The carbon dioxide atmosphere of Mars was much denser in Mars's early history than it is now.What process is now believed to have begun this atmospheric thinning?
A) The solar wind stripped the outer atmosphere from the planet.
B) The light CO2 molecules escaped directly into space because of the weak gravity of Mars.
C) The CO2 molecules were broken down by solar UV photons,creating the lighter molecules,CO and O2,which then escaped into space.
D) The CO2 was washed out of the atmosphere by rain.
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