Of the three major rock types (sedimentary, igneous, and metamorphic), sedimentary rock is the least voluminous rock in the crust of Earth.

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Sedimentary rocks cover a large area of the Earth's surface but are relatively thin compared to the other two types, making up only about 5% of the Earth's crust by volume. Igneous and metamorphic rocks make up the bulk of the crust.

Of the Three Major Rock Types (Sedimentary, Igneous, and Metamorphic)