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| definition |
- Unconsolidated particles created by the weathering and erosion of rock, by chemical precipitation from solution in water, or from the secretions of organisms, and transported by water, wind, or glaciers.
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| Abstract from DBPedia | Sediment is a naturally occurring material that is broken down by processes of weathering and erosion, and is subsequently transported by the action of wind, water, or ice or by the force of gravity acting on the particles. For example, sand and silt can be carried in suspension in river water and on reaching the sea bed deposited by sedimentation; if buried, they may eventually become sandstone and siltstone (sedimentary rocks) through lithification. Sediments are most often transported by water (fluvial processes), but also wind (aeolian processes) and glaciers. Beach sands and river channel deposits are examples of fluvial transport and deposition, though sediment also often settles out of slow-moving or standing water in lakes and oceans. Desert sand dunes and loess are examples of aeolian transport and deposition. Glacial moraine deposits and till are ice-transported sediments.堆積物（たいせきぶつ、sediment）とは、礫や砂、泥などの岩石片や鉱物、生物遺骸、火山噴出物、水中の溶解物などが、水中ないし大気中の特定の場所に堆積した（積み重なった）もの。一般に、岩石化していないルーズな状態の土砂である。 堆積物は、地表の大気圏、水圏、岩石圏、生物圏が密接に関連する環境のもとで、太陽光や重力等の影響を受けて発生する物理学的、化学的、生物学的な作用（堆積作用）を通じて形成され、その変化過程を解析することで様々な基礎的な地質情報を得ることができる。 堆積物が続成作用によって固結した岩石を堆積岩という。なお未固結の堆積物と堆積岩とを合わせて堆積物と総称する場合がある。 (Source: http://dbpedia.org/resource/Sediment) |
| data publication(s) found by GCMD Science Keywords) | |
