1.
Paamiut
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Paamiut, formerly Frederikshåb, is a town in southwestern Greenland in the Sermersooq municipality. Paamiut is located on the coast of Labrador Sea in the end of a small estuary called Kuannersooq. People have lived in the Paamiut area since around 1500 BC, the name Paamiut is Kalaallisut for Those who Reside by the Mouth. The trading post of Frederikshaab was established by Jacob Severins company in 1742, the community prospered on trading fur and whale products. It also became known for its soapstone artists, the town has one of the finest churches in Greenland, built in 1909 from wood in the Norwegian style. Following the warming climatic trends since the 1920s, Paamiut developed a booming cod industry between the 1950s and 1989, when the stock dwindled. In connection with a development plan called G60 Paamiut was chosen as to be the place to live for the population of the former Paamiut municipality. Therefore, the number of living there rose significantly during that period. There is local museum downtown in original buildings from the century, among them a carpenter workshop. The Danish Crown Princely family visited the town as part of a tour of Greenland in summer 2014. As is the case for other towns of western Greenland, the sea is free of ice during the winter, with 1,515 inhabitants as of 2013, it is the eighth-largest town in Greenland, down from the seventh in 2005. Paamiut has been losing population for almost every year in the last two decades, more than 31% relative to 1990 levels, almost 20% relative to 2000, Paamiut is a port of call for the Arctic Umiaq ferry service. In November 2007, the Paamiut Airport was built by Mittarfeqarfiit, connections to Nuuk and Narsarsuaq are served by Air Greenland STOL aircraft
2.
Geographic coordinate system
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A geographic coordinate system is a coordinate system used in geography that enables every location on Earth to be specified by a set of numbers, letters or symbols. The coordinates are chosen such that one of the numbers represents a vertical position. A common choice of coordinates is latitude, longitude and elevation, to specify a location on a two-dimensional map requires a map projection. The invention of a coordinate system is generally credited to Eratosthenes of Cyrene. Ptolemy credited him with the adoption of longitude and latitude. Ptolemys 2nd-century Geography used the prime meridian but measured latitude from the equator instead. Mathematical cartography resumed in Europe following Maximus Planudes recovery of Ptolemys text a little before 1300, in 1884, the United States hosted the International Meridian Conference, attended by representatives from twenty-five nations. Twenty-two of them agreed to adopt the longitude of the Royal Observatory in Greenwich, the Dominican Republic voted against the motion, while France and Brazil abstained. France adopted Greenwich Mean Time in place of local determinations by the Paris Observatory in 1911, the latitude of a point on Earths surface is the angle between the equatorial plane and the straight line that passes through that point and through the center of the Earth. Lines joining points of the same latitude trace circles on the surface of Earth called parallels, as they are parallel to the equator, the north pole is 90° N, the south pole is 90° S. The 0° parallel of latitude is designated the equator, the plane of all geographic coordinate systems. The equator divides the globe into Northern and Southern Hemispheres, the longitude of a point on Earths surface is the angle east or west of a reference meridian to another meridian that passes through that point. All meridians are halves of great ellipses, which converge at the north and south poles, the prime meridian determines the proper Eastern and Western Hemispheres, although maps often divide these hemispheres further west in order to keep the Old World on a single side. The antipodal meridian of Greenwich is both 180°W and 180°E, the combination of these two components specifies the position of any location on the surface of Earth, without consideration of altitude or depth. The grid formed by lines of latitude and longitude is known as a graticule, the origin/zero point of this system is located in the Gulf of Guinea about 625 km south of Tema, Ghana. To completely specify a location of a feature on, in, or above Earth. Earth is not a sphere, but a shape approximating a biaxial ellipsoid. It is nearly spherical, but has an equatorial bulge making the radius at the equator about 0. 3% larger than the radius measured through the poles, the shorter axis approximately coincides with the axis of rotation
3.
Body of water
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A body of water or waterbody is any significant accumulation of water, generally on a planets surface. The term most often refers to oceans, seas, and lakes, a body of water does not have to be still or contained, Rivers, streams, canals, and other geographical features where water moves from one place to another are also considered bodies of water. Most are naturally occurring geographical features, but some are artificial, there are types that can be either. For example, most reservoirs are created by engineering dams, similarly, most harbors are naturally occurring bays, but some harbors have been created through construction. Bodies of water that are navigable are known as waterways, some bodies of water collect and move water, such as rivers and streams, and others primarily hold water, such as lakes and oceans. The term body of water can also refer to a reservoir of water held by a plant, note that there are some geographical features involving water that are not bodies of water, for example waterfalls, geysers and rapids. Arm of the sea - also sea arm, used to describe a sea loch, arroyo - a usually dry creek bed or gulch that temporarily fills with water after a heavy rain, or seasonally. Artificial lake or artificial pond - see reservoir or impoundment, barachois - a lagoon separated from the ocean by a sand bar. Bay - an area of water bordered by land on three sides, similar to, but smaller than a gulf, bayou - a slow-moving stream or a marshy lake. Bight - a large and often only slightly receding bay, or a bend in any geographical feature, billabong - see Oxbow lake, a pond or still body of water created when a river changes course and some water becomes trapped. Boil - see Seep Brook - a small stream, canal - an artificial waterway, usually connected to existing lakes, rivers, or oceans. Channel - the physical confine of a river, slough or ocean consisting of a bed. See also stream bed and strait, earth scientists generally use the term to describe a circular or round inlet with a narrow entrance, though colloquially the term is sometimes used to describe any sheltered bay. Basin - a region of land where water from rain or snowmelt drains downhill into another body of water, such as a river, lake, creek - an inlet of the sea, narrower than a cove. Delta - the location where a river flows into an ocean, sea, estuary, lake, distributary or distributary channel - a stream that branches off and flows away from a main stream channel. Draw - a usually dry creek bed or gulch that temporarily fills with water after a heavy rain, fjord - a submergent landform which has occurred due to glacial activity. Glacier - a large collection of ice or a river that moves slowly down a mountain. Glacial Pothole - see Kettle Gulf - a part of a lake or ocean that extends so that it is surrounded by land on three sides, similar to, but larger than a bay, headland - an area of water bordered by land on three sides
4.
Sea
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A sea is a large body of salt water that is surrounded in whole or in part by land. More broadly, the sea is the system of Earths salty. The sea moderates Earths climate and has important roles in the cycle, carbon cycle. Although the sea has been traveled and explored since prehistory, the scientific study of the sea—oceanography—dates broadly to the British Challenger expedition of the 1870s. Owing to the present state of continental drift, the Northern Hemisphere is now equally divided between land and sea but the South is overwhelmingly oceanic. Salinity in the ocean is generally in a narrow band around 3. 5% by mass, although this can vary in more landlocked waters, near the mouths of large rivers. About 85% of the solids in the sea are sodium chloride. Deep-sea currents are produced by differences in salinity and temperature, surface currents are formed by the friction of waves produced by the wind and by tides, the changes in local sea level produced by the gravity of the Moon and Sun. The direction of all of these is governed by surface and submarine land masses, former changes in sea levels have left continental shelves, shallow areas in the sea close to land. The most diverse areas surround great tropical coral reefs, whaling in the deep sea was once common but whales dwindling numbers prompted international conservation efforts and finally a moratorium on most commercial hunting. Life may have started there and aquatic microbial mats are generally credited with the oxygenation of Earths atmosphere, the sea is an essential aspect of human trade, travel, mineral extraction, and power generation. It is the scene of activities including swimming, diving, surfing. However, population growth, industrialization, and intensive farming have all contributed to marine pollution. Atmospheric carbon dioxide is being absorbed in increasing amounts, lowering its pH in a known as ocean acidification. The shared nature of the sea has made overfishing an increasing problem, both senses of sea date to Old English, the larger sense has required a definite article since Early Middle English. Seas are generally larger than lakes and contain salt water, while the defining elements of size and being bounded are generally used, there is no formally accepted technical definition of sea among oceanographers. In international law, the United Nations Convention on the Law of the Sea states that all the ocean is the sea. Earth is the known planet with seas of liquid water on its surface, although Mars possesses ice caps
5.
Drainage basin
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A drainage basin or catchment area is any area of land where precipitation collects and drains off into a common outlet, such as into a river, bay, or other body of water. Drainage basins connect into other drainage basins at elevations in a hierarchical pattern, with smaller sub-drainage basins. Other terms used to describe drainage basins are catchment, catchment basin, drainage area, river basin and water basin. In closed drainage basins the water converges to a point inside the basin, known as a sink, which may be a permanent lake. The drainage basin acts as a funnel by collecting all the water within the covered by the basin. Each drainage basin is separated topographically from adjacent basins by a perimeter, drainage basins are similar but not identical to hydrologic units, which are drainage areas delineated so as to nest into a multi-level hierarchical drainage system. Hydrologic units are defined to allow multiple inlets, outlets, or sinks, in a strict sense, all drainage basins are hydrologic units but not all hydrologic units are drainage basins. Drainage basins of the oceans and seas of the world. Grey areas are endorheic basins that do not drain to the oceans, the following is a list of the major ocean basins, About 48. 7% of the worlds land drains to the Atlantic Ocean. The two major mediterranean seas of the world also flow to the Atlantic, The Caribbean Sea and Gulf of Mexico basin includes most of the U. S. The Mediterranean Sea basin includes much of North Africa, east-central Africa, Southern, Central, and Eastern Europe, Turkey, and the areas of Israel, Lebanon. Just over 13% of the land in the world drains to the Pacific Ocean, the Indian Oceans drainage basin also comprises about 13% of Earths land. It drains the eastern coast of Africa, the coasts of the Red Sea and the Persian Gulf, the Indian subcontinent, Burma, antarctica comprises approximately eight percent of the Earths land. The five largest river basins, from largest to smallest, are the basins of the Amazon, the Río de la Plata, the Congo, the Nile, and the Mississippi. The three rivers that drain the most water, from most to least, are the Amazon, Ganga, endorheic drainage basins are inland basins that do not drain to an ocean. Around 18% of all land drains to endorheic lakes or seas or sinks, the largest of these consists of much of the interior of Asia, which drains into the Caspian Sea, the Aral Sea, and numerous smaller lakes. Some of these, such as the Great Basin, are not single drainage basins but collections of separate, in endorheic bodies of standing water where evaporation is the primary means of water loss, the water is typically more saline than the oceans. An extreme example of this is the Dead Sea, drainage basins have been historically important for determining territorial boundaries, particularly in regions where trade by water has been important
6.
Canada
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Canada is a country in the northern half of North America. Canadas border with the United States is the worlds longest binational land border, the majority of the country has a cold or severely cold winter climate, but southerly areas are warm in summer. Canada is sparsely populated, the majority of its territory being dominated by forest and tundra. It is highly urbanized with 82 per cent of the 35.15 million people concentrated in large and medium-sized cities, One third of the population lives in the three largest cities, Toronto, Montreal and Vancouver. Its capital is Ottawa, and other urban areas include Calgary, Edmonton, Quebec City, Winnipeg. Various aboriginal peoples had inhabited what is now Canada for thousands of years prior to European colonization. Pursuant to the British North America Act, on July 1,1867, the colonies of Canada, New Brunswick and this began an accretion of provinces and territories to the mostly self-governing Dominion to the present ten provinces and three territories forming modern Canada. With the Constitution Act 1982, Canada took over authority, removing the last remaining ties of legal dependence on the Parliament of the United Kingdom. Canada is a parliamentary democracy and a constitutional monarchy, with Queen Elizabeth II being the head of state. The country is officially bilingual at the federal level and it is one of the worlds most ethnically diverse and multicultural nations, the product of large-scale immigration from many other countries. Its advanced economy is the eleventh largest in the world, relying chiefly upon its abundant natural resources, Canadas long and complex relationship with the United States has had a significant impact on its economy and culture. Canada is a country and has the tenth highest nominal per capita income globally as well as the ninth highest ranking in the Human Development Index. It ranks among the highest in international measurements of government transparency, civil liberties, quality of life, economic freedom, Canada is an influential nation in the world, primarily due to its inclusive values, years of prosperity and stability, stable economy, and efficient military. While a variety of theories have been postulated for the origins of Canada. In 1535, indigenous inhabitants of the present-day Quebec City region used the word to direct French explorer Jacques Cartier to the village of Stadacona, from the 16th to the early 18th century Canada referred to the part of New France that lay along the St. Lawrence River. In 1791, the area became two British colonies called Upper Canada and Lower Canada collectively named The Canadas, until their union as the British Province of Canada in 1841. Upon Confederation in 1867, Canada was adopted as the name for the new country at the London Conference. The transition away from the use of Dominion was formally reflected in 1982 with the passage of the Canada Act, later that year, the name of national holiday was changed from Dominion Day to Canada Day
7.
Greenland
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Greenland is an autonomous constituent country within the Danish Realm between the Arctic and Atlantic Oceans, east of the Canadian Arctic Archipelago. Though physiographically a part of the continent of North America, Greenland has been politically and culturally associated with Europe for more than a millennium. The majority of its residents are Inuit, whose ancestors began migrating from the Canadian mainland in the 13th century, Greenland is the worlds largest island. Three-quarters of Greenland is covered by the permanent ice sheet outside Antarctica. With a population of about 56,480, it is the least densely populated country in the world, the Arctic Umiaq Line ferry acts as a lifeline for western Greenland, connecting the various cities and settlements. Greenland has been inhabited off and on for at least the last 4,500 years by Arctic peoples whose forebears migrated there from what is now Canada, Norsemen settled the uninhabited southern part of Greenland beginning in the 10th century, and Inuit peoples arrived in the 13th century. The Norse colonies disappeared in the late 15th century, soon after their demise, beginning in 1499, the Portuguese briefly explored and claimed the island, naming it Terra do Lavrador. In the early 18th century, Scandinavian explorers reached Greenland again, to strengthen trading and power, Denmark-Norway affirmed sovereignty over the island. Greenland was settled by Vikings more than a thousand years ago, Vikings set sail from Greenland and Iceland, discovering North America nearly 500 years before Columbus reached Caribbean islands. Though under continuous influence of Norway and Norwegians, Greenland was not formally under the Norwegian crown until 1262, the Kingdom of Norway was extensive and a military power until the mid-14th century. Thus, the two kingdoms resources were directed at creating Copenhagen, Norway became the weaker part and lost sovereignty over Greenland in 1814 when the union was dissolved. Greenland became a Danish colony in 1814, and was made a part of the Danish Realm in 1953 under the Constitution of Denmark, in 1973, Greenland joined the European Economic Community with Denmark. However, in a referendum in 1982, a majority of the population voted for Greenland to withdraw from the EEC which was effected in 1985, Greenland contains the worlds largest and most northernly national park, Northeast Greenland National Park. Greenland is divided into four municipalities - Sermersooq, Kujalleq, Qaasuitsup and it also retains control of monetary policy, providing an initial annual subsidy of DKK3.4 billion, which is planned to diminish gradually over time. Greenland expects to grow its economy based on increased income from the extraction of natural resources, the capital, Nuuk, held the 2016 Arctic Winter Games. At 70%, Greenland has one of the highest shares of renewable energy in the world, the early Viking settlers named the island as Greenland. In the Icelandic sagas, the Norwegian-born Icelander Erik the Red was said to be exiled from Iceland for manslaughter, along with his extended family and his thralls, he set out in ships to explore an icy land known to lie to the northwest. After finding an area and settling there, he named it Grœnland
8.
French language
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French is a Romance language of the Indo-European family. It descended from the Vulgar Latin of the Roman Empire, as did all Romance languages, French has evolved from Gallo-Romance, the spoken Latin in Gaul, and more specifically in Northern Gaul. Its closest relatives are the other langues doïl—languages historically spoken in northern France and in southern Belgium, French was also influenced by native Celtic languages of Northern Roman Gaul like Gallia Belgica and by the Frankish language of the post-Roman Frankish invaders. Today, owing to Frances past overseas expansion, there are numerous French-based creole languages, a French-speaking person or nation may be referred to as Francophone in both English and French. French is a language in 29 countries, most of which are members of la francophonie. As of 2015, 40% of the population is in Europe, 35% in sub-Saharan Africa, 15% in North Africa and the Middle East, 8% in the Americas. French is the fourth-most widely spoken mother tongue in the European Union, 1/5 of Europeans who do not have French as a mother tongue speak French as a second language. As a result of French and Belgian colonialism from the 17th and 18th century onward, French was introduced to new territories in the Americas, Africa, most second-language speakers reside in Francophone Africa, in particular Gabon, Algeria, Mauritius, Senegal and Ivory Coast. In 2015, French was estimated to have 77 to 110 million native speakers, approximately 274 million people are able to speak the language. The Organisation internationale de la Francophonie estimates 700 million by 2050, in 2011, Bloomberg Businessweek ranked French the third most useful language for business, after English and Standard Mandarin Chinese. Under the Constitution of France, French has been the language of the Republic since 1992. France mandates the use of French in official government publications, public education except in specific cases, French is one of the four official languages of Switzerland and is spoken in the western part of Switzerland called Romandie, of which Geneva is the largest city. French is the language of about 23% of the Swiss population. French is also a language of Luxembourg, Monaco, and Aosta Valley, while French dialects remain spoken by minorities on the Channel Islands. A plurality of the worlds French-speaking population lives in Africa and this number does not include the people living in non-Francophone African countries who have learned French as a foreign language. Due to the rise of French in Africa, the total French-speaking population worldwide is expected to reach 700 million people in 2050, French is the fastest growing language on the continent. French is mostly a language in Africa, but it has become a first language in some urban areas, such as the region of Abidjan, Ivory Coast and in Libreville. There is not a single African French, but multiple forms that diverged through contact with various indigenous African languages, sub-Saharan Africa is the region where the French language is most likely to expand, because of the expansion of education and rapid population growth
9.
Danish language
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There are also minor Danish-speaking communities in Norway, Sweden, Spain, the United States, Canada, Brazil and Argentina. Due to immigration and language shift in urban areas, around 15–20% of the population of Greenland speak Danish as their home language. Along with the other North Germanic languages, Danish is a descendant of Old Norse, until the 16th century, Danish was a continuum of dialects spoken from Schleswig to Scania with no standard variety or spelling conventions. With the Protestant Reformation and the introduction of printing, a language was developed which was based on the educated Copenhagen dialect. It spread through use in the system and administration though German. Today, traditional Danish dialects have all but disappeared, though there are variants of the standard language. The main differences in language are between generations, with youth language being particularly innovative, Danish has a very large vowel inventory comprising 27 phonemically distinctive vowels, and its prosody is characterized by the distinctive phenomenon stød, a kind of laryngeal phonation type. The grammar is moderately inflective with strong and weak conjugations and inflections, nouns and demonstrative pronouns distinguish common and neutral gender. As in English, Danish only has remnants of a case system, particularly in the pronouns. Its syntax is V2, with the verb always occupying the second slot in the sentence. Danish is a Germanic language of the North Germanic branch, other names for this group are the Nordic or Scandinavian languages. Along with Swedish, Danish descends from the Eastern dialects of the Old Norse language, Scandinavian languages are often considered a dialect continuum, where there are no sharp dividing lines between the different vernacular languages. Like Norwegian and Swedish, Danish was significantly influenced by Low German in the Middle Ages, Danish itself can be divided into three main dialect areas, West Danish, Insular Danish, and East Danish. Danish is largely mutually intelligible with Norwegian and Swedish, both Swedes and Danes also understand Norwegian better than they understand each others languages. By the 8th century, the common Germanic language of Scandinavia, Proto-Norse, had some changes. This language was called the Danish tongue, or Norse language. Norse was written in the alphabet, first with the elder futhark. From the 7th century the common Norse language began to undergo changes that did not spread to all of Scandinavia, most of the changes separating East Norse from West Norse started as innovations in Denmark, that spread through Scania into Sweden and by maritime contact to southern Norway
10.
Atlantic Ocean
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The Atlantic Ocean is the second largest of the worlds oceans with a total area of about 106,460,000 square kilometres. It covers approximately 20 percent of the Earths surface and about 29 percent of its surface area. It separates the Old World from the New World, the Atlantic Ocean occupies an elongated, S-shaped basin extending longitudinally between Eurasia and Africa to the east, and the Americas to the west. The Equatorial Counter Current subdivides it into the North Atlantic Ocean, in contrast, the term Atlantic originally referred specifically to the Atlas Mountains in Morocco and the sea off the Strait of Gibraltar and the North African coast. The Greek word thalassa has been reused by scientists for the huge Panthalassa ocean that surrounded the supercontinent Pangaea hundreds of years ago. The term Aethiopian Ocean, derived from Ancient Ethiopia, was applied to the Southern Atlantic as late as the mid-19th century, many Irish or British people refer to the United States and Canada as across the pond, and vice versa. The Black Atlantic refers to the role of ocean in shaping black peoples history. Irish migration to the US is meant when the term The Green Atlantic is used, the term Red Atlantic has been used in reference to the Marxian concept of an Atlantic working class, as well as to the Atlantic experience of indigenous Americans. Correspondingly, the extent and number of oceans and seas varies, the Atlantic Ocean is bounded on the west by North and South America. It connects to the Arctic Ocean through the Denmark Strait, Greenland Sea, Norwegian Sea, to the east, the boundaries of the ocean proper are Europe, the Strait of Gibraltar and Africa. In the southeast, the Atlantic merges into the Indian Ocean, the 20° East meridian, running south from Cape Agulhas to Antarctica defines its border. In the 1953 definition it extends south to Antarctica, while in later maps it is bounded at the 60° parallel by the Southern Ocean, the Atlantic has irregular coasts indented by numerous bays, gulfs, and seas. Including these marginal seas the coast line of the Atlantic measures 111,866 km compared to 135,663 km for the Pacific. Including its marginal seas, the Atlantic covers an area of 106,460,000 km2 or 23. 5% of the ocean and has a volume of 310,410,900 km3 or 23. 3%. Excluding its marginal seas, the Atlantic covers 81,760,000 km2 and has a volume of 305,811,900 km3, the North Atlantic covers 41,490,000 km2 and the South Atlantic 40,270,000 km2. The average depth is 3,646 m and the maximum depth, the bathymetry of the Atlantic is dominated by a submarine mountain range called the Mid-Atlantic Ridge. It runs from 87°N or 300 km south of the North Pole to the subantarctic Bouvet Island at 42°S, the MAR divides the Atlantic longitudinally into two halves, in each of which a series of basins are delimited by secondary, transverse ridges. The MAR reaches above 2000 m along most of its length, the MAR is a barrier for bottom water, but at these two transform faults deep water currents can pass from one side to the other
11.
Labrador Peninsula
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The Labrador Peninsula is a large peninsula in eastern Canada. It is bounded by the Hudson Bay to the west, the Hudson Strait to the north, the Labrador Sea to the east, and it has an area of 1,400,000 km2. The peninsula is surrounded by sea on all sides except for the southwest where it connects to the mainland, the northwestern part of the Labrador Peninsula is shaped as a lesser peninsula, the Ungava Peninsula, surrounded by Hudson Bay, the Hudson Strait, and Ungava Bay. The northernmost point of the Ungava Peninsula, Cape Wolstenholme, also serves as the northernmost point of the Labrador Peninsula, the peninsula is a plateau threaded by river valleys. The mountains also host Torngat Mountains National Park, the national park of Canada on the Labrador Peninsula. The park is located in the province of Newfoundland and Labrador and it is widely accepted that the peninsula is named after Portuguese explorer João Fernandes Lavrador. He was granted a patent by King Manuel I of Portugal in 1499 which gave him the right to explore that part of the Atlantic Ocean as set out in the Treaty of Tordesillas, together with Pêro de Barcelos, he first sighted Labrador in 1498. Fernandes charted the coasts of Southwestern Greenland and of adjacent Northeastern North America around 1498 and gave notice of them in Portugal and his landowner status allowed him to use the title lavrador, Portuguese for farmer or landholder. Fernandes actually gave the name of Terra do Lavrador to Greenland which was the first land he sighted, but eventually the name was spread to all areas and finally was set for Labrador
12.
Continental shelf
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The continental shelf is an underwater landmass which extends from a continent, resulting in an area of relatively shallow water known as a shelf sea. Much of the shelves were exposed during glacial periods and interglacial periods, the shelf surrounding an island is known as an insular shelf. The continental margin, between the shelf and the abyssal plain, comprises a steep continental slope followed by the flatter continental rise. Sediment from the continent above cascades down the slope and accumulates as a pile of sediment at the base of the slope, extending as far as 500 km from the slope, it consists of thick sediments deposited by turbidity currents from the shelf and slope. The continental rises gradient is intermediate between the slope and the shelf, on the order of 0. 5–1°, the largest shelf – the Siberian Shelf in the Arctic Ocean – stretches to 1,500 kilometers in width. The South China Sea lies over another extensive area of shelf, the Sunda Shelf, which joins Borneo, Sumatra. Other familiar bodies of water that overlie continental shelves are the North Sea, the average width of continental shelves is about 80 km. The depth of the shelf also varies, but is limited to water shallower than 150 m. The slope of the shelf is quite low, on the order of 0. 5°, vertical relief is also minimal. Though the continental shelf is treated as a province of the ocean, it is not part of the deep ocean basin proper. Passive continental margins such as most of the Atlantic coasts have wide and shallow shelves, active continental margins have narrow, relatively steep shelves, due to frequent earthquakes that move sediment to the deep sea. The shelf usually ends at a point of increasing slope, the sea floor below the break is the continental slope. Below the slope is the rise, which finally merges into the deep ocean floor. The continental shelf and the slope are part of the continental margin, the shelf area is commonly subdivided into the inner continental shelf, mid continental shelf, and outer continental shelf, each with their specific geomorphology and marine biology. The character of the shelf changes dramatically at the shelf break, with a few exceptions, the shelf break is located at a remarkably uniform depth of roughly 140 m, this is likely a hallmark of past ice ages, when sea level was lower than it is now. The continental slope is steeper than the shelf, the average angle is 3°. The slope is cut with submarine canyons. The physical mechanisms involved in forming these canyons were not well understood until the 1960s, the continental shelves are covered by terrigenous sediments, that is, those derived from erosion of the continents
13.
Baffin Bay
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Baffin Bay, located between Baffin Island and the southwest coast of Greenland, is a marginal sea of the North Atlantic Ocean. It is connected to the Atlantic via Davis Strait and the Labrador Sea, the narrower Nares Strait connects Baffin Bay with the Arctic Ocean. The bay is not navigable most of the year because of the ice cover and high density of floating ice, however, a polynya of about 80,000 km2, known as the North Water, opens in summer on the north near Smith Sound. Most of the life of the bay is concentrated near that region. The International Hydrographic Organization defines the limits of Baffin Bay as follows, a line from Cape Sheridan, Grant Land to Cape Bryant, Greenland. The parallel of 70° North between Greenland and Baffin Land, the Eastern limits of the North-West Passages. The area of the bay has been inhabited since c. 500 BC, around AD1200, the initial Dorset settlers were replaced by the Thule peoples. Recent excavations also suggest that the Norse colonization of the Americas reached the shores of Baffin Bay sometime between the 10th and 14th centuries, the English explorer John Davis was the first recorded European to enter the bay, arriving in 1585. In 1612, a group of English merchants formed the Company of Merchants of London and their governor Thomas Smythe organized five expeditions to explore the northern coasts of Canada in search of a maritime passage to the Far East. Henry Hudson and Thomas Buttons explored Hudson Bay, William Gibbons Labrador, and Robert Bylot Hudson Strait, aboard the Discovery, Baffin charted the area and named Lancaster, Smith, and Jones Sounds after members of his company. By the completion of his 1616 voyage, Baffin held out no hope of an ice-free passage, over time, his account came to be doubted until it was confirmed by John Rosss 1818 voyage. More advanced scientific studies followed in 1928, in the 1930s and after World War II by Danish, currently, there are a few Inuit settlements on the Canadian coast of the bay, including Arctic Bay, Pond Inlet and Clyde River. Those settlements are accessed and supplied by air and annual sealifts, in 1975, a town was built at Nanisivik to support lead and zinc production at the Nanisivik Mine—the first Canadian mine in the Arctic. The mine was closed in 2002 due to declining resources and metal prices, whereas the town still has a functional seaport and an airport, as of the 2006 census, it has an official population of zero. Baffin Bay was the epicenter of a 7.3 magnitude earthquake in 1933 and this is the largest known earthquake north of the Arctic Circle. It caused no damage because of its location and the small number of the nearby onshore communities. The northwestern part of the bay remains one of the most seismically active regions in eastern Canada, five earthquakes of magnitude 6 have occurred here since 1933. The latest strong earthquake occurred on 15 April 2010 and had the magnitude of 5.1, Baffin Bay is an arm of the Atlantic Ocean bounded by the Baffin Island in the west, Greenland in the east, and Ellesmere Island in the north
14.
Davis Strait
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Davis Strait is a northern arm of the Labrador Sea. It lies between mid-western Greenland and Nunavut, Canadas Baffin Island, to the north is Baffin Bay. The strait was named for the English explorer John Davis, who explored the area seeking a Northwest Passage. By the 1650s it was used for whale hunting, the International Hydrographic Organization defines the limits of the Davis Strait as follows, On the North. The Southern limit of Baffin Bay, the parallel of 60° North between Greenland and Labrador. The Eastern limit of the Northwestern Passages South of 70° North, the Davis Strait is underlain by complex geological features of buried grabens and ridges, probably formed by strike-slip faulting during Paleogene times about 45 million to 62 million years ago. The strike-slip faulting transferred plate-tectonic motions in the Labrador Sea to Baffin Bay and it is the worlds broadest strait. With a water depth of one and two thousand meters the strait is substantially shallower than the Labrador Sea to the south or Baffin Bay to the north. The strait is famous for its fierce tides that can range from 30 to 60 ft and this has led the Greenlands minister and provincial council to offer a large number of off-shore concessions to potential hydrocarbon extraction. The largest concessions areas are located in seas west of Greenland, primarily the Davis Strait and Baffin Bay, june 2005 Satellite photograph of Davis Strait from MODIS, showing meltwater ponds
15.
North American Plate
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The North American Plate is a tectonic plate covering most of North America, Greenland, Cuba, the Bahamas, extreme northeastern Russia, and parts of Iceland and the Azores. It extends eastward to the Mid-Atlantic Ridge and westward to the Chersky Range in eastern Siberia, the plate includes both continental and oceanic crust. The interior of the continental landmass includes an extensive granitic core called a craton. Along most of the edges of this craton are fragments of material called terranes. It is thought that much of North America west of the Rocky Mountains is composed of such terranes, the parallel Septentrional and Enriquillo-Plantain Garden faults, which run through the island of Hispaniola and bound the Gonâve Microplate, are also a part of the boundary. On the northerly boundary is a continuation of the Mid-Atlantic ridge called the Gakkel Ridge, the rest of the boundary in the far northwestern part of the plate extends into Siberia. On its western edge, the Farallon Plate has been subducting under the North American Plate since the Jurassic Period, the Juan de Fuca, Explorer, Gorda, Rivera, Cocos and Nazca plates are remnants of the Farallon Plate. The boundary along the Gulf of California is complex and it is generally accepted that a piece of the North American Plate was broken off and transported north as the East Pacific Rise propagated northward, creating the Gulf of California. A few hotspots are thought to exist below the North American Plate, the most notable hotspots are the Yellowstone, Raton, and Anahim hotspots. The Yellowstone and Anahim hotspots are thought to have first arrived during the Miocene period and are still geologically active, for the most part, the North American Plate moves in roughly a southwest direction away from the Mid-Atlantic Ridge. One recent study suggests that a convective current is propelling the plate. Geologic timeline of Western North America New Madrid Seismic Zone - an ancient intraplate fault zone within the North American Plate, notable as early as 1699 Notes
16.
Turbidity current
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A turbidity current is most typically an underwater current of usually rapidly moving, sediment-laden water moving down a slope. Turbidity currents can occur in other fluids besides water. In the most typical case of oceanic turbidity currents, sediment laden waters situated over sloping ground will flow down-hill because they have a higher density than the adjacent waters. The driving force behind a turbidity current is gravity acting on the density of the sediments temporarily suspended within a fluid. These semi-suspended solids make the density of the sediment bearing water greater than that of the surrounding. As such currents flow, they often have a snow-balling-effect, as they stir up the ground over which they flow and their passage leaves the ground over which they flow scoured and eroded. Once an oceanic turbidity current reaches the waters of the flatter area of the abyssal plain. The sedimentary deposit of a turbidity current is called a turbidite, examples of turbidity currents involving other fluid mediums besides liquid water include, avalanches, lahars, pyroclastic flows, and lava flows. Seafloor turbidity currents are often the result of sediment-laden river outflows and they are characterized by a well-defined advance-front, also known as the currents head, and are followed by the currents main body. In terms of the often observed and more familiar above sea-level phenomenon. With an increasing continental shelf slope, current velocity increases, as the velocity of the flow increases, turbulence increases, the increase in sediment also adds to the density of the current, and thus its velocity even further. Turbidity currents are traditionally defined as those sediment gravity flows in which sediment is suspended by fluid turbulence, however, the term turbidity current was adopted to describe a natural phenomenon whose exact nature is often unclear. Definitions are further complicated by an understanding of the turbulence structure within turbidity currents. A turbidity current is a current in which the interstitial fluid is a liquid. The average concentration of suspended sediment for most river water enters the ocean is much lower than the sediment concentration needed for entry as a hyperpycnal plume. Although some rivers can often have high sediment load that can create a continuous hyperpycnal plume, such as the Haile River. The sediment concentration needed to produce a plume in marine water is 35 to 45 kg/m³. Most rivers produce hyperpycnal flows only during events, such as storms, floods, glacier outbursts, dam breaks
17.
Northwest Atlantic Mid-Ocean Channel
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Contrary to most other such systems which fan away from the main channel, numerous tributaries run into the NAMOC and end there. The density of those tributaries is the highest near the Labrador Peninsula, most topography data on the NAMOC originate from wide-range sonar scans. With a total length of about 3,800 km, NAMOC is one of the longest underwater channels in the world and it is 100–200 m deep and 2–5 km wide at the channel floor. The rising levees of the NAMOC often hinder confluence of some tributaries and its western levee rises some 100 m above the eastern one. This asymmetry is attributed to the Coriolis effect affecting the turbidity currents, the levee is absent in some parts of the NAMOC, for example between 56°N and 57°N, due to the local side-flows of sand. The meandering of the NAMOC is relatively small compared to other underwater channels and it is more developed in the northern part with a period increasing from 25 km between 59°45N and 56°N to 50 km between 56°N and 54°30N. The channel becomes on average more straight towards the south, but it still contains abrupt turns due to local seamounts sea bed fractures
18.
North Atlantic Deep Water
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North Atlantic Deep Water is a deep water mass formed in the North Atlantic Ocean. Thermohaline circulation of the oceans involves the flow of warm surface waters from the southern hemisphere into the North Atlantic. Water flowing northward becomes modified through evaporation and mixing with water masses. When this water reaches the North Atlantic it cools and sinks through convection, due to its decreased temperature, NADW is the outflow of this thick deep layer, which can be detected by its high salinity, high oxygen content, nutrient minima, and chlorofluorocarbons. CFCs are anthropogenic substances that enter the surface of the ocean from gas exchange with the atmosphere and this distinct composition allows its path to be traced as it mixes with Circumpolar Deep Water, which in turn fills the deep Indian Ocean and part of the South Pacific. NADW has a temperature of 2-4 °C with a salinity of 34. 9-35.0 psu found at a depth between 1500 and 4000m, the NADW is a complex of several water masses formed by deep convection and also by overflow of dense water across the Greenland-Iceland-Scotland Ridge. The upper layers are formed by deep open ocean convection during winter, Labrador Sea Water, formed in the Labrador Sea can reach depths of 2000 m as dense water sinks downward. Classical Labrador Sea Water production is dependent on preconditioning of water in the Labrador Sea from the year. During a positive NAO phase, conditions exist for strong winter storms to develop and these storms freshen the surface water, and their winds increase cyclonic flow, which allows denser waters to sink. As a result, the temperature, salinity, and density vary yearly, in some years these conditions do not exist and CLSW is not formed. CLSW has characteristic temperature of 3 °C, salinity of 34.88 psu. Another component of LSW is the Upper Labrador Sea Water, ULSW forms at a density lower than CLSW and has a CFC maximum between 1200 and 1500 m in the subtropical North Atlantic. Eddies of cold less saline ULSW have similar densities of warmer water and flow along the DWBC. The ULSW eddies erode rapidly as they mix laterally with this warmer saltier water, the lower waters mass of NADW form from overflow of the Greenland-Iceland-Scotland Ridge. They are Iceland-Scotland Overflow Water and Denmark Strait Overflow Water, the formation of both of these waters involves the conversion of warm salty northward flowing surface waters to cold dense deep waters behind the Greenland-Iceland-Scotland Ridge. Water flow from the North Atlantic current enters the Arctic Ocean through the Norwegian Current which splits into the Fram Strait, Water from the Fram Strait recirculates, reaching a density of DSOW, sinks, and flows towards the Denmark Strait. Water flowing into the Barent Sea feeds ISOW, ISOW enters the eastern North Atlantic over the Iceland-Scotland Ridge through the Faeroe Bank Channel at a depth of 850 m, with some water flowing over the shallower Iceland-Faeroe Rise. ISOW has a low CFC concentrations and it has been estimated from these concentrations that ISOW resides behind the ridge for 45 years and this water is less dense than and lays above it as it flows cyclonically in the Irminger Basin
19.
World Ocean
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The unity and continuity of the World Ocean, with relatively free interchange among its parts, is of fundamental importance to oceanography. In turn, oceanic waters are interspersed by many smaller seas, gulfs, a global ocean has existed in one form or another on Earth for eons, and the notion dates back to classical antiquity in the form of Oceanus. The contemporary concept of the World Ocean was coined in the early 20th century by the Russian oceanographer Yuly Shokalsky to refer to the ocean that covers. If viewed from the pole of Earth, the Atlantic, Indian. Farther north, the Atlantic opens into the Arctic Ocean, which is connected to the Pacific by the Bering Strait, the Pacific Ocean, the largest of the oceans, also reaches northward from the Southern Ocean to the Arctic Ocean. It spans the gap between Australia and Asia, and the Americas, the Pacific Ocean meets the Atlantic Ocean south of South America at Cape Horn. The Atlantic Ocean, the second largest, extends from the Southern Ocean between the Americas, and Africa and Europe, to the Arctic Ocean, the Atlantic Ocean meets the Indian Ocean south of Africa at Cape Agulhas. The Indian Ocean, the third largest, extends northward from the Southern Ocean to India, the Indian Ocean joins the Pacific Ocean to the east, near Australia. The Arctic Ocean is the smallest of the five and it joins the Atlantic Ocean near Greenland and Iceland and joins the Pacific Ocean at the Bering Strait. It overlies the North Pole, touching North America in the Western Hemisphere, the Arctic Ocean is partially covered in sea ice, the extent of which varies according to the season. The Southern Ocean is an ocean surrounding Antarctica, dominated by the Antarctic Circumpolar Current. The Southern Ocean is partially covered in sea ice, the extent of which according to the season. The Southern Ocean is the second smallest of the five named oceans, plate tectonics, post-glacial rebound and sea level rise continually change the coastline and structure of the world ocean. Superocean World Ocean Atlas Chekin, L.2002, the world ocean in medieval cartography. Vavilov Institute of the History of Science and Technology of the Russian Academy of Sciences, the Columbia Encyclopedia, 6th ed.2003. New York, Columbia University Press, also, Danabasoglu, Gokhan, McWilliams, the role of mesoscale tracer transports in the global ocean circulation. Boyer, Timothy P. and Stephens, Cathy, warming of the world ocean, abstract, article. Maps of the world ocean
20.
Paleocene
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The Paleocene or Palaeocene, the old recent, is a geologic epoch that lasted from about 66 to 56 million years ago. It is the first epoch of the Paleogene Period in the modern Cenozoic Era, as with many geologic periods, the strata that define the epochs beginning and end are well identified, but the exact ages remain uncertain. The Paleocene Epoch brackets two major events in Earths history and it started with the mass extinction event at the end of the Cretaceous, known as the Cretaceous–Paleogene boundary. This was a marked by the demise of non-avian dinosaurs, giant marine reptiles and much other fauna. The die-off of the dinosaurs left unfilled ecological niches worldwide, the Paleocene ended with the Paleocene–Eocene Thermal Maximum, a geologically brief interval characterized by extreme changes in climate and carbon cycling. The name Paleocene comes from Ancient Greek and refers to the old new fauna that arose during the epoch. The K–Pg boundary that marks the separation between Cretaceous and Paleocene is visible in the record of much of the Earth by a discontinuity in the fossil fauna. There is also evidence of abrupt changes in flora and fauna. There is some evidence that a substantial but very short-lived climatic change may have happened in the early decades of the Paleocene. The end of the Paleocene was also marked by a time of major change, the Paleocene–Eocene Thermal Maximum upset oceanic and atmospheric circulation and led to the extinction of numerous deep-sea benthic foraminifera and a major turnover in mammals on land. The Paleocene is divided into three stages, the Danian, the Selandian and the Thanetian, as shown in the table above, additionally, the Paleocene is divided into six Mammal Paleogene zones. The early Paleocene was cooler and dryer than the preceding Cretaceous, in many ways, the Paleocene continued processes that had begun during the late Cretaceous Period. During the Paleocene, the continued to drift toward their present positions. The Laramide orogeny of the late Cretaceous continued to uplift the Rocky Mountains in the American west, africa was heading north towards Europe, slowly closing the Tethys Ocean, and India began its migration to Asia that would lead to a tectonic collision and the formation of the Himalayas. The inland seas in North America and Europe had receded by the beginning of the Paleocene, making way for new land-based flora, warm seas circulated throughout the world, including the poles. The earliest Paleocene featured a low diversity and abundance of marine life, tropical conditions gave rise to abundant marine life, including coral reefs. With the demise of marine reptiles at the end of the Cretaceous, at the end of the Cretaceous, the ammonites and many species of foraminifera became extinct. Marine fauna also came to resemble modern fauna, with only the marine mammals, terrestrial Paleocene strata immediately overlying the K–Pg boundary is in places marked by a fern spike, a bed especially rich in fern fossils
21.
Sedimentary basin
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Sedimentary basins are regions of Earth of long-term subsidence creating accommodation space for infilling by sediments. Sedimentary basins occur in diverse geological settings usually associated with tectonic activity. Basins formed in different plate tectonic regimes vary in their preservation potential, on oceanic crust, basins are likely to be subducted, while marginal continental basins may be partially preserved, and intracratonic basins have a high probability of preservation. As the sediments are buried, they are subjected to increasing pressure, a number of basins formed in extensional settings can undergo inversion which has accounted for a number of the economically viable oil reserves on earth which were formerly basins. Sedimentary basins form primarily in convergent, divergent and transform settings, convergent boundaries create foreland basins through tectonic compression of oceanic and continental crust during lithospheric flexure. Tectonic extension at divergent boundaries where continental rifting is occurring can create a nascent ocean basin leading to either an ocean or the failure of the rift zone. If the lithosphere is caused to stretch horizontally, by such as ridge-push or trench-pull. The lower, hotter part of the lithosphere will flow away from the main area being stretched, whilst the upper, cooler and more brittle crust will tend to fault. The combined effect of two mechanisms is for the Earths surface in the area of extension to subside, creating a geographical depression which is then often infilled with water and/or sediments. An example of a basin caused by lithospheric stretching is the North Sea – also an important location for significant hydrocarbon reserves, another such feature is the Basin and Range Province which covers most of the USA state of Nevada, forming a series of horst and graben structures. Another expression of lithospheric stretching results in the formation of basins with central ridges, The Red Sea is in fact an incipient ocean. The mouth of the Red Sea is also a triple junction where the Indian Ocean Ridge, Red Sea Rift. This is the place on the planet where such a triple junction in oceanic crust is exposed subaerially. The reason for this is twofold, due to a high thermal buoyancy of the junction, if a load is placed on the lithosphere, it will tend to flex in the manner of an elastic plate. The magnitude of the lithospheric flexure is a function of the load and the flexural rigidity of the lithosphere. Flexural rigidity is in itself, a function of the mineral composition, thermal regime. The nature of the load is varied, for instance, the Hawaiian Islands chain of volcanic edifices has sufficient mass to cause deflection in the lithosphere. Deformation of the lithosphere in the plane of the earth occurs as a result of near horizontal maximum and minimum principal stresses, the resulting zones of subsidence are known as strike-slip or pull-apart basins
22.
Cretaceous
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The Cretaceous is a geologic period and system that spans 79 million years from the end of the Jurassic Period 145 million years ago to the beginning of the Paleogene Period 66 Mya. It is the last period of the Mesozoic Era, the Cretaceous Period is usually abbreviated K, for its German translation Kreide. The Cretaceous was a period with a warm climate, resulting in high eustatic sea levels that created numerous shallow inland seas. These oceans and seas were populated with now-extinct marine reptiles, ammonites and rudists, during this time, new groups of mammals and birds, as well as flowering plants, appeared. The Cretaceous ended with a mass extinction, the Cretaceous–Paleogene extinction event, in which many groups, including non-avian dinosaurs, pterosaurs. The end of the Cretaceous is defined by the abrupt Cretaceous–Paleogene boundary, the name Cretaceous was derived from Latin creta, meaning chalk. The Cretaceous is divided into Early and Late Cretaceous epochs, or Lower and Upper Cretaceous series, in older literature the Cretaceous is sometimes divided into three series, Neocomian, Gallic and Senonian. A subdivision in eleven stages, all originating from European stratigraphy, is now used worldwide, in many parts of the world, alternative local subdivisions are still in use. As with other geologic periods, the rock beds of the Cretaceous are well identified. No great extinction or burst of diversity separates the Cretaceous from the Jurassic and this layer has been dated at 66.043 Ma. A140 Ma age for the Jurassic-Cretaceous boundary instead of the usually accepted 145 Ma was proposed in 2014 based on a study of Vaca Muerta Formation in Neuquén Basin. Víctor Ramos, one of the authors of the study proposing the 140 Ma boundary age sees the study as a first step toward formally changing the age in the International Union of Geological Sciences, due to the high sea level there was extensive space for such sedimentation. Because of the young age and great thickness of the system. Chalk is a type characteristic for the Cretaceous. It consists of coccoliths, microscopically small calcite skeletons of coccolithophores, the group is found in England, northern France, the low countries, northern Germany, Denmark and in the subsurface of the southern part of the North Sea. Chalk is not easily consolidated and the Chalk Group still consists of sediments in many places. The group also has other limestones and arenites, among the fossils it contains are sea urchins, belemnites, ammonites and sea reptiles such as Mosasaurus. In southern Europe, the Cretaceous is usually a marine system consisting of competent limestone beds or incompetent marls
23.
Seafloor spreading
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Seafloor spreading is a process that occurs at mid-ocean ridges, where new oceanic crust is formed through volcanic activity and then gradually moves away from the ridge. Seafloor spreading helps explain continental drift in the theory of plate tectonics, basaltic magma rises up the fractures and cools on the ocean floor to form new seabed. Older rocks will be farther away from the spreading zone while younger rocks will be found nearer to the spreading zone. Additionally spreading rates determine if the ridge is a fast, intermediate, as a general rule, fast ridges see spreading rate of more than 9 cm/year. Intermediate ridges have a rate of 4-9 cm/year while slow spreading ridges have a rate less than 4 cm/year. Earlier theories of continental drift were that continents ploughed through the sea, the idea that the seafloor itself moves as it expands from a central axis was proposed by Harry Hess from Princeton University in the 1960s. The theory is accepted now, and the phenomenon is known to be caused by convection currents in the asthenosphere, which is ductile, or plastic. In the general case, sea floor spreading starts as a rift in a land mass. The process starts with heating at the base of the continental crust which causes it to become more plastic, because less dense objects rise in relation to denser objects, the area being heated becomes a broad dome. As the crust bows upward, fractures occur that gradually grow into rifts, the typical rift system consists of three rift arms at approximately 120 degree angles. These areas are named triple junctions and can be found in places across the world today. The separated margins of the continents evolve to form passive margins, Hess theory was that new seafloor is formed when magma is forced upward toward the surface at a mid-ocean ridge. If spreading continues past the incipient stage described above, two of the arms will open while the third arm stops opening and becomes a failed rift. As the two active rifts continue to open, eventually the continental crust is attenuated as far as it will stretch, at this point basaltic oceanic crust begins to form between the separating continental fragments. When one of the rifts opens into the ocean, the rift system is flooded with seawater. The Red Sea is an example of a new arm of the sea, during this period of initial flooding the new sea is sensitive to changes in climate and eustasy. As a result, the new sea will evaporate several times before the elevation of the valley has been lowered to the point that the sea becomes stable. During this period of evaporation large evaporite deposits will be made in the rift valley, later these deposits have the potential to become hydrocarbon seals and are of particular interest to petroleum geologists
24.
Picrite basalt
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Picrite basalt, picrobasalt is a variety of high-magnesium olivine basalt that is very rich in the mineral olivine. It is dark with yellow-green olivine phenocrysts and black to dark brown pyroxene, the compositions of these rocks are well represented by mixes of olivine and more typical tholeiitic basalt. Picrites and komatiites are somewhat similar chemically, but differ in that komatiite lavas are products of more magnesium-rich melts, in contrast, picrites are magnesium-rich because crystals of olivine have accumulated in more normal melts by magmatic processes. Komatiites are largely restricted to the Archean, when the term oceanite was apparently first proposed by Antoine Lacroix, he used the term to apply only to basalts with more than 50% olivine content. Picrite basalt is found in the lavas of Mauna Kea and Mauna Loa in Hawaiʻi, Curaçao, in the Piton de la Fournaise volcano on Réunion Island, Picrite basalt has been erupted in historical times from Mauna Loa during the eruptions of 1852 and 1868. Picrite basalt with 30% olivine commonly erupts from the Piton de la Fournaise, the term was coined by Antoine Lacroix in 1923. Olivine basalt is commonly used by foundries, boilermakers and boiler users to protect the area around a burner tip or to protect a floor from molten metal and its use in this fashion is appropriate since olivine is a highly refractory, high-melting-temperature mineral. ^ Carmichael, Ian S. E. Turner, Francis J. and Verhoogen, John, Igneous Petrology, McGraw-Hill, what is the difference between a komatiite and a picrite. ^ Le Maitre, L. E. ed. Igneous Rocks, A Classification and Glossary of Terms 2nd edition, the 1852 and 1868 Mauna Loa Picrite Eruptions Geophysical Monograph Series, vol. 92, AGU, Abstract retrieved 18 February 2006, ^ Wilkenson, J. F. G. and Hensel, H. D.1988, The petrology of some picrites from Mauna Loa and Kilauea volcanoes, Hawaii, Contrib. Mineralogy and Petrology, v.98, pp. 326–345, ^ Williams, Howel, Francis J. Turner, and Charles M. Gilbert,1954, Petrography W. H. Freeman, pp.40 –41
25.
Basalt
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Basalt is a common extrusive igneous rock formed from the rapid cooling of basaltic lava exposed at or very near the surface of a planet or moon. Flood basalt describes the formation in a series of basalt flows. By definition, basalt is an igneous rock with generally 45-55% silica and less than 10% feldspathoid by volume. Basalt commonly features a very fine-grained or glassy matrix interspersed with visible mineral grains, the average density is 3.0 gm/cm3. Basalt is defined by its content and texture, and physical descriptions without mineralogical context may be unreliable in some circumstances. Basalt is usually grey to black in colour, but rapidly weathers to brown or rust-red due to oxidation of its mafic minerals into hematite, although usually characterized as dark, basaltic rocks exhibit a wide range of shading due to regional geochemical processes. Due to weathering or high concentrations of plagioclase, some basalts can be quite light-coloured and these phenocrysts usually are of olivine or a calcium-rich plagioclase, which have the highest melting temperatures of the typical minerals that can crystallize from the melt. Basalt with a texture is called vesicular basalt, when the bulk of the rock is mostly solid. Gabbro is often marketed commercially as black granite and these ultramafic volcanic rocks, with silica contents below 45% are usually classified as komatiites. Agricola applied basalt to the black rock of the Schloßberg at Stolpen. Tholeiitic basalt is relatively rich in silica and poor in sodium, included in this category are most basalts of the ocean floor, most large oceanic islands, and continental flood basalts such as the Columbia River Plateau. Basalt rocks are in some cases classified after their content in High-Ti and Low-Ti varieties. High-Ti and Low-Ti basalts have been distinguished in the Paraná and Etendeka traps and it has greater than 17% alumina and is intermediate in composition between tholeiite and alkali basalt, the relatively alumina-rich composition is based on rocks without phenocrysts of plagioclase. Alkali basalt is relatively poor in silica and rich in sodium and it is silica-undersaturated and may contain feldspathoids, alkali feldspar and phlogopite. Boninite is a form of basalt that is erupted generally in back-arc basins. Ocean island basalt Lunar basalt On Earth, most basalt magmas have formed by melting of the mantle. Basalt commonly erupts on Io, the third largest moon of Jupiter, and has formed on the Moon, Mars, Venus. The crustal portions of oceanic tectonic plates are composed predominantly of basalt, produced from upwelling mantle below, the mineralogy of basalt is characterized by a preponderance of calcic plagioclase feldspar and pyroxene
26.
Dorset culture
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The Dorset culture was a Paleo-Eskimo culture that preceded the Inuit in the Arctic of North America. It is named after Cape Dorset in Nunavut, Canada where the first evidence of its existence was found, the culture has been defined as having four phases due to the distinct differences in the technologies relating to hunting and tool making. Artifacts include distinctive triangular end-blades, soapstone lamps, and burins, the Dorset were first identified as a separate culture in 1925. Archaeology has been critical to adding to knowledge about them because the Dorset were essentially extinct by 1500 due to difficulties in adapting to the Medieval Warm Period, the Thule people, who began migrating east from Alaska in the 11th century, began the displacement of the Dorset. Modern genetic studies show the Dorset population were distinct from later groups, Inuit legends recount them driving away people they called the Tuniit or Sivullirmiut First Inhabitants. According to legend, the First Inhabitants were giants, taller and stronger than the Inuit, scholars now believe the Dorset and the later Thule people were the peoples encountered by Norsemen who visited the area. The Norse called these indigenous peoples skræling, in 1925 anthropologist Diamond Jenness received some odd artifacts from Cape Dorset. As they were different from those of the Inuit, he speculated that they were indicative of an ancient. Jenness named the culture Dorset after the location of the find and these artifacts showed a consistent and distinct cultural pattern that included sophisticated art distinct from that of the Inuit. For example, the carvings featured uniquely large hairstyles for women, much research since then has revealed many details of the Dorset people and their culture. The origins of the Dorset people are not well understood and they may have developed from the previous cultures of Pre-Dorset, Saqqaq or Independence I. There are, however, problems with this theory, these cultures had bow and arrow technology which the Dorsets lacked. Possibly due to a shift from terrestrial to aquatic hunting, the bow and arrow became lost to the Dorset, another piece of technology that is missing from the Dorset are drills, there are no drill holes in Dorset artifacts. Instead, the Dorset gouged lenticular holes, for example, bone needles are common in Dorset sites, but they have long and narrow holes that have been painstakingly carved or gouged. Both the Pre-Dorset and Thule had drills, Dorset culture and history is divided into four periods, the Early, Middle, Late, and Terminal phases. The Terminal phase was already in progress when the Thule entered the Canadian Arctic and it is probably closely related to the onset of the Medieval Warm Period, which started to warm the Arctic considerably around AD800. With the warmer climates, the sea ice became less predictable and was isolated from the High Arctic, the Dorset were highly adapted to living in a very cold climate, and much of their food came from hunting sea mammals through holes in the ice. The massive decline in sea-ice which the Medieval Warm Period produced would have had an impact upon their way of life
27.
Beothuk
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The Beothuk were an indigenous people based on the island of Newfoundland. Beginning around AD1500, the Beothuk culture formed and this appeared to be the most recent cultural manifestation of peoples who first migrated from Labrador to present-day Newfoundland around AD1. The ancestors of this group had three earlier cultural phases, each lasting approximately 500 years, in 2007 DNA testing was conducted on material from the teeth of Demasduit and her husband Nonosabasut, two Beothuk individuals who had died in the 1820s. The results assigned them to Haplogroup X and Haplogroup C, respectively and it also demonstrated they were solely of First Nation indigenous maternal ancestry, unlike some earlier studies that suggested European admixture. The Beothuk lived throughout the island of Newfoundland, particularly in the Notre Dame, estimates vary as to the number of Beothuk at the time of contact with Europeans. Scholars of the 19th and early 20th century estimated about 2,000 individuals at the time of European contact in the 15th century, Recent scholarship suggests there may have been no more than 500 to 700 people. They lived in independent, self-sufficient, extended family groups of 30 to 55 people, like many other hunter-gathering peoples, they appear to have had band leaders but probably not more formal chiefs. They lived in dwellings known as mamateeks, which were fortified for the winter season. These were constructed by arranging poles in a circle, tying them at the top, the floors were dug with hollows used for sleeping. A fireplace was made at the center, during spring, the Beothuk used red ochre to paint not only their bodies, but also their houses, canoes, weapons, household appliances and musical instruments. This practice led Europeans to refer to them as Red Indians, the use of ochre had great cultural significance. The decorating was done during an annual spring celebration. It designated tribal identity, for example, decorating newborn children was a way to welcome them into the tribe, forbidding a person to wear ochre was a form of punishment. Their main sources of food were caribou, salmon, and seals, augmented by harvesting other animal, the Beothuk followed the seasonal migratory habits of their principal quarry. In the fall, they set up fences, sometimes 30–40 miles long. The Beothuk are also known to have made an out of tree sap. They preserved surplus food for use during winter, trapped various fur-bearing animals, the fur side was worn next to the skin, to trap air against a persons body. Beothuk canoes were made of caribou or seal skin, and the bow of the canoe was stiffened with spruce bark
28.
Inuit
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Inuit are a group of culturally similar indigenous peoples inhabiting the Arctic regions of Greenland, Canada and Alaska. Inuit is a noun, the singular is Inuk. The Inuit languages are part of the Eskimo-Aleut family, Inuit Sign Language is a critically endangered language isolate spoken in Nunavut. In the United States and Canada, the term Eskimo was commonly used to describe the Inuit and Alaskas Yupik, however, Inuit is not accepted as a term for the Yupik, and Eskimo is the only term that includes Yupik, Iñupiat and Inuit. However, aboriginal peoples in Canada and Greenlandic Inuit view Eskimo as pejorative, in Canada, sections 25 and 35 of the Constitution Act of 1982 classified the Inuit as a distinctive group of Aboriginal Canadians who are not included under either the First Nations or the Métis. These areas are known in Inuktitut as the Inuit Nunangat, in the United States, the Iñupiat live primarily on the Alaska North Slope and on Little Diomede Island. The Greenlandic Inuit are descendants of migrations from Canada. In the 21st century they are citizens of Denmark, although not of the European Union, Inuit are the descendants of what anthropologists call the Thule culture, who emerged from western Alaska around 1000 CE. They had split from the related Aleut group about 4,000 years ago and from northeastern Siberian migrants, possibly related to the Chukchi language group and they spread eastwards across the Arctic. They displaced the related Dorset culture, the last major Paleo-Eskimo culture, Inuit legends speak of the Tuniit as giants, people who were taller and stronger than the Inuit. Less frequently, the legends refer to the Dorset as dwarfs, researchers believe that the Dorset culture lacked the dogs, larger weapons and other technologies of the Inuit society, which gave the latter an advantage. By 1300, Inuit migrants had reached west Greenland, where they settled, faced with population pressures from the Thule and other surrounding groups, such as the Algonquian and Siouan to the south, the Tuniit gradually receded. They were thought to have become extinct as a people by about 1400 or 1500. But, in the mid-1950s, researcher Henry B. Collins determined that, based on the ruins found at Native Point, the Sadlermiut population survived up until winter 1902–03, when exposure to new infectious diseases brought by contact with Europeans led to their extinction as a people. In the early 21st century, mitochondrial DNA research has supported the theory of continuity between the Tuniit and the Sadlermiut peoples and it also provided evidence that a population displacement did not occur within the Aleutian Islands between the Dorset and Thule transition. In contrast to other Tuniit populations, the Aleut and Sadlermiut benefited from both geographical isolation and their ability to adopt certain Thule technologies, in Canada and Greenland, Inuit circulated almost exclusively north of the Arctic tree line, the effective southern border of Inuit society. The most southern officially recognized Inuit community in the world is Rigolet in Nunatsiavut, south of Nunatsiavut, the descendants of the southern Labrador Inuit in NunatuKavut continued their traditional transhumant semi-nomadic way of life until the mid-1900s. The Nunatukavummuit people usually moved among islands and bays on a seasonal basis and they did not establish stationary communities
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Thule people
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The Thule or proto-Inuit were the ancestors of all modern Inuit. They developed in coastal Alaska by 1000 and expanded eastwards across Canada, in the process, they replaced people of the earlier Dorset culture that had previously inhabited the region. The appellation Thule originates from the location of Thule in northwest Greenland, facing Canada, the links between the Thule and the Inuit are biological, cultural, and linguistic. Evidence supports the idea that the Thule were in contact with the Vikings, in Viking sources, these peoples are called the Skræling. Some Thule migrated southward, in the Second Expansion or Second Phase, by the 13th or 14th century, the Thule had occupied an area currently inhabited by the Central Inuit, and by the 15th century, the Thule replaced the Dorset. Intensified contacts with Europeans began in the 18th century, compounded by the already disruptive effects of the Little Ice Age, the Thule communities broke apart, and the people were henceforward known as the Eskimo, and later, Inuit. The Thule Tradition lasted from about 200 B. C. to 1600 A. D. around the Bering Strait, Thule culture was mapped out by Therkel Mathiassen, following his participation as an archaeologist and cartographer of the Fifth Danish Expedition to Arctic America in 1921–1924. There are three stages of development leading up to Thule culture, they are Okvik/Old Bering Sea, Punuk, Birnirk and these groups of peoples have been referred to as “Neo-Eskimo” cultures, which are differentiated from the earlier Norton Tradition. There are several stages of the Thule tradition, Old Bering Sea Stage, Punuk Stage and these stages represent variations of the Thule Tradition as it expanded over time. And spread across the coasts of Labrador and Greenland and it is the most recent “neo-Eskimo” culture. Jenness identified the Bering Sea culture as a highly developed Inuit culture of northeastern Asiatic origin, a strong maritime adaptation is characteristic of the Thule, and the OBS stage, and then can be seen in the archaeological evidence. Both Kayaks and umiaks appear in the record for the first time. The toolkits of the people of the time are dominated by polished-slate rather than flaked-stone artifacts, including knives, projectile heads. There are many important innovations that emerged that allowed hunting to be more efficient, harpoon mounted ice picks were used for seal hunting, as well as ivory plugs and mouthpieces for inflating harpoon line floats, which enabled them to recover larger sea mammals when dispatched. These people relied heavily on seal and walrus for subsistence and it is easy to pick out OBS technology because of the artistic curvilinear dots, circles, and shorter lines that were used to decorate their tools. The chronological relationship between the Okvik and Old Bering Seas cultures has been the subject of debate and remains largely undecided, based mainly on art styles. The Punuk stage is a development of Old Bering Sea stage, with distribution along the major Strait islands, the Punuk culture was initially defined by Henry Collins in 1928 from a 16 ft deep midden on one of the Punuk Islands. Punuk is differentiated with Old Bering Sea through its artifact styles and house forms, as well as harpoon styles, Punuk settlements were larger and more common than earlier villages
30.
International Hydrographic Organization
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The International Hydrographic Organization is the inter-governmental organisation representing hydrography. A principal aim of the IHO is to ensure that the seas, oceans. It does this through the setting of standards, the co-ordination of the endeavours of the worlds national hydrographic offices. The IHO enjoys observer status at the United Nations where it is the competent authority on hydrographic surveying. When referring to hydrography and nautical charting in Conventions and similar Instruments, it is the IHO standards, the IHO was established in 1921 as the International Hydrographic Bureau. The present name was adopted in 1970 as part of a new international Convention on the IHO adopted by the member nations. The former name International Hydrographic Bureau was retained to describe the IHO secretariat until 8 November 2016, there were substantial differences in hydrographic procedures charts, and publications. In 1889, an International Maritime Conference was held at Washington, D. C. similar proposals were made at the sessions of the International Congress of Navigation held at Saint Petersburg in 1908 and the International Maritime Conference held at Saint Petersburg in 1912. In 1919 the hydrographers of Great Britain and France cooperated in taking the steps to convene an international conference of hydrographers. London was selected as the most suitable place for this conference, and on 24 July 1919 and this is still the major purpose of the IHO. As a result of the conference, a permanent organization was formed, the IHB, now the IHO, began its activities in 1921 with 18 nations as members. The Principality of Monaco was selected as the seat of the organization as a result of the offer of Albert I, the IHO develops hydrographic and nautical charting standards. These standards are adopted and used by its 86 member countries and others in their surveys, nautical charts. Much has been done in the field of standardisation since the Bureau was founded, the IHO has encouraged the formation of Regional Hydrographic Commissions. Each RHC coordinates the national surveying and charting activities of countries within each region, the 15 RHCs plus the IHO Hydrographic Commission on Antarctica effectively cover the world. The IHO, in partnership with the Intergovernmental Oceanographic Commission, directs the General Bathymetric Chart of the Oceans programme, in 2010 the IHO introduced a new, contemporary hydrographic geospatial standard for modelling marine data and information, known as S-100. S-100 and any dependent product specifications are underpinned by an on-line registry accessible via the IHO website, S-100 is aligned with the ISO19100 series of geographic standards, thereby making it fully compatible with contemporary geospatial data standards. Because S-100 is based on ISO19100, it can be used by other providers for their maritime-related data
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Labrador
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Labrador /ˈlæbrədɔːr/ LAB-rə-dor is the distinct northerly region of the Canadian province of Newfoundland and Labrador. It comprises the portion of the province, separated from the island of Newfoundland by the Strait of Belle Isle. It is the largest and northernmost geographical region in Atlantic Canada, Labrador occupies the eastern part of the Labrador Peninsula. It is bordered to the west and the south by the Canadian province of Quebec, Labrador also shares a small land border with the Canadian territory of Nunavut on Killiniq Island. Though Labrador covers 71 percent of the land area, it has only 8 percent of the provinces population. The aboriginal peoples of Labrador include the Northern Inuit of Nunatsiavut, the Southern Inuit-Métis of Nunatukavut, many of the non-aboriginal population in Labrador did not permanently settle in Labrador until the natural resource developments of the 1940s and 1950s. Before the 1950s, very few people lived in Labrador year-round. The few European immigrants who worked seasonally for foreign merchants and brought their families were known as Settlers, Labrador has a roughly triangular shape that encompasses the easternmost section of the Canadian Shield, a sweeping geographical region of thin soil and abundant mineral resources. Its western border with Quebec is the divide of the Labrador Peninsula. Lands that drain into the Atlantic Ocean are part of Labrador, Northern Labradors climate is classified as polar, while Southern Labradors climate is classified as subarctic. Labrador can be divided into four regions, the North Coast, Central Labrador, Western Labrador. Each of those regions is described below, from Cape Chidley to Hamilton Inlet, the long thin northern tip of Labrador holds the Torngat Mountains, named after an Inuit spirit believed to inhabit them. The mountains stretch along the coast from Port Manvers to Cape Chidley, the Torngat Mountain range is also home to Mount Caubvick, the highest point in the province. This area is predominantly Inuit, with the small Innu community of Natuashish being the exception, the north coast is the most isolated region of Labrador, with snowmobiles, boats, and planes being the only modern modes of transportation. The largest community in this region is Nain, Nunatsiavut is an Inuit self-government region in Labrador created on June 23,2000. The Settlement area comprises the majority of Labradors North Coast, while the area also includes land farther to the interior. Nain is the center of Nunatsiavut. The most populous region of Labrador, Central Labrador extends from the shores of Lake Melville into the interior and it contains the Churchill River, the largest river in Labrador and one of the largest in Canada
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Newfoundland and Labrador
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Newfoundland and Labrador is the most easterly province of Canada. Situated in the countrys Atlantic region, it comprises the island of Newfoundland and mainland Labrador to the northwest, in 2013, the provinces population was estimated at 526,702. About 92% of the population lives on the island of Newfoundland. The province is Canadas most linguistically homogeneous, with 97. 6% of residents reporting English as their mother tongue in the 2006 census, historically, Newfoundland was also home to unique varieties of French and Irish, as well as the extinct Beothuk language. In Labrador, local dialects of Innu-aimun and Inuktitut are also spoken, Newfoundland and Labradors capital and largest city, St. Johns, is Canadas 20th-largest census metropolitan area and is home to almost 40 percent of the provinces population. St. Johns is the seat of government, home to the House of Assembly of Newfoundland and Labrador and to the highest court in the jurisdiction and it became the tenth province to enter the Canadian Confederation on March 31,1949, as Newfoundland. On December 6,2001, an amendment was made to the Constitution of Canada to change the official name to Newfoundland. The name Newfoundland is a translation of the Portuguese Terra Nova, the influence of early Portuguese exploration is also reflected in the name of Labrador, which derives from the surname of the Portuguese navigator João Fernandes Lavrador. Newfoundland and Labrador is the most easterly province in Canada, and is located at the corner of North America. The Strait of Belle Isle separates the province into two divisions, Labrador, which is a large area of mainland Canada, and Newfoundland. The province also includes over 7,000 tiny islands, each side is about 400 km long, and its area is 108,860 km2. Newfoundland and its small islands have a total area of 111,390 km2. Newfoundland extends between latitudes 46°36′N and 51°38′N, Labrador is an irregular shape, the western part of its border with Quebec is the drainage divide of the Labrador Peninsula. Lands drained by rivers that flow into the Atlantic Ocean are part of Labrador, most of Labradors southern boundary with Quebec follows the 52nd parallel of latitude. Labradors extreme northern tip, at 60°22′N, shares a border with Nunavut. Together, Newfoundland and Labrador make up 4. 06% of Canadas area, Labrador is the easternmost part of the Canadian Shield, a vast area of ancient metamorphic rock comprising much of northeastern North America. Colliding tectonic plates have shaped much of the geology of Newfoundland, gros Morne National Park has a reputation as an outstanding example of tectonics at work, and as such has been designated a World Heritage Site. The Long Range Mountains on Newfoundlands west coast are the northeasternmost extension of the Appalachian Mountains, the north-south extent of the province, prevalent westerly winds, cold ocean currents and local factors such as mountains and coastline combine to create the various climates of the province
33.
Cape Farewell, Greenland
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Cape Farewell is a headland on the southern shore of Egger Island, Nunap Isua Archipelago, Greenland. As the southernmost point of the country, it is one of the important landmarks of Greenland, Egger and the associated minor islands are known as the Cape Farewell Archipelago. The area is part of the Kujalleq municipality, king Frederick VI Coast stretches from Cape Farewell to Pikiulleq Bay in the north along the eastern coast of Greenland. List of countries by southernmost point Aerial photographs of the Kap Farvel area Ketilidian structure and the rapakivi suite between Lindenow Fjord and Kap Farvel, South-East Greenland
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Gulf of Saint Lawrence
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The Gulf of Saint Lawrence is the outlet of the North American Great Lakes via the Saint Lawrence River into the Atlantic Ocean. The gulf is a sea, covering an area of about 236,000 square kilometres and containing about 35,000 cubic kilometres of water. As for significant islands the Gulf of Saint Lawrence contains Anticosti Island, PEI, Îles-de-la-Madeleine, Cape Breton Island, Saint Pierre Island, and Miquelon-Langlade. Half of the ten provinces of Canada adjoin the Gulf, New Brunswick, Nova Scotia, Prince Edward Island, Newfoundland and Labrador, and Quebec. Branches of the Gulf include the Chaleur Bay, Fortune Bay, Miramichi Bay, St. Georges Bay, Bay St. George, Bay of Islands, the Cabot Strait between Newfoundland and Saint-Pierre and Cape Breton Island,104 km wide and 480 m deep at its deepest. The Strait of Canso between Cape Breton Island and the Nova Scotia peninsula,1.0 km wide and 60 m deep at its deepest. Due to the construction of the Canso Causeway across the strait in 1955, the limits of the Gulf of Saint Lawrence vary between sources. The International Hydrographic Organization defines the limits of the Gulf of Saint Lawrence as follows, Fisheries, St. Paul Island, Nova Scotia, off the northeastern tip of Cape Breton Island, is referred to as the Graveyard of the Gulf because of its many shipwrecks. Access to this island is controlled by the Canadian Coast Guard, the five provinces bordering the Gulf of Saint Lawrence also have several provincial parks apiece, some of which preserve coastal features. The Laurentian Channel is about 290 m deep and about 1,250 km long from the Continental Shelf to the mouth of the Saint Lawrence River. Deep waters with temperatures between 2 and 6.5 °C enter the Gulf at the slope and are slowly advected up the channel by estuariane circulation. Over the 20th century, the waters of the end of the channel have become hypoxic. The gulf has provided an important marine fishery for various First Nations that have lived on its shores for millennia. The first documented voyage by a European in its waters was by the French explorer Jacques Cartier in the year 1534. Cartier named the shores of the Saint Lawrence River The Country of Canadas, after a word meaning village or settlement. At just about the period, Basques came to frequent the area for whale-hunting and trade with the First Nations people of the modern Canadian Atlantic. They left vestiges of their presence in locations of the area—docks, furnaces, graveyards
35.
Cape Bauld
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Cape Bauld is a headland located at the northeasternmost point of Great Northern Peninsula on the island of Newfoundland in the Canadian province of Newfoundland and Labrador. Cape Bauld, slightly south and east of Cape Norman, delineates the end of the Strait of Belle Isle. Cape Bauld is located on the side of Quirpon Island. The English explorer John Cabot may have landed at Cape Bauld on June 24,1497, a lighthouse was constructed at the cape in 1884. The current lighthouse is the replacement structure, constructed 1960–1961. The lightkeepers residence is from 1920, list of lighthouses in Canada Lighthouse information Picture of lighthouse
36.
Belle Isle (Newfoundland and Labrador)
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Belle Isle is an uninhabited island just off the coast of Labrador and north of Newfoundland at the Atlantic entrance to the Strait of Belle Isle which takes its name. The northern terminus of the International Appalachian Trail is located on Belle Isle, Belle Isle rises to about 213 m at its highest point,52 km2 in area,16 km long and 5 km wide. It is nearly 24 km from either coast, though closer to the Labrador side of the Strait of Belle Isle. Officially uninhabited, there is some seasonal occupation during fishing season, Belle Isle is the northernmost peak of the Appalachian Mountains, which extend in various shapes over 3,200 km southwest to Alabama, US. Flow lines in sea ice give a sense of the movement of the ice, ice floes embedded in the Labrador Current appear as a relatively open pattern. Sea ice with a denser pattern enters from the strait, banking against the west side of Belle Isle, tendrils flow around capes at either end of the island, with an ice-free shadow on the opposite, downstream side. Eddies off the western coast in the ice patterns show where the currents interact north, List of communities in Newfoundland and Labrador List of ghost towns in Newfoundland and Labrador Belle Isle, Canada. Strait of Belle Isle ecoregion Chart of The Strait of Belle Isle and Belle Isle by Captain James Cook
37.
East Greenland Current
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The East Greenland Current is a cold, low salinity current that extends from Fram Strait to Cape Farewell. The current is located off the eastern coast of Greenland along the Greenland continental margin, the current cuts through the Nordic Seas and through the Denmark Strait. The EGC is composed of a mixture of three distinct water masses, the water masses are Polar Water, Atlantic Water, and Deep Water. The top 150 meters of the EGC is considered polar water and it is cold and low in salinity. The lowness in salinity has a lot to do with freshwater run off from sea ice melting, river runoff, and Pacific water flux and it is cold due to air-sea interactions while in the Arctic. Typical characteristics for the EGC Polar water are a temperature between 0 °C and –1.7 °C, and the salinity varies greatly from 30 psu to 34 psu at a 150-meter depth, the layer beneath the Polar Water is known as the Atlantic Water layer. It extends down to about 1000 m and this layer is defined as having relatively warm temperatures and saline waters. The temperatures are normally above 0 °C and have a salinity of 34 psu at 150 meters, the Atlantic water that is seen in the EGC comes from two different sources. The first source of Atlantic Water originates from westward directed Atlantic water in the West Spitsbergen Current and this current sends Atlantic water into the Fram Strait, and because it is more dense then the surface Polar water it sinks to an intermediate depth. The second source of AW in the EGC originates from recirculated AW in the Arctic and this is AW that has entered the Arctic via the North Atlantic and has been circulating in the Arctic and is now being pushed out of the Arctic via the EGC. The layer beneath the Atlantic Water is simply referred to as the Deep Water where the salinity and this level typically extends from 1000 meters to the bottom of the ocean. The temperatures in this level are normally below 0 °C. The deep water masses are recirculated within the Greenland Sea due to the Jan Mayen Fracture Zone, here, the deep water encounters the Jan Mayen Ridge and are deflected eastward towards the interior of the Greenland Sea Gyre. The upper layers are able to pass into the north of Iceland unhindered. It is important to note that these recirculated deep water masses in the Greenland Sea Gyre will be recirculated into the EGC once again in the future near Fram Strait, the general movement of the EGC is southward along the eastern Greenland continental margin. The currents are strong with annual averages of 6–12 cm/s in the upper part of the EGC with inter-annual maximums of 20–30 cm/s. It was estimated in 1991 by Hopkins et al. that the transport of water southward ranged from 2–32 sverdrups and that is quite a large variation that they attributed to the widely varying strength of the Atlantic Water flow at intermediate depths. More recent estimations of water transport in the top layers of the EGC is between 3 and 4 sverdrups, one of the most important aspects of the East Greenland Current is the amount of sea ice it exports into the North Atlantic Ocean
38.
Foot (unit)
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The foot is a unit of length in the imperial and US customary systems of measurement. Since 1959, both units have been defined by international agreement as equivalent to 0.3048 meters exactly, in both systems, the foot comprises 12 inches and three feet compose a yard. Historically the foot was a part of local systems of units, including the Greek, Roman, Chinese, French. It varied in length from country to country, from city to city and its length was usually between 250 mm and 335 mm and was generally, but not always, subdivided into 12 inches or 16 digits. The United States is the industrialized nation that uses the international foot and the survey foot in preference to the meter in its commercial, engineering. The foot is legally recognized in the United Kingdom, road signs must use imperial units, the measurement of altitude in international aviation is one of the few areas where the foot is widely used outside the English-speaking world. The length of the international foot corresponds to a foot with shoe size of 13,14,15.5 or 46. Historically the human body has been used to provide the basis for units of length. The foot of a male is typically about 15. 3% of his height, giving a person of 160 cm a foot of 245 mm. These figures are less than the used in most cities over time. Archeologists believe that the Egyptians, Ancient Indians and Mesopotamians preferred the cubit while the Romans, under the Harappan linear measures, Indus cities during the Bronze Age used a foot of 13.2 inches and a cubit of 20.8 inches. The Egyptian equivalent of the measure of four palms or 16 digits—was known as the djeser and has been reconstructed as about 30 cm. The Greek foot had a length of 1⁄600 of a stadion, one stadion being about 181.2 m, the standard Roman foot was normally about 295.7 mm, but in the provinces, the pes Drusianus was used, with a length of about 334 mm. Originally both the Greeks and the Romans subdivided the foot into 16 digits, but in later years, after the fall of the Roman Empire, some Roman traditions were continued but others fell into disuse. In AD790 Charlemagne attempted to reform the units of measure in his domains and his units of length were based on the toise and in particular the toise de lÉcritoire, the distance between the fingertips of the outstretched arms of a man. The toise has 6 pieds each of 326.6 mm, at the same time, monastic buildings used the Carolingian foot of 340 mm. The procedure for verification of the foot as described in the 16th century by Jacob Koebel in his book Geometrei, the measures of Iron Age Britain are uncertain and proposed reconstructions such as the Megalithic Yard are controversial. Later Welsh legend credited Dyfnwal Moelmud with the establishment of their units, the Belgic or North German foot of 335 mm was introduced to England either by the Belgic Celts during their invasions prior to the Romans or by the Anglo-Saxons in the 5th & 6th century
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Mile
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The mile is an English unit of length of linear measure equal to 5,280 feet, or 1,760 yards, and standardised as exactly 1,609.344 metres by international agreement in 1959. The Romans divided their mile into 5,000 feet but the importance of furlongs in pre-modern England meant that the statute mile was made equivalent to 8 furlongs or 5,280 feet in 1593. This form of the mile then spread to the British-colonized nations who continue to employ the mile, the US Geological Survey now employs the metre for official purposes but legacy data from its 1927 geodetic datum has meant that a separate US survey mile continues to see some use. Derived units such as miles per hour and miles per gallon, however, continue to be abbreviated as mph, mpg. The modern English word mile derives from Middle English myl and Old English mīl, the present international mile is usually what is understood by the unqualified term mile. When this distance needs to be distinguished from the nautical mile, in British English, the statute mile may refer to the present international miles or to any other form of English mile since the 1593 Act of Parliament which set it as a distance of 1,760 yards. Under American law, however, the statute mile refers to the US survey mile, the mile has been variously abbreviated—with and without a trailing period—as m, M, ml, and mi. The American National Institute of Standards and Technology now uses and recommends mi in order to avoid confusion with the SI metre and millilitre. Derived units such as miles per hour and miles per gallon, however, continue to be abbreviated in the United States, United Kingdom, the BBC style holds that There is no acceptable abbreviation for ‘miles’ and so it should be spelt out when used in describing areas. The Roman mile consisted of a thousand paces as measured by every other step—as in the distance of the left foot hitting the ground 1,000 times. The ancient Romans, marching their armies through uncharted territory, would push a carved stick in the ground after each 1000 paces. Well-fed and harshly driven Roman legionaries in good weather thus created longer miles, the distance was indirectly standardised by Agrippas establishment of a standard Roman foot in 29 BC, and the definition of a pace as 5 feet. An Imperial Roman mile thus denoted 5,000 Roman feet, surveyors and specialized equipment such as the decempeda and dioptra then spread its use. In modern times, Agrippas Imperial Roman mile was empirically estimated to have been about 1,481 metres in length, in Hellenic areas of the Empire, the Roman mile was used beside the native Greek units as equivalent to 8 stadia of 600 Greek feet. The mílion continued to be used as a Byzantine unit and was used as the name of the zero mile marker for the Byzantine Empire. The Roman mile also spread throughout Europe, with its local variations giving rise to the different units below, also arising from the Roman mile is the milestone. All roads radiated out from the Roman Forum throughout the Empire –50,000 miles of stone-paved roads, at every mile was placed a shaped stone, on which was carved a Roman numeral, indicating the number of miles from the center of Rome – the Forum. Hence, one knew how far one was from Rome
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Nautical mile
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A nautical mile is a unit of measurement defined as exactly 1852 meters. Historically, it was defined as one minute of latitude, which is equivalent to one sixtieth of a degree of latitude. Today it is an SI derived unit, being rounded to a number of meters. The derived unit of speed is the knot, defined as one mile per hour. The geographical mile is the length of one minute of longitude along the Equator, there is no internationally agreed symbol. M is used as the abbreviation for the mile by the International Hydrographic Organization and by the International Bureau of Weights. NM is used by the International Civil Aviation Organization, nm is used by the U. S. National Oceanic and Atmospheric Administration. Nmi is used by the Institute of Electrical and Electronics Engineers, the word mile is from the Latin word for a thousand paces, mīlia. In 1617 the Dutch scientist Snell assessed the circumference of the Earth at 24,630 Roman miles, around that time British mathematician Edmund Gunter improved navigational tools including a new quadrant to determine latitude at sea. He reasoned that the lines of latitude could be used as the basis for a unit of measurement for distance, as one degree is 1/360 of a circle, one minute of arc is 1/21600 of a circle. These sexagesimal units originated in Babylonian astronomy, Gunter used Snells circumference to define a nautical mile as 6,080 feet, the length of one minute of arc at 48 degrees latitude.3 metres. Other countries measure the minute of arc at 45 degrees latitude, in 1929, the international nautical mile was defined by the First International Extraordinary Hydrographic Conference in Monaco as 1,852 meters. Imperial units and United States customary units used a definition of the nautical mile based on the Clarke Spheroid, the United States nautical mile was defined as 6,080.20 feet based in the Mendenhall Order foot of 1893. It was abandoned in favour of the nautical mile in 1954.181 meters. It was abandoned in 1970 and, legally, references to the unit are now converted to 1,853 meters. Conversion of units Orders of magnitude
41.
Levee
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A levee, dike, dyke, embankment, floodbank or stopbank is an elongated naturally occurring ridge or artificially constructed fill or wall, which regulates water levels. It is usually earthen and often parallel to the course of a river in its floodplain or along low-lying coastlines, the word levee, from the French word levée, is used in American English. It originated in New Orleans a few years after the founding in 1718 and was later adopted by English speakers. The name derives from the trait of the ridges being raised higher than both the channel and the surrounding floodplains. The modern word dike or dyke most likely derives from the Dutch word dijk, the 126 kilometres long Westfriese Omringdijk was completed by 1250, and was formed by connecting existing older dikes. The Roman chronicler Tacitus even mentions that the rebellious Batavi pierced dikes to flood their land, the word dijk originally indicated both the trench and the bank. It is closely related to the English verb to dig, in Anglo-Saxon, the word dic already existed and was pronounced as dick in northern England and as ditch in the south. Similar to Dutch, the English origins of the lie in digging a trench. This practice has meant that the name may be given to either the excavation or the bank, thus Offas Dyke is a combined structure and Car Dyke is a trench though it once had raised banks as well. In the midlands and north of England, and in the United States, a dike is what a ditch is in the south, a property boundary marker or small drainage channel. Where it carries a stream, it may be called a dike as in Rippingale Running Dike. The Weir Dike is a dike in Bourne North Fen, near Twenty and alongside the River Glen. In the Norfolk and Suffolk Broads, a dyke may be a ditch or a narrow artificial channel off a river or broad for access or mooring, some longer dykes being named. In parts of Britain, particularly Scotland, a dyke may be a field wall, Levees can be mainly found along the sea, where dunes are not strong enough, along rivers for protection against high-floods, along lakes or along polders. Furthermore, levees have been built for the purpose of empoldering, the latter can be a controlled inundation by the military or a measure to prevent inundation of a larger area surrounded by levees. Levees have also built as field boundaries and as military defences. More on this type of levee can be found in the article on dry-stone walls, Levees can be permanent earthworks or emergency constructions built hastily in a flood emergency. When such a bank is added on top of an existing levee it is known as a cradge
42.
Earth tide
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Earth tide is the displacement of the solid Earths surface caused by the gravity of the Moon and Sun. Its main component has meter-level amplitude at periods of about 12 hours, the largest body tide constituents are semi-diurnal, but there are also significant diurnal, semi-annual, and fortnightly contributions. Though the gravitational forcing causing earth tides and ocean tides is the same, the larger of the periodic gravitational forces is from the Moon but that of the Sun is also important. The images here show lunar tidal force when the Moon appears directly over 30° N and this pattern remains fixed with the red area directed toward the Moon. Red indicates upward pull, blue downward, if, for example the Moon is directly over 90° W, the red areas are centred on the western northern hemisphere, on upper right. If for example the Moon is directly over 90° W, the centre of the red area is 30° N, 90° W and 30° S, 90° E, at 30° latitude a strong peak occurs once per lunar day, giving a significant diurnal force at that latitude. Along the equator two equally sized peaks are equally sized, giving semi-diurnal force there, the Earth tide encompasses the entire body of the Earth and is unhindered by the thin crust and land masses of the surface, on scales that make the rigidity of rock irrelevant. The oscillation periods of the earth as a whole are not near the astronomical periods, the tide components with a period near twelve hours have a lunar amplitude that are a little more than twice the height of the solar amplitudes, as tabulated below. At new and full moon, the Sun and the Moon are aligned, and the lunar, at first- and third-quarter phases of the moon, lunar and solar tides are perpendicular, and the tidal range is at a minimum. The semi-diurnal tides go through one full cycle about once every 12 hours, the classical theory of Earth tides first became established in 1909, primarily to explain nutations, but are also used in Earth rotation predictions. The semi-diurnal tide is primarily lunar and gives rise to sectorial deformations which rise, sectorial variations of vertical and east-west displacements are maximum at the equator and vanish at the poles. There are two cycles along each latitude, the bulges opposite one another, and the depressions similarly opposed, the diurnal tide is lunisolar, and gives rise to tesseral deformations. The vertical and east-west movement is maximum at 45° latitude and is zero on the equator, finally, fortnightly and semi-annual tides have zonal deformations, as the Moon or Sun gravitation is directed alternately away from the northern and southern hemispheres due to tilt. There is zero vertical displacement at 35°16 latitude, since these displacements affect the vertical direction east-west and north-south variations are often tabulated in milliarcseconds for astronomical use. Displacements caused by ocean tidal loading can exceed the displacements due to the earth body tide, sensitive instruments far inland often have to make similar corrections. Atmospheric loading and storm events may also be measurable, though the masses in movement are less weighty, the amplitudes may vary from those listed within several per cent. Volcanologists use the regular, predictable Earth tide movements to calibrate, the tides may also trigger volcanic events. Seismologists have determined that microseismic events are correlated to tidal variations in Central Asia, the semidiurnal amplitude of terrestrial tides can reach about 55 cm at the equator which is important in GPS, VLBI, and SLR measurements
