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

18. Although the Apollo missions detected no water on the Moon, two later satellites have found a possible reserve of water ice. Where is it?

(A) At the Moon's core.

(B) In underground caves.

(C) In craters near the poles that are permanently shadowed from the Sun.

(D) Underneath dried-up river beds called rilles.

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