Rock cycle has no end ,it continues over and over. Magma is the first phase of the igneous portion of the cycle when magma cools an crystallizes into igneous rock. The rock may be brought to the surface by natural mivements of the earth. Pieces of rock at the surface are constantly worn down to smaller piecees by the process of weathering and erosion ,becomes sediments . The sediment may become compacted an cemented into sedimentary rock. Existing rock can get extreme heat and pressure and becomes metamorphic rock