1.
The Geographer
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The Geographer is a painting created by Dutch artist Johannes Vermeer in 1668–1669, and is now in the collection of the Städelsches Kunstinstitut museum in Frankfurt, Germany. It is closely related to Vermeers The Astronomer, for using the same model in the same dress. A2017 study indicated that the canvas for the two came from the same bolt of material. This is one of three paintings Vermeer signed and dated. Details of the face are slightly blurred, suggesting movement. His eyes are narrowed, perhaps squinting in the sunlight or an indication of intense thinking, Carr asserts that the painting depicts a flash of inspiration or even revelation. The drawn curtain on the left and the position of the carpet on the table—pushed back—are both symbols of revelation. He grips a book as if hes about to snatch it up to corroborate his ideas, the globe was published in Amsterdam in 1618 by Jodocus Hondius. The globe is turned toward the Indian Ocean, where the Dutch East India Company was then active, Vermeer used an impasto technique to apply pointillé dots, not to indicate light reflected more strongly on certain points but to emphasize the dull ochre cartouche frame printed on the globe. Since the globe can be identified, we know the decorative cartouche includes a plea for information for future editions—reflecting the theme of revelation in the painting, the sea chart on the wall of all the Sea coasts of Europe has been identified as one published by Willem Jansz Blaeu. This accuracy indicates Vermeer had a source familiar with the profession, the Astronomer, which seems to form a pendant with this painting, shows a similar, sophisticated knowledge of cartographic instruments and books, and the same young man modeled for both. That man himself may have been the source of Vermeers correct display of surveying and geographical instruments, Wheelock and others assert the model/source was probably Anthonie van Leeuwenhoek, a contemporary of Vermeer who was also born in Delft. The families of men were in the textile business, and both families had a strong interest in science and optics. A microscopist, van Leeuwenhoek was described after his death as being so skilled in navigation, astronomy, mathematics, philosophy and that one can certainly place him with the most distinguished masteres of the art. Another image of van Leeuwenhoek about 20 years later shows a face and straight nose. At the time Vermeer painted the two works, the scientist would have been about 36 years old and he would have been actively studying for his examination for surveyor, which he passed on February 4,1669. There is no evidence for any kind of relationship between the two men during Vermeers lifetime, although in 1676, van Leeuwenhoek was appointed a trustee for Vermeers estate. The pose of the figure in Vermeers painting takes up precisely the position of Faust in Rembrandts famous etching, according to Lawrence Gowing, similar arrangements can be found in drawings by Nicolaes Maes
2.
Johannes Vermeer
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Johannes, Jan or Johan Vermeer was a Dutch painter who specialized in domestic interior scenes of middle-class life. Vermeer was a successful provincial genre painter in his lifetime. He evidently was not wealthy, leaving his wife and children in debt at his death, Vermeer worked slowly and with great care, and frequently used very expensive pigments. He is particularly renowned for his treatment and use of light in his work. Vermeer painted mostly domestic interior scenes and he was recognized during his lifetime in Delft and The Hague, but his modest celebrity gave way to obscurity after his death. He was barely mentioned in Arnold Houbrakens major source book on 17th-century Dutch painting, since that time, Vermeers reputation has grown, and he is now acknowledged as one of the greatest painters of the Dutch Golden Age. Relatively little was known about Vermeers life until recently and he seems to have been devoted exclusively to his art, living out his life in the city of Delft. Until the 19th century, the sources of information were some registers, a few official documents. John Michael Montias added details on the family from the city archives of Delft in his Artists and Artisans in Delft, Johannes Vermeer was baptized in the Reformed Church on 31 October 1632. His father Reijnier Janszoon was a worker of silk or caffa. As an apprentice in Amsterdam, Reijnier lived on fashionable Sint Antoniesbreestraat, in 1615, he married Digna Baltus. The couple moved to Delft and had a daughter named Geertruy who was baptized in 1620, in 1625, Reijnier was involved in a fight with a soldier named Willem van Bylandt who died from his wounds five months later. Around this time, Reijnier began dealing in paintings, in 1631, he leased an inn, which he called The Flying Fox. In 1635, he lived on Voldersgracht 25 or 26, in 1641, he bought a larger inn on the market square, named after the Flemish town Mechelen. The acquisition of the inn constituted a financial burden. When Vermeers father died in October 1652, Vermeer took over the operation of the art business. In April 1653, Johannes Reijniersz Vermeer married a Catholic girl, the blessing took place in the quiet nearby village of Schipluiden. Vermeers new mother-in-law Maria Thins was significantly wealthier than he, according to art historian Walter Liedtke, Vermeers conversion seems to have been made with conviction
3.
Geography
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Geography is a field of science devoted to the study of the lands, the features, the inhabitants, and the phenomena of Earth. The first person to use the word γεωγραφία was Eratosthenes, Geography is an all-encompassing discipline that seeks an understanding of the Earth and its human and natural complexities—not merely where objects are, but how they have changed and come to be. It is often defined in terms of the two branches of geography and physical geography. Geography has been called the world discipline and the bridge between the human and the physical sciences, Geography is a systematic study of the Earth and its features. Traditionally, geography has been associated with cartography and place names, although many geographers are trained in toponymy and cartology, this is not their main preoccupation. Geographers study the space and the temporal database distribution of phenomena, processes, because space and place affect a variety of topics, such as economics, health, climate, plants and animals, geography is highly interdisciplinary. The interdisciplinary nature of the approach depends on an attentiveness to the relationship between physical and human phenomena and its spatial patterns. Names of places. are not geography. know by heart a whole gazetteer full of them would not, in itself and this is a description of the world—that is Geography. In a word Geography is a Science—a thing not of mere names but of argument and reason, of cause, just as all phenomena exist in time and thus have a history, they also exist in space and have a geography. Geography as a discipline can be split broadly into two main fields, human geography and physical geography. The former largely focuses on the environment and how humans create, view, manage. The latter examines the environment, and how organisms, climate, soil, water. The difference between these led to a third field, environmental geography, which combines physical and human geography. Physical geography focuses on geography as an Earth science and it aims to understand the physical problems and the issues of lithosphere, hydrosphere, atmosphere, pedosphere, and global flora and fauna patterns. Physical geography can be divided into broad categories, including, Human geography is a branch of geography that focuses on the study of patterns. It encompasses the human, political, cultural, social, and it requires an understanding of the traditional aspects of physical and human geography, as well as the ways that human societies conceptualize the environment. Integrated geography has emerged as a bridge between the human and the geography, as a result of the increasing specialisation of the two sub-fields. Examples of areas of research in the environmental geography include, emergency management, environmental management, sustainability, geomatics is concerned with the application of computers to the traditional spatial techniques used in cartography and topography
4.
Earth
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Earth, otherwise known as the World, or the Globe, is the third planet from the Sun and the only object in the Universe known to harbor life. It is the densest planet in the Solar System and the largest of the four terrestrial planets, according to radiometric dating and other sources of evidence, Earth formed about 4.54 billion years ago. Earths gravity interacts with objects in space, especially the Sun. During one orbit around the Sun, Earth rotates about its axis over 365 times, thus, Earths axis of rotation is tilted, producing seasonal variations on the planets surface. The gravitational interaction between the Earth and Moon causes ocean tides, stabilizes the Earths orientation on its axis, Earths lithosphere is divided into several rigid tectonic plates that migrate across the surface over periods of many millions of years. About 71% of Earths surface is covered with water, mostly by its oceans, the remaining 29% is land consisting of continents and islands that together have many lakes, rivers and other sources of water that contribute to the hydrosphere. The majority of Earths polar regions are covered in ice, including the Antarctic ice sheet, Earths interior remains active with a solid iron inner core, a liquid outer core that generates the Earths magnetic field, and a convecting mantle that drives plate tectonics. Within the first billion years of Earths history, life appeared in the oceans and began to affect the Earths atmosphere and surface, some geological evidence indicates that life may have arisen as much as 4.1 billion years ago. Since then, the combination of Earths distance from the Sun, physical properties, in the history of the Earth, biodiversity has gone through long periods of expansion, occasionally punctuated by mass extinction events. Over 99% of all species that lived on Earth are extinct. Estimates of the number of species on Earth today vary widely, over 7.4 billion humans live on Earth and depend on its biosphere and minerals for their survival. Humans have developed diverse societies and cultures, politically, the world has about 200 sovereign states, the modern English word Earth developed from a wide variety of Middle English forms, which derived from an Old English noun most often spelled eorðe. It has cognates in every Germanic language, and their proto-Germanic root has been reconstructed as *erþō, originally, earth was written in lowercase, and from early Middle English, its definite sense as the globe was expressed as the earth. By early Modern English, many nouns were capitalized, and the became the Earth. More recently, the name is simply given as Earth. House styles now vary, Oxford spelling recognizes the lowercase form as the most common, another convention capitalizes Earth when appearing as a name but writes it in lowercase when preceded by the. It almost always appears in lowercase in colloquial expressions such as what on earth are you doing, the oldest material found in the Solar System is dated to 4. 5672±0.0006 billion years ago. By 4. 54±0.04 Gya the primordial Earth had formed, the formation and evolution of Solar System bodies occurred along with the Sun
5.
Cartography
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Cartography is the study and practice of making maps. Combining science, aesthetics, and technique, cartography builds on the premise that reality can be modeled in ways that communicate spatial information effectively, the fundamental problems of traditional cartography are to, Set the maps agenda and select traits of the object to be mapped. This is the concern of map editing, traits may be physical, such as roads or land masses, or may be abstract, such as toponyms or political boundaries. Represent the terrain of the object on flat media. This is the concern of map projections, eliminate characteristics of the mapped object that are not relevant to the maps purpose. This is the concern of generalization, reduce the complexity of the characteristics that will be mapped. This is also the concern of generalization, orchestrate the elements of the map to best convey its message to its audience. This is the concern of map design, modern cartography constitutes many theoretical and practical foundations of geographic information systems. The earliest known map is a matter of debate, both because the term map isnt well-defined and because some artifacts that might be maps might actually be something else. A wall painting that might depict the ancient Anatolian city of Çatalhöyük has been dated to the late 7th millennium BCE, the oldest surviving world maps are from 9th century BCE Babylonia. One shows Babylon on the Euphrates, surrounded by Assyria, Urartu and several cities, all, in turn, another depicts Babylon as being north of the world center. The ancient Greeks and Romans created maps since Anaximander in the 6th century BCE, in the 2nd century AD, Ptolemy wrote his treatise on cartography, Geographia. This contained Ptolemys world map – the world known to Western society. As early as the 8th century, Arab scholars were translating the works of the Greek geographers into Arabic, in ancient China, geographical literature dates to the 5th century BCE. The oldest extant Chinese maps come from the State of Qin, dated back to the 4th century BCE, in the book of the Xin Yi Xiang Fa Yao, published in 1092 by the Chinese scientist Su Song, a star map on the equidistant cylindrical projection. Early forms of cartography of India included depictions of the pole star and these charts may have been used for navigation. Mappa mundi are the Medieval European maps of the world, approximately 1,100 mappae mundi are known to have survived from the Middle Ages. Of these, some 900 are found illustrating manuscripts and the remainder exist as stand-alone documents, the Arab geographer Muhammad al-Idrisi produced his medieval atlas Tabula Rogeriana in 1154
6.
Geographic information system
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A geographic information system is a system designed to capture, store, manipulate, analyze, manage, and present spatial or geographic data. What goes beyond a GIS is a spatial data infrastructure, a concept that has no such restrictive boundaries, in general, the term describes any information system that integrates, stores, edits, analyzes, shares, and displays geographic information. GIS applications are tools that allow users to create interactive queries, analyze spatial information, edit data in maps, Geographic information science is the science underlying geographic concepts, applications, and systems. GIS is a term that can refer to a number of different technologies, processes. It is attached to operations and has many applications related to engineering, planning, management, transport/logistics, insurance, telecommunications. For that reason, GIS and location intelligence applications can be the foundation for many location-enabled services that rely on analysis, GIS can relate unrelated information by using location as the key index variable. Locations or extents in the Earth space–time may be recorded as dates/times of occurrence, and x, y, and z coordinates representing, longitude, latitude, all Earth-based spatial–temporal location and extent references should be relatable to one another and ultimately to a real physical location or extent. This key characteristic of GIS has begun to open new avenues of scientific inquiry, the first known use of the term geographic information system was by Roger Tomlinson in the year 1968 in his paper A Geographic Information System for Regional Planning. Tomlinson is also acknowledged as the father of GIS, previously, one of the first applications of spatial analysis in epidemiology is the 1832 Rapport sur la marche et les effets du choléra dans Paris et le département de la Seine. The French geographer Charles Picquet represented the 48 districts of the city of Paris by halftone color gradient according to the number of deaths by cholera per 1,000 inhabitants and this was one of the earliest successful uses of a geographic methodology in epidemiology. The early 20th century saw the development of photozincography, which allowed maps to be split into layers, for one layer for vegetation. This work was drawn on glass plates but later plastic film was introduced, with the advantages of being lighter, using less storage space and being less brittle. When all the layers were finished, they were combined into one using a large process camera. Once color printing came in, the idea was also used for creating separate printing plates for each color. Computer hardware development spurred by nuclear weapon research led to general-purpose computer mapping applications by the early 1960s, the year 1960 saw the development of the worlds first true operational GIS in Ottawa, Ontario, Canada by the federal Department of Forestry and Rural Development. A rating classification factor was added to permit analysis. CGIS was an improvement over computer mapping applications as it provided capabilities for overlay, measurement and it supported a national coordinate system that spanned the continent, coded lines as arcs having a true embedded topology and it stored the attribute and locational information in separate files. As a result of this, Tomlinson has become known as the father of GIS, CGIS lasted into the 1990s and built a large digital land resource database in Canada
7.
History of geography
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The history of geography includes many histories of geography which have differed over time and between different cultural and political groups. In more recent developments, geography has become an academic discipline. Geography derives from the Greek γεωγραφία – geographia, a translation of which would be to describe or write about the Earth. The first person to use the word geography was Eratosthenes, however, there is evidence for recognizable practices of geography, such as cartography prior to the use of the term geography. The known world of Ancient Egypt saw the Nile as the centre, various oases were known to the east and west, and were considered locations of various gods 12. To the South lay the Kushitic region, known as far as the 4th cataract, punt was a region south along the shores of the Red Sea. Various Asiatic peoples were known as Retenu, Kanaan, Que, Harranu, at various times especially in the Late Bronze Age Egyptians had diplomatic and trade relationships with Babylonia and Elam. The Mediterranean was called the Great Green and was believed to be part of a world encircling ocean, Europe was unknown although may have become part of the Egyptian world view in Phoenician times. The oldest known world maps date back to ancient Babylon from the 9th century BC, the best known Babylonian world map, however, is the Imago Mundi of 600 BC. The accompanying text mentions seven outer regions beyond the encircling ocean, the descriptions of five of them have survived. The ancient Greeks saw the poet Homer as the founder of geography and his works the Iliad and the Odyssey are works of literature, but both contain a great deal of geographical information. Homer describes a circular world ringed by a massive ocean. The works show that the Greeks by the 8th century BC had considerable knowledge of the geography of the eastern Mediterranean. The poems contain a number of place names and descriptions. Thales of Miletus is one of the first known philosophers known to have wondered about the shape of the world and he proposed that the world was based on water, and that all things grew out of it. He also laid down many of the astronomical and mathematical rules that would allow geography to be studied scientifically and his successor Anaximander is the first person known to have attempted to create a scale map of the known world and to have introduced the gnomon to Ancient Greece. From these accounts he wrote a prose account of what was known of the world. A similar work, and one that survives today, is Herodotus Histories
8.
Geography and cartography in medieval Islam
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Medieval Islamic geography was based on Hellenistic geography and reached its apex with Muhammad al-Idrisi in the 12th century. After its beginnings in the 8th century based on Hellenistic geography, various Islamic scholars contributed to its development, and the most notable include Al-Khwārizmī, Abū Zayd al-Balkhī, and Abu Rayhan Biruni. Islamic cartographers inherited Ptolemys Almagest and Geography in the 9th century and these works stimulated an interest in geography but were not slavishly followed. Having received Greek writings directly and without Latin intermediation, Arabian and Persian geographers made no use of European-style T-O maps, muslim scientists made many of their own contributions to geography and the earth sciences. In the 11th century, the Uyghur scholar Mahmud al-Kashgari was the first to draw a map of the Turkic peoples of Central Asia. These medieval developments influenced Chinese geography under the Mongol Empire and they also provided the underpinnings of the cartographic work of the Ottoman cartographer Piri Reis. History of geography History of cartography Notes Citations Bibliography How Greek Science Passed to the Arabs by De Lacy OLeary Islamic Geography in the Middle Ages
9.
Age of Discovery
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It also marks the rise of the period of widespread adoption in Europe of colonialism and mercantilism. Many lands previously unknown to Europeans were discovered during this period, from the perspective of many non-Europeans, the Age of Discovery marked the arrival of settlers and invaders from a previously unknown continent. This represented one of the most-significant global events concerning ecology, agriculture and it also allowed for the expansion of Christianity throughout the world with the spread of missionary activity, becoming the worlds largest religion. The Portuguese began systematically exploring the Atlantic coast of Africa from 1418, in 1488 Bartolomeu Dias reached the Indian Ocean by this route. In 1492 the Catholic Monarchs of Castile and Aragon funded Christopher Columbuss plan to sail west to reach the Indies by crossing the Atlantic and he landed on a continent uncharted by Europeans and seen as a new world, the Americas. In 1498, a Portuguese expedition commanded by Vasco da Gama reached India by sailing around Africa, soon, the Portuguese sailed further eastward, to the valuable Spice Islands in 1512, landing in China one year later. In 1513, Spanish Vasco Núñez de Balboa crossed the Isthmus of Panama, thus, Europe first received news of the eastern and western Pacific within a one-year span around 1512. Meanwhile, from the 1580s to the 1640s, Russians explored and conquered almost the whole of Siberia, another source was the Radhanite Jewish trade networks of merchants established as go-betweens between Europe and the Muslim world during the time of the Crusader states. Knowledge about the Atlantic African coast was fragmented and derived mainly from old Greek and Roman maps based on Carthaginian knowledge, the Red Sea was barely known and only trade links with the Maritime republics, the Republic of Venice especially, fostered collection of accurate maritime knowledge. Indian Ocean trade routes were sailed by Arab traders, between 1405 and 1421, the Yongle Emperor of Ming China sponsored a series of long range tributary missions under the command of Zheng He. The fleets visited Arabia, East Africa, India, Maritime Southeast Asia, by 1400 a Latin translation of Ptolemys Geographia reached Italy coming from Constantinople. The rediscovery of Roman geographical knowledge was a revelation, both for mapmaking and worldview, although reinforcing the idea that the Indian Ocean was landlocked, a prelude to the Age of Discovery was a series of European expeditions crossing Eurasia by land in the late Middle Ages. A series of Europeans took advantage of these to explore eastwards, most were Italians, as trade between Europe and the Middle East was controlled mainly by the Maritime republics. The close Italian links to the Levant raised great curiosity and commercial interest in countries which lay further east, christian embassies were sent as far as Karakorum during the Mongol invasions of the Levant, from which they gained a greater understanding of the world. The first of these travellers was Giovanni da Pian del Carpine, dispatched by Pope Innocent IV to the Great Khan, about the same time, Russian prince Yaroslav of Vladimir, and subsequently his sons Alexander Nevsky and Andrey II of Vladimir, travelled to the Mongolian capital. Though having strong political implications, their journeys left no detailed accounts, other travellers followed, like French André de Longjumeau and Flemish William of Rubruck, who reached China through Central Asia. After returning, he dictated an account of his journeys to a scholar he met in Granada, the Rihla, between 1357 and 1371 a book of supposed travels compiled by John Mandeville acquired extraordinary popularity. These overland journeys had little immediate effect, the Mongol Empire collapsed almost as quickly as it formed and soon the route to the east became more difficult and dangerous
10.
History of cartography
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Cartography, or mapmaking, has been an integral part of the human history for thousands of years. Maps began as drawings but can also adopt three-dimensional shapes. The term cartography is modern, loaned into English from French cartographie in the 1840s, the earliest known maps are of the stars, not the earth. Dots dating to 16,500 BC found on the walls of the Lascaux caves map out part of the night sky, the Cuevas de El Castillo in Spain contain a dot map of the Corona Borealis constellation dating from 12,000 BC. Cave painting and rock carvings used simple visual elements that may have aided in recognizing landscape features, another ancient picture that resembles a map was created in the late 7th millennium BC in Çatalhöyük, Anatolia, modern Turkey. This wall painting may represent a plan of this Neolithic village, however, Maps in Ancient Babylonia were made by using accurate surveying techniques. For example, a 7.6 ×6.8 cm clay tablet found in 1930 at Ga-Sur, near contemporary Kirkuk, cuneiform inscriptions label the features on the map, including a plot of land described as 354 iku that was owned by a person called Azala. Most scholars date the tablet to the 25th to 24th century BC, Leo Bagrow dissents with a date of 7000 BC. Hills are shown by overlapping semicircles, rivers by lines, the map also is marked to show the cardinal directions. An engraved map from the Kassite period of Babylonian history shows walls, in contrast, the Babylonian World Map, the earliest surviving map of the world, is a symbolic, not a literal representation. It deliberately omits peoples such as the Persians and Egyptians, who were known to the Babylonians. The area shown is depicted as a circular shape surrounded by water, examples of maps from ancient Egypt are quite rare. Its originality can be seen in the inscriptions, its precise orientation. In reviewing the literature of early geography and early conceptions of the earth, all lead to Homer. Regardless of the doubts about Homers existence, one thing is certain, Homers knowledge of the Earth was very limited. He and his Greek contemporaries knew very little of the Earth beyond Egypt as far south as the Libyan desert, the south-west coast of Asia Minor, furthermore, the coast of the Black Sea was only known through myths and legends that circulated during his time. In his poems there is no mention of Europe and Asia as geographical concepts and that is why the big part of Homers world that is portrayed on this interpretive map represents lands that border on the Aegean Sea. Additional statements about ancient geography may be found in Hesiods poems, through the lyrics of Works and Days and Theogony he shows to his contemporaries some definite geographical knowledge. He introduces the names of rivers as Nile, Ister, the shores of the Bosporus, and the Euxine, the coast of Gaul, the island of Sicily
11.
Geomorphology
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Geomorphology is the scientific study of the origin and evolution of topographic and bathymetric features created by physical, chemical or biological processes operating at or near the Earths surface. Geomorphologists work within disciplines such as geography, geology, geodesy, engineering geology, archaeology. This broad base of interests contributes to many styles and interests within the field. Earths surface is modified by a combination of processes that sculpt landscapes, and geologic processes that cause tectonic uplift and subsidence. Many of these factors are strongly mediated by climate, the broad-scale topographies of the Earth illustrate this intersection of surface and subsurface action. Mountain belts are uplifted due to geologic processes, denudation of these high uplifted regions produces sediment that is transported and deposited elsewhere within the landscape or off the coast. On progressively smaller scales, similar ideas apply, where individual landforms evolve in response to the balance of additive processes, often, these processes directly affect each other, ice sheets, water, and sediment are all loads that change topography through flexural isostasy. Topography can modify the climate, for example through orographic precipitation. Many geomorphologists are particularly interested in the potential for feedbacks between climate and tectonics, mediated by geomorphic processes, in addition to these broad-scale questions, geomorphologists address issues that are more specific and/or more local. Fluvial geomorphologists focus on rivers, how they transport sediment, migrate across the landscape, cut into bedrock, respond to environmental and tectonic changes, and interact with humans. Soils geomorphologists investigate soil profiles and chemistry to learn about the history of a landscape and understand how climate, biota. Other geomorphologists study how hillslopes form and change, still others investigate the relationships between ecology and geomorphology. Because geomorphology is defined to comprise everything related to the surface of the Earth and its modification, geomorphologists use a wide range of techniques in their work. These may include fieldwork and field data collection, the interpretation of remotely sensed data, geochemical analyses, geomorphologists may rely on geochronology, using dating methods to measure the rate of changes to the surface. Practical applications of geomorphology include hazard assessment, river control and stream restoration, planetary geomorphology studies landforms on other terrestrial planets such as Mars. Indications of effects of wind, fluvial, glacial, mass wasting, meteor impact, tectonics and this effort not only helps better understand the geologic and atmospheric history of those planets but also extends geomorphological study of the Earth. Planetary geomorphologists often use Earth analogues to aid in their study of surfaces of other planets, other than some notable exceptions in antiquity, geomorphology is a relatively young science, growing along with interest in other aspects of the earth sciences in the mid-19th century. This section provides a brief outline of some of the major figures
12.
Glaciology
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Glaciology is the scientific study of glaciers, or more generally ice and natural phenomena that involve ice. Glaciology is an earth science that integrates geophysics, geology, physical geography, geomorphology, climatology, meteorology, hydrology, biology. The impact of glaciers on people includes the fields of human geography, the discoveries of water ice on the Moon, Mars, Europa and Pluto add an extraterrestrial component to the field, as in astroglaciology. Areas of study within glaciology include glacial history and the reconstruction of past glaciation, a glaciologist is a person who studies glaciers. A glacial geologist studies glacial deposits and glacial erosive features on the landscape, glaciology and glacial geology are key areas of polar research. Alpine - ice flows down the valleys of mountainous areas and forms a tongue of ice moving towards the plains below, continental - an ice sheet found today, only in high latitudes, thousands of square kilometers in area and thousands of meters thick. These tend to smooth out the landscapes, accumulation, where the formation of ice is faster than its removal. Wastage or ablation, where the sum of melting and evaporation is greater than the amount of snow added each year, ablation wastage of the glacier through sublimation, ice melting and iceberg calving. Ablation zone Area of a glacier in which the loss of ice through ablation exceeds the annual gain from precipitation. Arête an acute ridge of rock where two cirques abut, bergschrund crevasse formed near the head of a glacier, where the mass of ice has rotated, sheared and torn itself apart in the manner of a geological fault. Cirque, corrie or cwm bowl shaped depression excavated by the source of a glacier, creep adjustment to stress at a molecular level. Flow movement in a constant direction, fracture brittle failure under the stress raised when movement is too rapid to be accommodated by creep. It happens for example, as the part of a glacier moves faster than the edges. Horn spire of rock, also known as a pyramidal peak and it is an extreme case of an arête. Plucking/Quarrying where the adhesion of the ice to the rock is stronger than the cohesion of the rock, tarn a post-glacial lake in a cirque. Tunnel valley The tunnel that is formed by erosion of ice. The tunnel valley is what remains of it in the rock when the ice sheet has melted. Movement of the glacier is very slow and its velocity varies from a few centimeters per day to a few meters per day
