The excess deuterium in Venus's atmosphere indicates that Venus currently has substantial amounts of water on its surface.
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Q1: During its formation, Mars cooled quickly because
Q2: The canals on Mars are filled with
Q2: Why can't Venus's atmosphere break up into
Q4: With no water and a thick, slow-moving
Q6: Venus's tectonic processes seem to be vertical
Q7: Which is a characteristic Venus shares with
Q9: The instruments of the Mars Odyssey spacecraft
Q11: What makes up the bulk of the
Q16: The air on Mars is 95% nitrogen
Q19: The crust of Mars is much thinner
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