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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.
Anything can happen in the Rock Cycle. 1  Igneous rocks can be subjected to heat, pressure, and the action of fluids to form metamorphic rocks. 2  Igneous rocks can be re-melted, forming a new generation of igneous rocks. 3  Sedimentary rocks can be weathered and eroded to form a new generation of sedimentary rocks. Sedimentary rocks may eventually be heated enough to melt, forming a new generation of igneous rocks (although technically they'd be metamorphic by the time they melted). Metamorphic rocks can be weathered and eroded to form sedimentary rocks.