How do sedimentary rocks form?

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chemistry of sedimentary rocks — sedimentary rock Figure 1: Chemical composition of sedimentary rocks.

Sedimentary rocks are formed from deposited and lithified mineral material. This process, known as lithification, converts loose sediment grains into rock. Lithification can occur at the time of deposition or later and involves processes like cementation, where minerals bind the grains together. Additionally, chemical reactions within the sediment and compaction under pressure contribute to the transformation of sediment into solid rock. Sedimentary rocks are produced by the weathering of pre-existing rocks, followed by the transportation and deposition of these weathered products as sediment. This sediment is then cemented, compacted, and solidified.123