Percent by Mass (%)
50
45
40
1.
3.5
30
15
10
in
5
0
47
43
Oxygen
27
20
Composition of Earth and Moon
2
19
Silicon Magnesium
5
10
Iron
Element
4
3
☐ Earth's Crust ☐ Moon's Crust
8
3
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Calcium Aluminum Other
Elements
The graph above shows the composition of Earth's crust and the Moon's crust.
For which element is there the greatest difference between the percent by mass on
the Moon and the percent by mass on Earth? Explain your answer.
2.
A common theory for the origin of the moon is that much of it is made of pieces of
Earth ejected after a collision with another celestial body. Does the graph support
this theory? Explain your answer.