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Our transcription: Sediment is the product of mechanical and chemical weathering and of erosion by wind, water, and ice. Biological activity also plays a role. Sediment may be deposited in the form of sand building up as a dune, or a beach, as pebbles piling up in a stream, or shells and organic matter accumulating on the ocean floor. When a thick pile of sediment accumulates, the particles near the base of the pile are compacted under the overlying deposits. Eventually, they are cemented together to form a solid aggregate rock.
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