diagenesis
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The formation of sedimentary rock by diagenesis. Sand and other sediment grains are compacted and cemented together.
In geology, the physical, chemical, and biological processes by which a sediment becomes a sedimentary rock. The main processes involved include compaction of the grains, and the cementing of the grains together by the growth of new minerals deposited by percolating groundwater. As a whole, diagenesis is actually a poorly understood process.
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