How is the Moon's mantle different from Earth's?
A. The lunar mantle is too cold to form convection cells.
B. The lunar mantle extends to the center of the Moon.
C. The Moon's mantle has a higher density than Earth's.
D. The lunar mantle has a different composition than Earth's.
Answer: A
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An observation satellite for mapping purposes is placed in a low Earth orbit. In order to see the whole surface of the Earth, which would be the preferred orbit?
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When the principal quantum number of the
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