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What type of rock comprises most of the exposed surface of earth (roughly 75%) but not the volume and why?

User Tpdietz
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The type of rock that comprises most of the exposed surface of the Earth (around 75%) is sedimentary rock. However, the majority of the Earth's volume is composed of denser igneous rocks found in the mantle and core. Sedimentary rocks are more prevalent on the surface due to the continuous cycle of weathering, erosion, and deposition.

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