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Four basic processes are involved in the formation of a clastic sedimentary rock: weathering (erosion)caused mainly by friction of waves, transportation where the sediment is carried along by a current, deposition and compaction where the sediment is squashed together to form a rock of this kind.
During the rock cycle process, sedimentary rocks can become metamorphic or igneous rocks as they are buried in the planet's crust with younger layers of rock above them. Eventually they can metamorphose under heat and pressure at great depth, or melt to form new magma. Uplifting of rock layers by earth forces can bring rocks near the surface again at any point in the cycle. Igneous and metamorphic rocks can weather to form sediments that later become sedimentary rocks. Igneous rocks can metamorphose when subjected again to heat and pressure. Metamorphic rocks can metamorphose in repeat episodes or melt into magma, which later cools to form igneous rocks.