and is also considered an academic degree. Though it is designed as a specialist degree, in contrast to the Diplom degree at university , which claims to be more generalist. Germany itself, however, is currently abolishing the legal distinction between Fachhochschule and university. They are both translated as university and they both provide bologna-compliant and equivalent postgraduate degrees. Not obligatory and sometimes applied at universities in

3404-568: Is that "the present is the key to the past." In Hutton's words: "the past history of our globe must be explained by what can be seen to be happening now." The principle of intrusive relationships concerns crosscutting intrusions. In geology, when an igneous intrusion cuts across a formation of sedimentary rock , it can be determined that the igneous intrusion is younger than the sedimentary rock. Different types of intrusions include stocks, laccoliths , batholiths , sills and dikes . The principle of cross-cutting relationships pertains to

3496-729: Is the case for some science courses in Britain and some medicine courses in Europe. In Nigeria , undergraduate degrees (excluding Medicine, Medical Laboratory Science, Nursing, Engineering, Law and Architecture) are four-year-based courses. Medicine (MBBS) and Architecture normally take six years to complete studies while Medical Laboratory Science, Nursing, Law and Engineering courses take five years to complete studies, usually, all six years are taken to improve their chances. Undergraduate nursing degrees or diplomas usually take two to four years and sometimes 5 years to complete, whereas graduate degrees are an additional two years or more. In South Africa ,

3588-462: Is the same as in the rest of UK. In many other, particularly continental European systems, an "undergraduate" degree in the American sense does not exist. Because students are expected to have received a sound general education at the secondary level, in a school such as a gymnasium or lycee , students in Europe enroll in a specific course of studies they wish to pursue upon entry into a university. In

3680-523: Is used for geologically young materials containing organic carbon . The geology of an area changes through time as rock units are deposited and inserted, and deformational processes alter their shapes and locations. Rock units are first emplaced either by deposition onto the surface or intrusion into the overlying rock . Deposition can occur when sediments settle onto the surface of the Earth and later lithify into sedimentary rock, or when as volcanic material such as volcanic ash or lava flows blanket

3772-648: The French system , the first degree of tertiary education was reached two years after the baccalauréat . Amongst these degrees the university-delivered DEUG has disappeared, whereas Diplôme universitaire de technologie , Brevet de Technicien Supérieur or classe préparatoire aux grandes écoles still exist. According to the Bologna process , this two-year curriculum will be replaced by the three-year licence , yet existing. Geology Geology (from Ancient Greek γῆ ( gê )  'earth' and λoγία ( -logía )  'study of, discourse')

ESIQIE - Misplaced Pages Continue

3864-593: The National Council of Science and Technology of Mexico , (CONACYT): ESIQIE is well known for being represented by Águilas Blancas in college football . They are by far the most successful team within the Polytechnic, and one of the most prolific in entire country, having won 5 national championships since their inception. This article on a university, college or other tertiary educational institution in Mexico

3956-632: The University of Delaware also award associate degrees. In the United States, "college" and "university" are terms used differently in different states; New York's terminology is especially confusing (see University of the State of New York ). A university is usually larger than a college, and has programs at the graduate level, but the distinction is not clear-cut. Some colleges (like Smith College ) award graduate degrees, for example, and some colleges are larger than some universities. Some states have requirements

4048-500: The bedrock . This study is often known as Quaternary geology , after the Quaternary period of geologic history, which is the most recent period of geologic time. Magma is the original unlithified source of all igneous rocks . The active flow of molten rock is closely studied in volcanology , and igneous petrology aims to determine the history of igneous rocks from their original molten source to their final crystallization. In

4140-512: The geochemical evolution of rock units. Petrologists can also use fluid inclusion data and perform high temperature and pressure physical experiments to understand the temperatures and pressures at which different mineral phases appear, and how they change through igneous and metamorphic processes. This research can be extrapolated to the field to understand metamorphic processes and the conditions of crystallization of igneous rocks. This work can also help to explain processes that occur within

4232-402: The mantle below (separated within itself by seismic discontinuities at 410 and 660 kilometers), and the outer core and inner core below that. More recently, seismologists have been able to create detailed images of wave speeds inside the earth in the same way a doctor images a body in a CT scan . These images have led to a much more detailed view of the interior of the Earth, and have replaced

4324-440: The 1960s, it was discovered that the Earth's lithosphere , which includes the crust and rigid uppermost portion of the upper mantle , is separated into tectonic plates that move across the plastically deforming, solid, upper mantle, which is called the asthenosphere . This theory is supported by several types of observations, including seafloor spreading and the global distribution of mountain terrain and seismicity. There

4416-424: The Earth, such as subduction and magma chamber evolution. Structural geologists use microscopic analysis of oriented thin sections of geological samples to observe the fabric within the rocks, which gives information about strain within the crystalline structure of the rocks. They also plot and combine measurements of geological structures to better understand the orientations of faults and folds to reconstruct

4508-790: The English system is followed. Students sit for the Certificate of Education examinations at around sixteen years of age, and the Advanced-level, or A-level examinations at around eighteen, then follow by three years of undergraduate education, except for a few specific fields, such as medicine, nursing and law. This is due to be changed, with five-year secondary education and two-year matriculation examination combined and shortened to six years matriculation , and undergraduate education lengthened to four years. Students may be able to receive general education in their first years in universities, more akin to

4600-478: The Grand Canyon in the southwestern United States being a very visible example, the lower rock units were metamorphosed and deformed, and then deformation ended and the upper, undeformed units were deposited. Although any amount of rock emplacement and rock deformation can occur, and they can occur any number of times, these concepts provide a guide to understanding the geological history of an area. Geologists use

4692-507: The MHRD in 2020. Colleges may be Autonomous, i.e. empowered to examine their own degrees, up to PhD level in some cases, or non-autonomous, in which case their examinations are under the supervision of the university to which they are affiliated; in either case, however, degrees are awarded in the name of the university rather than the college. Undergraduate education in Japan requires four years, which

SECTION 50

#1732876654933

4784-494: The Netherlands are the propaedeutic exams. The entire curriculum of the first two semesters of the bachelor's programme is part of the propaedeutic exams. In most bachelor's studies, students are required to obtain their propaedeutic certificate within three semesters after starting the course. A propaedeutic certificate also counts as a requirement for participating in a university level bachelor's study. The propaedeutic exams have

4876-594: The North American system. The first batch of students under the new system will enter universities in 2012. Alternatives are undergraduate certificates or diplomas, with some equivalent to associate degree in educational level. India 's higher education system is the third largest in the world, next to the United States and China . The main governing body at the tertiary level is the University Grants Commission , which enforces its standards, advises

4968-444: The US, students only specialize in a "major" during the last years of college. Specializing in a field of study upon entry into a university means most students graduate after four to five years of study. The fields available include those only taught as graduate degrees in the US, such as law or medicine. In the traditional system of Germany , there is a vocational degree (diploma FH ) that

5060-464: The bachelor's degree is the Honours degree . Unlike in the British model, degrees in law and medicine are not offered at the undergraduate level and instead are completed at a graduate level, after earning a bachelor's degree. Neither field specifies or prefers any undergraduate major, though medical schools require a set of courses that must be taken before enrollment. Students can also choose to attend

5152-537: The beginning of the 20th century, advancement in geological science was facilitated by the ability to obtain accurate absolute dates to geological events using radioactive isotopes and other methods. This changed the understanding of geological time. Previously, geologists could only use fossils and stratigraphic correlation to date sections of rock relative to one another. With isotopic dates, it became possible to assign absolute ages to rock units, and these absolute dates could be applied to fossil sequences in which there

5244-589: The continental European system; free public schools are available from kindergarten up to postgraduation, both as a right established in Article 6, caput of the Brazilian Constitution and as a duty of the State in Article 208, Items I, IV and V, of the Brazilian Constitution. Students choose their specific course of studies before joining the university. Admission to university is obtained by means of

5336-515: The creation of topographic gradients, causing material on the rock unit that is increasing in elevation to be eroded by hillslopes and channels. These sediments are deposited on the rock unit that is going down. Continual motion along the fault maintains the topographic gradient in spite of the movement of sediment and continues to create accommodation space for the material to deposit. Deformational events are often also associated with volcanism and igneous activity. Volcanic ashes and lavas accumulate on

5428-437: The crust, the uplift of mountain ranges, and paleo-topography. Fractionation of the lanthanide series elements is used to compute ages since rocks were removed from the mantle. Other methods are used for more recent events. Optically stimulated luminescence and cosmogenic radionuclide dating are used to date surfaces and/or erosion rates. Dendrochronology can also be used for the dating of landscapes. Radiocarbon dating

5520-569: The degree of Bachelor of Arts at other universities and does not require the level of study necessitated for the other degrees of master awarded by these universities. The degree instead reflects the ancient traditions of these universities. In the sciences, students usually read for the degree of bachelor, which usually takes four years. However, as with the rest of the UK, integrated master's degrees are popular in science and engineering, although in Scotland they last for five years. Degree classification

5612-412: The degree of bachelor, which usually takes three years; however, in the sciences and engineering, integrated courses covering both undergraduate level and advanced degree level leading to the degree of master , usually taking four years and including a research project or dissertation , are popular. Given the integrated nature of these programs someone who gains a master's degree via an integrated program

SECTION 60

#1732876654933

5704-469: The exception of teacher training. The crown restricts the power to award degrees to those with a royal charter , in the case of traditional universities, or authorization from the Secretary of State for Universities , in the case of modern universities . Universities accredited in foreign countries, such as Richmond University are, however, free to operate. In many countries, the English distinction between

5796-570: The fault is a normal fault or a thrust fault . The principle of inclusions and components states that, with sedimentary rocks, if inclusions (or clasts ) are found in a formation, then the inclusions must be older than the formation that contains them. For example, in sedimentary rocks, it is common for gravel from an older formation to be ripped up and included in a newer layer. A similar situation with igneous rocks occurs when xenoliths are found. These foreign bodies are picked up as magma or lava flows, and are incorporated, later to cool in

5888-403: The faults are not planar or because rock layers are dragged along, forming drag folds as slip occurs along the fault. Deeper in the Earth, rocks behave plastically and fold instead of faulting. These folds can either be those where the material in the center of the fold buckles upwards, creating " antiforms ", or where it buckles downwards, creating " synforms ". If the tops of the rock units within

5980-518: The fields of arts, commerce, science etc., and the four-year programs are mostly in the fields of technology, engineering, pharmaceutical sciences, agriculture etc. However, for medicine, law and architecture, the period has been five years. The possessor of the first UG is referred to as graduate and that of the PG degree as post-graduate. Other than UG and PG there are various 1 to 2 year diploma courses available. Indian higher education system has expanded at

6072-453: The first two years of study and the university provides the remaining years of study, sometimes all on one campus. The community colleges award associate degrees, while universities and colleges award the bachelor's. However, some community colleges, such as Brazosport College in Lake Jackson, Texas offer bachelor's degrees along with associate degrees. Conversely, some universities such as

6164-483: The folds remain pointing upwards, they are called anticlines and synclines , respectively. If some of the units in the fold are facing downward, the structure is called an overturned anticline or syncline, and if all of the rock units are overturned or the correct up-direction is unknown, they are simply called by the most general terms, antiforms, and synforms. Even higher pressures and temperatures during horizontal shortening can cause both folding and metamorphism of

6256-437: The following five stages: The Primary school lasting five years for children 5–10 years old in grades one to five; a Middle school of three years for children 10 to 13 years old, covering grades six through eight; a two-year secondary, or Matriculation consists of grades nine and ten, for children 13 to 15 years old; a two-year higher secondary, or Intermediate college , leading to an F.A. in arts or F.Sc. in science; and

6348-404: The formation of faults and the age of the sequences through which they cut. Faults are younger than the rocks they cut; accordingly, if a fault is found that penetrates some formations but not those on top of it, then the formations that were cut are older than the fault, and the ones that are not cut must be younger than the fault. Finding the key bed in these situations may help determine whether

6440-579: The geological history of the Earth as a whole. One aspect is to demonstrate the age of the Earth . Geology provides evidence for plate tectonics , the evolutionary history of life , and the Earth's past climates . Geologists broadly study the properties and processes of Earth and other terrestrial planets. Geologists use a wide variety of methods to understand the Earth's structure and evolution, including fieldwork , rock description , geophysical techniques , chemical analysis , physical experiments , and numerical modelling . In practical terms, geology

6532-498: The government, and helps coordinate between the centre and the state. Accreditation for higher learning is overseen by 15 autonomous institutions established by the University Grants Commission (UGC). In India, the graduation system is classified into two parts: Undergraduate (UG) and Postgraduate (PG). It takes three or four years to complete an undergraduate degree . The three-year undergraduate programs are mostly in

6624-423: The internal composition and structure of the Earth. Seismologists can use the arrival times of seismic waves to image the interior of the Earth. Early advances in this field showed the existence of a liquid outer core (where shear waves were not able to propagate) and a dense solid inner core . These advances led to the development of a layered model of the Earth, with a lithosphere (including crust) on top,

6716-459: The later end of the scale, it is marked by the present day (in the Holocene epoch ). The following five timelines show the geologic time scale to scale. The first shows the entire time from the formation of the Earth to the present, but this gives little space for the most recent eon. The second timeline shows an expanded view of the most recent eon. In a similar way, the most recent era is expanded in

6808-454: The lowest layer to deposition of the highest bed. The principle of faunal succession is based on the appearance of fossils in sedimentary rocks. As organisms exist during the same period throughout the world, their presence or (sometimes) absence provides a relative age of the formations where they appear. Based on principles that William Smith laid out almost a hundred years before the publication of Charles Darwin 's theory of evolution ,

6900-493: The mantle and show the crystallographic structures expected in the inner core of the Earth. The geological time scale encompasses the history of the Earth. It is bracketed at the earliest by the dates of the first Solar System material at 4.567 Ga (or 4.567 billion years ago) and the formation of the Earth at 4.54 Ga (4.54 billion years), which is the beginning of the Hadean eon  – a division of geological time. At

6992-405: The matrix. As a result, xenoliths are older than the rock that contains them. The principle of original horizontality states that the deposition of sediments occurs as essentially horizontal beds. Observation of modern marine and non-marine sediments in a wide variety of environments supports this generalization (although cross-bedding is inclined, the overall orientation of cross-bedded units

7084-413: The primary record of the majority of the geological history of the Earth. There are three major types of rock: igneous , sedimentary , and metamorphic . The rock cycle illustrates the relationships among them (see diagram). When a rock solidifies or crystallizes from melt ( magma or lava ), it is an igneous rock . This rock can be weathered and eroded , then redeposited and lithified into

7176-569: The principles of succession developed independently of evolutionary thought. The principle becomes quite complex, however, given the uncertainties of fossilization, localization of fossil types due to lateral changes in habitat ( facies change in sedimentary strata), and that not all fossils formed globally at the same time. Geologists also use methods to determine the absolute age of rock samples and geological events. These dates are useful on their own and may also be used in conjunction with relative dating methods or to calibrate relative methods. At

7268-423: The processes that have shaped that structure. Geologists study the mineralogical composition of rocks in order to get insight into their history of formation. Geology determines the relative ages of rocks found at a given location; geochemistry (a branch of geology) determines their absolute ages . By combining various petrological, crystallographic, and paleontological tools, geologists are able to chronicle

7360-469: The purpose of assessing whether a student has the appropriate capacities in order to complete the course. At some Swedish universities (such as the Royal Institute of Technology ), PhD courses are sometimes referred to as "graduate courses", whereas courses for other students (up to master level) sometimes are referred to as "undergraduate courses". The system at many Finnish universities is similar. In

7452-428: The rocks. This metamorphism causes changes in the mineral composition of the rocks; creates a foliation , or planar surface, that is related to mineral growth under stress. This can remove signs of the original textures of the rocks, such as bedding in sedimentary rocks, flow features of lavas , and crystal patterns in crystalline rocks . Extension causes the rock units as a whole to become longer and thinner. This

7544-433: The simplified layered model with a much more dynamic model. Mineralogists have been able to use the pressure and temperature data from the seismic and modeling studies alongside knowledge of the elemental composition of the Earth to reproduce these conditions in experimental settings and measure changes within the crystal structure. These studies explain the chemical changes associated with the major seismic discontinuities in

7636-524: The southwestern United States, sedimentary, volcanic, and intrusive rocks have been metamorphosed, faulted, foliated, and folded. Even older rocks, such as the Acasta gneiss of the Slave craton in northwestern Canada , the oldest known rock in the world have been metamorphosed to the point where their origin is indiscernible without laboratory analysis. In addition, these processes can occur in stages. In many places,

7728-550: The subsurface. Sub-specialities of geology may distinguish endogenous and exogenous geology. Geological field work varies depending on the task at hand. Typical fieldwork could consist of: In addition to identifying rocks in the field ( lithology ), petrologists identify rock samples in the laboratory. Two of the primary methods for identifying rocks in the laboratory are through optical microscopy and by using an electron microprobe . In an optical mineralogy analysis, petrologists analyze thin sections of rock samples using

7820-407: The surface of the Earth and the convecting mantle is called plate tectonics . The development of plate tectonics has provided a physical basis for many observations of the solid Earth . Long linear regions of geological features are explained as plate boundaries: Plate tectonics has provided a mechanism for Alfred Wegener 's theory of continental drift , in which the continents move across

7912-488: The surface of the Earth over geological time. They also provided a driving force for crustal deformation, and a new setting for the observations of structural geology. The power of the theory of plate tectonics lies in its ability to combine all of these observations into a single theory of how the lithosphere moves over the convecting mantle. Advances in seismology , computer modeling , and mineralogy and crystallography at high temperatures and pressures give insights into

8004-474: The surface, and igneous intrusions enter from below. Dikes , long, planar igneous intrusions, enter along cracks, and therefore often form in large numbers in areas that are being actively deformed. This can result in the emplacement of dike swarms , such as those that are observable across the Canadian shield, or rings of dikes around the lava tube of a volcano. All of these processes do not necessarily occur in

8096-742: The surface. Igneous intrusions such as batholiths , laccoliths , dikes , and sills , push upwards into the overlying rock, and crystallize as they intrude. After the initial sequence of rocks has been deposited, the rock units can be deformed and/or metamorphosed . Deformation typically occurs as a result of horizontal shortening, horizontal extension , or side-to-side ( strike-slip ) motion. These structural regimes broadly relate to convergent boundaries , divergent boundaries , and transform boundaries, respectively, between tectonic plates. When rock units are placed under horizontal compression , they shorten and become thicker. Because rock units, other than muds, do not significantly change in volume , this

8188-407: The third timeline, the most recent period is expanded in the fourth timeline, and the most recent epoch is expanded in the fifth timeline. Horizontal scale is Millions of years (above timelines) / Thousands of years (below timeline) Epochs: Methods for relative dating were developed when geology first emerged as a natural science . Geologists still use the following principles today as

8280-415: The undergraduate system usually has a three-year undergraduate bachelor's degree, with two or three majors. (There are exceptions, such as the medical qualification (MBChB), which is six years, and Engineering which is four.) A fourth year, known as an Honours year, is considered a post-graduate degree. It is usually course-driven, although may include a project or thesis. Brazil follows the major traits of

8372-471: The year they turn eighteen, with many starting at seventeen; courses take a year longer than in the rest of the UK. At the older universities the degree of Master of Arts is conferred in the arts subjects after four years while the newer universities instead confer the degree of Bachelor of Arts . The degree of Master of Arts conferred by the Ancient Scottish Universities is equivalent to

8464-615: Was datable material, converting the old relative ages into new absolute ages. For many geological applications, isotope ratios of radioactive elements are measured in minerals that give the amount of time that has passed since a rock passed through its particular closure temperature , the point at which different radiometric isotopes stop diffusing into and out of the crystal lattice . These are used in geochronologic and thermochronologic studies. Common methods include uranium–lead dating , potassium–argon dating , argon–argon dating and uranium–thorium dating . These methods are used for

#932067