Spyke

50Kyrs: Niagara Falls will have eroded the remaining 32 km to Lake Erie and will therefore cease to exist.[36]

Dang, that was fast! oO

5

Niagara falls: 51 meters high. Lake Erie: 64 meters deep.

Sooo, lake Erie will also (mostly?) cease to exist.

I didn't bother finding the elevation difference..

1

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