There are seven major plates that currently exist:
Although, evidence has been found that the Indo-Australian plate has cracked therefore making the total existing plates to 8.
The earliest evidence of the tectonic plates was found in Greenland which was estimated to be abbout 3.8 billion years old. Covnersely, researchers have found that the tectonic plates have been active for as long as 4 billion years ago.
There have been two supercontinents: The Rodinia which happened a billion years ago while the most recent one The Pangea formed about 300 million years ago.
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