Earth’s continental drift
Fig. 4.8 . Two hundred million years ago all of the continents were grouped into a single super-continent called Pangaea and the world contained only one ocean (top). The continents then drifted away from Pangaea, riding on the back of plates to the positions they now occupy (middle). The bottom diagram depicts the world geography 50 million years from now.
Copyright 2010, Professor Kenneth R. Lang, Tufts University