The polar caps on Mars are now known to consist of:
A) methane (CH₄) , ammonia (NH₃) , and water (H₂O) ices, whose relative abundances vary with the seasons.
B) carbon dioxide (CO₂) ice, which evaporates easily, overlaying thicker and more long-lived water (H₂O) ice.
C) only carbon dioxide (CO₂) ice, which is very volatile and melts easily.
D) only water (H₂O) ice, which does not melt easily and survives the summer heat.
Correct Answer:
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