The Farallon plate meets the west coast

The immense pressure causes faulting and folding,stacking up rock to form the Appalachian Mountains.Let's fast forward a bit.About 100 million years later,Pangea breaks apart,opening the Southern Atlantic Ocean between the new North American Plate and the African Plate.We forge ahead,and now the eastward-moving Farallon Plate converges with the present-day west coast.The Farallon Plate's greater density makes it sink beneath North America.