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In 1915 the german geologist and meteorologist alfred wegener first proposed the theory of continental drift, which states that parts of the earth's crust slowly drift atop a liquid core. the fossil record supports and gives credibility to the theories of continental drift and plate tectonics.

What distinguishes monsoon asia from the remainder of asia? what are the consequent differences between the two?

What border separates sonora and chihuahua national border state border physical boundary natural boundary