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They start out as some other type of rock but have been substantially changed from their original igneous, sedimentary, or earlier metamorphic form.

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Sedimentary rocks are formed from deposits of pre-existing rocks or pieces of once-living organism that accumulate on the Earth's surface.

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Intrusive, or plutonic, igneous rock forms when magma is trapped deep inside the Earth.

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Magma is released. Melting, heat, and pressure is happening.

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Sedimentary, igneous, and metamorphic. Each of these rocks are formed by physical changes—such as melting, cooling, eroding, compacting, or deforming—that are part of the rock cycle

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The three processes that change one rock to another are crystallization, metamorphism, and erosion and sedimentation. Any rock can transform into any other rock by passing through one or more of these processes. This creates the rock cycle.