the definition of Rock
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A rock is a naturally occurring solid. It is made of minerals (which are crystalline), or other mineral-like substances. The Earth's outer solid layer, the lithosphere, is made of rock. That means the Earth's crust is made of rock. The different minerals in the rocks make different kinds of rock.
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the solid mineral material forming part of the surface of the earth and other similar planets, exposed on the surface or underlying the soil.
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