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What is the crust?
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The crust of the Earth is composed of a great variety of igneous, metamorphic, and sedimentary rocks. The crust is underlain by the mantle. The upper part of the mantle is composed mostly of peridotite, a rock denser than rocks common in the overlying crust.
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In geology, the crust is the outermost solid shell of a rocky planet, dwarf planet, or natural satellite. It is usually be distinguished from the underlying Mantle by its chemical makeup....
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