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In short, the rock cycle is the name for the processes that forms and recycles the different types or rocks on our planet. Rocks begin the cycle as igneous rocks, erode into sedimentary rocks then change into metamorphic rocks, finally the rocks melt back to magma and start the process again.
Rock cycle: Processes through which rocks change from one type to another, typically through melting, metamorphism, uplift, weathering, burial, or other processes. Sedimentary rock: Rock formed from compressed and solidified layers of organic or inorganic matter.