Multiple Choice
Niagara Falls were formed________ .
A) after a series of spectacular earthquakes which are still helping the falls evolve
B) after the retreat of the Pleistocene ice sheets a few thousand years ago
C) so long ago that the river's knickpoint is now gone
D) by humans as a result of the damming of the St. Lawrence River
E) during Precambrian time approximately a billion years ago
Correct Answer:
Verified
Correct Answer:
Verified
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