What is the definition of a geographical barrier?

Answer

A geographical barrier can be defined as a naturally occurring formation or body of water that segregates and isolates an area. Common geographic barriers are mountains, glaciers, islands, lakes, oceans, rivers and canyons.

A geographical barrier can cause allopatric speciation. This occurs when a geographical barrier isolates a species and causes it to evolve into a new species. The population of a species becomes separated by the geographical barrier, forming two groups. The group that is isolated by the barrier can not mate with the other group, which causes the gene pool of the isolated species to become significantly smaller, leading to the formation of a brand new species.

Q&A Related to "What is the definition of a geographical barrier..."
Some barriers were the surround city there were three ways and side that India had because of being surrounded by water on 3 sides there barriers would stop invasion. THis was Luis
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The Gobi Desert, the Himilaya's and the ocean are geographic barriers
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The Alps and the Mediterranean sea.
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A major psychological barrier is fear. For example, people are afraid to start a new job or go on a date with someone new because they fear eventually losing either the occupation
http://www.ehow.com/info_8129277_psychological-bar...
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Prezygotic barriers or isolating mechanisms in reproduction among different species are: geographic, temporal, behavioral, ecological, mechanical and gametic incompatibility ...
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