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Compared with Earth, the Moon is strongly short of which materials?
AIron and other metals
BSilicon and oxygen
CCarbon and nitrogen
DCalcium and sodium
Answer & Solution
Correct answer: A. Iron and other metals
1. The Moon's average density is only about 3.3 grams per cubic centimeter.
2. That low value means it is made almost entirely of silicate rock.
3. It is depleted in iron and the other metals that sank into Earth's core.
4. Silicon and oxygen are exactly what silicate rock is built from, so those are plentiful.
_Source: OpenStax Astronomy (CC BY 4.0), section 9.1 General Properties of the Moon_
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