During winter, the northern polar cap of Mars is made of
A) a layer of carbon dioxide ice
B) a layer of water ice
C) carbon dioxide ice overlaying water ice
D) water ice overlaying carbon dioxide ice

Question

Quizplus · Accepted Answer

The northern polar cap of Mars is composed of carbon dioxide ice overlaying water ice. This structure results from the seasonal deposition of carbon dioxide ice on top of the perennial water ice cap.

During Winter, the Northern Polar Cap of Mars Is Made