Which North American geographic Feature was NOT formed by retreating glaciers during the last Ice Age? a. Niagara Falls b. the Grand Canyon c. the Great Lakes d. the Upper Mississippi River please help!

Which North American geographic Feature was NOT formed by retreating glaciers during the last Ice Age?

a. Niagara Falls

b. the Grand Canyon

c. the Great Lakes

d. the Upper Mississippi River

please help!!

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Which North American geographic Feature was NOT formed by retreating glaciers during the last Ice Age? a. Niagara Falls b. the Grand Canyon c. the Great Lakes d. the Upper Missi…

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