Mars has sufficient mass and a low enough temperature that water molecules could exist in its atmosphere as vapour.Why does the atmosphere of Mars contain little or no water vapour?
A)Mars formed in a part of the solar nebula that lacked oxygen.
B)Mars formed in a part of the solar nebula that lacked hydrogen.
C)Ultraviolet radiation breaks water molecules into less massive particles that can escape.
D)Water molecules combine readily with chlorine to form hydrochloric acid.

Question

Quizplus · Accepted Answer

Ultraviolet radiation from the sun can break water molecules into hydrogen and oxygen atoms. The lighter hydrogen can then escape Mars' weak gravity, leaving behind little water vapour in the atmosphere.

Mars Has Sufficient Mass and a Low Enough Temperature That