The most recent North American glaciers reached their maximum thickness and extent ____.
A) in 1,700 A.D.
B) in 2,000 B.C.
C) about 18,000 to 22,000 years ago
D) about two million years ago, at the beginning of the Pleistocene epoch

Question

Quizplus · Accepted Answer

The most recent North American glaciers reached their maximum thickness and extent about 18,000 to 22,000 years ago during the Last Glacial Maximum (LGM).

The Most Recent North American Glaciers Reached Their Maximum Thickness