It’s been estimated that in all of Earth’s history, there have been 7 supercontinents, with the most recent one being Pangaea.
The next supercontinent (Pangaea Ultima) is expected to form in around 250 million years.
Why is this the case? What phenomenon causes these giant landmasses to coalesce, break apart, then coalesce again?
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The earth isn’t expanding its size so there’s a finite surface over which the plates can move. Eventually they will always collide because the surface area can’t expand. It can’t expand because there is finite mass on earth.
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