Multiple Choice
Thick sheets of ice advanced over North America as far south as New York as recently as ____.
A) year 1816 ("the year without a summer")
B) year 1550
C) 18,000 to 22,000 years ago
D) 1,000 to 2,000 years ago
E) 2 million years ago
Correct Answer:

Verified
Correct Answer:
Verified
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