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Wrogue Wrogue
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9 years ago
Niagara Falls were formed ________.
A) by humans as a result of the damming of the St. Lawrence River
B) during Precambrian time approximately a billion years ago
C) so long ago that the river's knickpoint is now gone
D) after the retreat of the Pleistocene ice sheets a few thousand years ago
E) after a series of spectacular earthquakes which are still helping the falls evolve
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padrepadre
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9 years ago
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Mastering in Nutritional Biology
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Wrogue Author
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#2
9 years ago
Padre is super smart, thanks.
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9 years ago
No worries, happy to help.
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