The residual polar caps on Mars are made of
A) carbon dioxide ice
B) methane ice
C) water ice
D) a uniform mixture of water and carbon dioxide ices

Question

Quizplus · Accepted Answer

The residual polar caps on Mars are made of water ice. This has been confirmed through data collected by various Mars missions, including the Mars Reconnaissance Orbiter. While carbon dioxide ice and a mixture of water and carbon dioxide ices are also present on Mars, they do not make up the residual polar caps. Methane ice has not been found in significant quantities on Mars.

The Residual Polar Caps on Mars Are Made of