出典:Wiktionary
sedimentary rock (countable かつ uncountable, 複数形 sedimentary rocks)
出典:Wikipedia
出典:『Wikipedia』 (2011/06/28 17:31 UTC 版)
Sedimentary rock is a type of rock that is formed by sedimentation of material at the Earth's surface and within bodies of water. Sedimentation is the collective name for processes that cause mineral and/or organic particles (detritus) to settle and accumulate or minerals to precipitate from a solution. Particles that form a sedimentary rock by accumulating are called sediment. Before being deposited, sediment was formed by weathering and erosion in a source area, and then transported to the place of deposition by water, wind, mass movement or glaciers which are called agents of denudation.