On Some Parts of Mars, It Gets Cold Enough for a Gas

question 16

Multiple Choice

On some parts of Mars, it gets cold enough for a gas to freeze out of the atmosphere that does not freeze out by itself at the temperatures and pressures on Earth. This gas makes up some of the polar caps on Mars and is:

• A) water
• B) argon
• C) carbon dioxide
• D) methane
• E) oxygen

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