All the Following Statements About Mars Are True

question 120

Multiple Choice

All the following statements about Mars are true.Which one might have led to a significant loss of atmospheric gas to space?

• A)The axis tilt of Mars is thought to change significantly with time.
• B)Mars lost any global magnetic field that it may once have had.
• C)Outgassed water molecules are split apart,and the oxygen then reacts chemically with surface rock on Mars.
• D)Mars probably once had a much higher density of greenhouse gases in its atmosphere than it does today.

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