Which of the following statements is correct?
A)Continental and valley glaciers both move mostly by basal slip.
B)Continental and valley glaciers both move mostly by plastic flow.
C)Continental glaciers move mostly by basal slip; valley glaciers move mostly by plastic flow.
D)Continental glaciers move mostly by plastic flow; valley glaciers move mostly by basal slip.

Question

Quizplus · Accepted Answer

Continental glaciers are much thicker than valley glaciers and therefore experience greater pressure at their bases. This pressure causes the ice at the base of a continental glacier to melt, which lubricates the glacier's bed and allows it to move more easily by basal slip. Valley glaciers, on the other hand, are not as thick and do not experience as much pressure at their bases. As a result, they move more slowly and by plastic flow.

Which of the Following Statements Is Correct