How well do you know the Moon? Take this twenty-question quiz and see! Don't worry, there are no grades on this quiz. The answers, and lots more, can be found in my book, The Big Splat.

17. What is the origin of the Moon's craters?

(A) All known craters were formed by meteorite impacts.

(B) Most craters were formed by meteorite impacts, but many volcanic craters have also been found.

(C) Most craters on the Moon are volcanic, but some were formed by meteorite impacts.

(D) They are reservoirs for water that were built by the Moon's inhabitants.

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