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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.
The Basics of the Rock Cycle There are three different types of rocks that make up the Earth: metamorphic, igneous and sedimentary. As the Earth renews its crust, the sedimentary rocks become metamorphic and the metamorphic rocks become igneous. The igneous rocks can be broken up into sediments that then make them a part of the sedimentary classification of rocks.