Pangea Ultima: Earth in 250 Million Years . ... The surface of the Earth is broken up into several large plates that are slowly shifting. About 250 million years ago, the plates on which the present-day continents rest were positioned quite differently , so that all the landmasses were clustered together in one supercontinent now dubbed Pangea . About 250 million years from now, the plates are again projected to reposition themselves so that a single landmass dominates. ...