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2 votes
Why

is Mars' surface so cold?
a) Mars has no greenhouse gas in its atmosphere
b) Mars has a thich atmosphere
c) None of the above

User Frazz
by
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2 Answers

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I would say C) None of the above
Because Mars has Carbon Dioxide which is a green house gas and Mars has a very thin atmosphere!
User Patrick Read
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The answer to this question is none of the above. This is best represented by option C.

Mars has such a cold surface due to its thin atmosphere which has carbon dioxide (CO2), a greenhouse gas. Compared to Earth, Mars has a cold surface because the atmosphere isn’t thick enough to absorb excessive amounts of heat and create a greenhouse effect such as a warm environment. Hence, options A and B are both incorrect which leaves C.
User Verism
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