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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.
There are also other type of specific sedimentary rocks, like for example the ones formed in hot springs. Most of the solid surface of our planet (very roughly 70%) is represented by sedimentary rocks â but if you start to go deep enough, they are replaced by igneous and metamorphic. As I mentioned with the biochemical rocks, fossils can become rocks in time.