What kind of rock is the earth's crust made of
- What type of rock is the earth's crust made of
- What type of rock is the earth's crust made out of
- What type of rock is the earth's crust mostly made of
- What rock is most of the earth's crust made of
- What two types of rock is the earth's crust made up of
- The earth's continental crust is mostly made of what kind of rock
- The earth's oceanic crust is mostly made of what kind of rock
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