How was Earth's Moon formed, according to the currently most-accepted theory?
a) It formed from the collapsing protoplanetary disk at the same time as Earth.
b) It was a passing body captured by Earth's gravity.
c) It formed from debris produced by the collision of a Mars-sized object with the Earth.
d) A gigantic volcano on Earth threw out the material that became the Moon.
e) No one really knows.
Ans: c) It formed from debris produced by the collision of a Mars-sized object with the Earth.
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Fill in the blank(s) with the appropriate word(s).
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