The Arctic ice cap is more vulnerable to melting due to warming than is the Antarctic ice cap because
A. the Arctic ice cap is substantially smaller than the Antarctic ice cap.
B. liquid seawater is beneath the Arctic ice cap, so warmer water can cause melting from below the ice in addition to melting on the surface due to atmospheric warming.
C. ocean currents do not influence the southern hemisphere.
D. All of these answers are factors.
Answer: B
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