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USGS CMG InfoBank: Sediment

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Comment: 02:31 - 03:22 (00:51)
Source: Annenberg/CPB Resources - Earth Revealed - 17. Sedimentary Rocks: The Key to Past Environments
Keywords: sediment, "mechanical weathering", "chemical weathering", erosion, wind, water, ice, "biological activity", sand, dune, beach, pebble, stream, shell, "sea floor", compaction, cementation, "sedimentary rock"

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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