Observations by the Mars Odyssey orbiter show that most of the water on Mars today is
A) frozen beneath the surface
B) flowing in rivers on the surface
C) present in the atmosphere
D) present in the residual polar caps

Question

Quizplus · Accepted Answer

Observations by the Mars Odyssey orbiter indicate that most of the water on Mars today is frozen beneath the surface as ice. The orbiter has detected large amounts of hydrogen, which is a key element in water, in the uppermost meter of the surface layer, suggesting a significant reservoir of frozen water.

Observations by the Mars Odyssey Orbiter Show That Most of the Water