If the Moon formed out of the same cloud of material from which Earth formed, what can we predict about the composition of moon rocks collected by Apollo astronauts?
A. Moon rocks should have a completely different composition than rocks found on and inside Earth.
B. Moon rocks should have the same composition as rocks found on Earth.
C. Moon rocks should have a composition that is the same as Earth's crust.
D. Moon rocks should have some similar and some different compositional characteristics.
Answer: B
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