Why do Mercury and the Moon lack an atmosphere?
A. They are so cold that all their gases have frozen into deposits below their surface.
B. They formed after all the gas had been used up.
C. They are so small that their gravity is too weak to retain an atmosphere.
D. They formed before the solar nebula had captured any gas.
Answer: C
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Indicate whether the statement is true or false.
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nuclei. Indicate whether the statement is true or false.
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