Several times in earth's history continents have collided to form supercontinents only to later break apart. Geologist Ross Mitchell discusses a new study in Nature that predicts in 50 to 200 million years time the Americas and Eurasia will collide to form a supercontinent over the Arctic.
Source: http://www.npr.org/2012/02/10/146697652/next-supercontinent-could-form-at-the-north-pole?ft=1&f=1007
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