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Formation of rocks
出典:『Wikipedia』 (2011/04/05 21:36 UTC 版)
The three main ways rocks are formed:
- Sedimentary rocks are formed through the gradual accumulation of sediment: for example, sand on a beach or mud on a river bed. As the sediment is buried it is compacted as more and more material is deposited on top. Eventually the sediment will become so dense that it is essentially rock. This process is known as lithification.
- Igneous rocks are rocks which have crystallized from a melt or magma. The melt is made up of various components of pre-existing rocks which have been subjected to melting either at subduction zones or within the Earth's mantle. The melt is hot and so passes upward through cooler country rock. As it moves it cools and various rock types will form through a process known as fractional crystallization. Igneous rocks can be seen at mid ocean ridges, areas of island arc volcanism or in intra-plate hotspots.
- Metamorphic rocks are rocks which once existed as igneous or sedimentary rocks but have been subjected to varying degrees of pressure and heat within the Earth's crust. The processes involved will change the composition and fabric of the rock and their original nature is often hard to distinguish. Metamorphic rocks are typically found in areas of mountain building.
「Formation of rocks」の部分一致の例文検索結果
該当件数 : 3件
a formation of mounds consisting of rocks, called {sheepback}発音を聞く 例文帳に追加
羊背岩という岩石の小山の群 - EDR日英対訳辞書
To provide a load-carrying platform of a dump truck preventing the formation of a weir preventing the flow of cargoes such as rocks due to biting of rocks when dumping the rocks.例文帳に追加
積荷の岩石等をダンプするときに、岩石等が噛み合って流れを阻止するような堰を作ることがないダンプカ−の荷台の提供 - 特許庁
the branch of geology that studies rocks: their origin and formation and mineral composition and classification発音を聞く 例文帳に追加
岩を研究する地質学の分野：それらの起源、形状、組成および分類 - 日本語WordNet
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