Amasia

The prediction relies mostly on the fact that the Pacific plate is already subducting under Eurasia and the Americas; if continued, the process will eventually cause the Pacific to close. Meanwhile, because of the Atlantic mid-ocean ridge, North America would be pushed westward. Thus, the Atlantic at some point in the future would be larger than the Pacific. The combination of those factors would cause the Americas to be combined with Asia, thus forming a supercontinent.

Text adapted from Wikipedia, CC BY-SA 4.0. Photograph: Wikimedia Commons (see Commons), Wikimedia Commons.