The Moon has an average density of 3.3 g/cm3. From this number, what can we infer about the composition of the Moon?
A. Its composition is mostly metals and water ice.
B. Its composition is entirely silicates.
C. Its composition is exactly the same as Earth's.
D. Its composition is mostly silicates, with some iron.
E. None of these choices are correct.
Answer: D
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