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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.
THe sedimentary rock can then become metamorphic rock if put under immense pressure and heat. If the metamorphic rock becomes buried deep beneath Earth's surface and melts into magma, the magma would harden and become igneous rock again.