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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 Ideal Rock Cycle. 1  Igneous rocks form when molten rock (magma) invades the crust. 2  They break down by weathering and the breakdown products are transported by erosion. 3  The breakdown products are deposited to form sedimentary rocks. 4  Sedimentary rocks are buried, subjected to heat, pressure, and the action of fluids.