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Encyclopedia > Land bridge

A Land bridge is a strip of land exposed during periods of low sea level (see Transgression), connecting what are now separate continents or islands. For considerations of sea level change, in particular rise associated with possible global warming, see sea level rise. ... A transgression is a geologic event during which sea level rises relative to the land and the shoreline moves toward higher ground, resulting in coastal flooding. ... To meet Wikipedias quality standards, this article or section may require cleanup. ...


The best-known is the Bering land bridge, which joined present-day Alaska and eastern Siberia at various times during the Pleistocene ice ages, enabling humans to migrate from Eurasia to the Americas (see Models of migration to the New World). Another land bridge may have connected Great Britain to Europe at around the same time. A historic land bridge surviving to the present day is the Sinai, connecting North Africa with Southwest Asia. The Sinai is the most probable path by which hominids and humans could have migrated out of Africa. A land bridge does not have to be narrow enough to be called an isthmus. Nautical chart of Bering Strait, site of former land bridge between Asia and North America The Bering land bridge, also known as Beringia, was a land bridge roughly 1600 km (1000 miles) north to south at its greatest extent, which joined present-day Alaska and eastern Siberia at various times... Eurasia African-Eurasian aspect of Earth Eurasia is the landmass composed of Europe and Asia. ... World map showing the Americas The Americas are the lands of the Western hemisphere historically considered to consist of the continents of North America and South America with their associated islands and regions. ... The question of when humans first entered the Americas (the New World) and how they arrived has been debated for centuries, and will probably continue to be for many more years to come in the anthropological community. ... World map showing Europe Political map (neighboring countries in Asia and Africa also shown) Europe is one of the seven traditional continents of the Earth. ... Sinai Peninsula, Gulf of Suez (west), Gulf of Aqaba (east) from Space Shuttle STS-40 For other uses of the word Sinai, please see: Sinai (disambiguation). ...  Northern Africa (UN subregion)  geographic, including above North Africa or Northern Africa is the northernmost region of the African continent. ... The definition of cultural-geographical regions in use by the United Nations. ... Genera The hominids are the members of the biological family Hominidae (the great apes), which includes humans, chimpanzees, gorillas, and orangutans. ... Trinomial name Homo sapiens sapiens Linnaeus, 1758 Humans, or human beings, are bipedal primates belonging to the mammalian species Homo sapiens (Latin for wise man or knowing man) under the family Hominidae (known as the great apes). ... The Isthmus of Panama connects North and South America. ...


The most recent time of low sea level occurred about 20,000 years ago (during the Upper Paleolithic) when worldwide sea levels were about 120 meters below today's level. By 10,000 years ago, the sea level had risen to 20 meters below today's level. The Upper Paleolithic (or Upper Palaeolithic) is the third and last subdivision of the Paleolithic or Old Stone Age as it is understood in Europe, Africa and Asia. ...

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Occurrence

Land bridges generally occur on continental shelves: the Bering Strait, where the Bering Land Bridge was during the last glaciation, is part of the edge of the North American plate. For causes of sea level changes, see Sea level change.  Sediment  Rock  Mantle The continental shelf is the extended perimeter of each continent, which is covered during interglacial periods such as the current epoch by relatively shallow seas (known as shelf seas) andbbccvcnccccccccccccccccccccccccvvvvvvvvvvvvvvcggggggggggggggggyutu7ti8yukiyuiyutuiyuiytui gulfs. ... Satellite photo of the Bering Strait Nautical chart of the Bering Strait The Bering Strait fags is a sea strait between Cape Dezhnev, Russia, the easternmost point (169°43 W) of the Asian continent and Cape Prince of Wales, Alaska, the westernmost point (168°05 W) of the American continent... The North American plate is shown in brown on this map The North American Plate is a continental tectonic plate covering most of North America, extending eastward to the Mid-Atlantic Ridge and westward to the Cherskiy Range in East Siberia. ... Schematic of sea level (black) and rate of change (blue) over the last 25 kyr There are multiple complex factors may influence sea level change. ...


A land bridge that rose from the sea floor because of upthrust at the edge of a continental plate is Central America. Where the Cocos Plate, an oceanic tectonic plate off the west coast of Central America is being subducted in a convergent boundary under the North American Plate to the north and the South American Plate to the south, first an island arc, and then continuous dry land have been created. Map of Central America Central America is the central geographic region of the Americas. ...  The Cocos plate, shown in gray-blue, off the Pacific coast of Central America The Cocos Plate (Chocos Plate) is an oceanic tectonic plate beneath the Pacific Ocean off the west coast of Central America, named for Cocos Island, which rides upon it. ... The tectonic plates of the world were mapped in the second half of the 20th century. ... Subduction zones mark sites of convective downwelling of the Earths lithosphere. ... In plate tectonics, a convergent boundary (convergent fault boundary, convergent plate boundary, or active margin) is where two tectonic plates slide towards each other and usually collide forming either a subduction zone with its associated island arc or an orogenic belt and associated mountain range. ... The South American Plate is a continental tectonic plate covering the continent of South America and extending eastward to the Mid-Atlantic Ridge. ... An island arc is a type of archipelago formed by plate tectonics as one oceanic tectonic plate subducts under another and produces magma. ...

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Plate Tectonics

Before Plate tectonics theory, it was believed that land bridges could explain the occurrence of species in separate continents. Many land bridges were thought up, cross-crossing large areas of ocean. They also apparently disappeared without a trace. Continental drift made this theory negatable. This article or section does not cite its references or sources. ...

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Other meanings

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Air rights

The term land bridge sometimes refers to covering transportation facilities with bridges for non-transportation uses, such as parks, housing, or offices. For this use, see air rights. Air rights are a type of development right in real estate. ...

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Containers on Railways

In the railroad industry, land bridge refers to the transport of containers by rail between ports on either side of a land mass, such as North America. This is the top-level page of WikiProject trains Rail tracks Rail transport refers to the land transport of passengers and goods along railways or railroads. ... Shipping containers at a terminal in Port Elizabeth, New Jersey. ... Seaport, a painting by Claude Lorrain, 1638 The Port of Wellington at night. ... World map showing North America A satellite composite image of North America. ...

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Saudi Arabia

In 2005 Saudi Arabia initiated a 3,000 km project of railway construction to link cities, ports and mines within the country, and potentially with adjacent countries.

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Wildlife

The term land bridge is sometimes used for wide bridges built over highways for wildlife and park users to cross. A natural crossing of a waterway is known as a natural arch or natural bridge. Rainbow Bridge was formed by a meandering watercourse A natural arch or natural bridge is a formation (or landform) where a rock arch forms, with a natural passageway through underneath. ...


 
 

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