All the Following Statements About Mars Are True

question 175

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

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