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) a combination of carbon dioxide (CO2) ice and 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:
Verified
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