The rock cycle is the process through which the different types of rocks–igneous, metamorphic, and sedimentary–change into one another over time when exposed to environmental conditions. For example: Igneous rocks are broken down by erosion and the resulting materials are eventually formed into sedimentary rock. As a result of heat and pressure that sedimentary rock is formed into metamorphic rock which in turn melts into magma which cools to form igneous rock.
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