The rock cycle is a continuous process. Igneous rocks form from the solidification of magma and magma can be formed from the melting of igneous, sedimentary, or metamorphic rocks. Sedimentary rocks can be formed from the weathering and erosion of igneous, sedimentary, and metamorphic rocks. Metamorphic rocks form when heat and or pressure are applied to a metamorphic, igneous, or sedimentary rock. Each type of rock forms from some part of an old rock that has been somehow changed into a different type of rock. But for these changes to occur there needs to be some type of movement; that's where plate tectonics come in handy. Without plate tectonics no rocks would be pushed down, compacted, cemented, or pushed up. This means that all rocks would be stagnant and that means that no change would occur which would completely discard almost the entire rock cycle.
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