What is the difference between present and ice-age snowlines along western North America?
A) About 900 to 1000 meters along the southern part of the transect.
B) About 1500 to 2000 meters along the southern part of the transect.
C) About 200 meters along the southern part of the transect.
D) About 3000 meters along the southern part of the transect.
Correct Answer:
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