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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.
Even deeper burial and increased heat eventually melts some of the metamorphic rock, forming new magma and starting the cycle over. Rock Cycle Diagram. Why does the rock cycle work the way it does? Part of understanding the rock cycle is realizing that the greater the depth within the earth, the higher the temperature and the greater the pressure.