What evidence do we have that all continents were merged into one super-continent called Pangaea 250 million years ago?

Within the next 250 million years, Africa and the Americas will merge with Eurasia to form a supercontinent that approaches Pangean .

Explanation:

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Glacial deposits, specifically till, of the same age and structure are found on many separate continents that would have been together in the continent of Pangaea. Fossil evidence for Pangaea includes the presence of similar and identical species on continents that are now great distances apart.

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