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Occurrence Land bridges generally occur on , 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 . 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. 12,000 years ago was when the first humans crossed over to North and South America Tectonic Plates Before Tectonic Plate theory, it was believed that land bridges could explain the occurrence of species in separate continents. Many land bridges were thought up, criss-crossing large areas of ocean. They also apparently disappeared without a trace. Continental drift made this theory negatable.
Other meanings 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 . Containers on Railways In the Railroad industry, land bridge refers to the transport of Containers by rail between Port s on either side of a land mass, such as North America . 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. 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. External links |