Concept information
Terme préférentiel
magmatic rock
Définition
- Igneous rock, or magmatic rock, is one of the three main rock types, the others being sedimentary and metamorphic. Igneous rocks are formed through the cooling and solidification of magma or lava. The magma can be derived from partial melts of existing rocks in either a planet's mantle or crust. Typically, the melting is caused by one or more of three processes : an increase in temperature, a decrease in pressure, or a change in composition. Solidification into rock occurs either below the surface as intrusive rocks or on the surface as extrusive rocks. Igneous rock may form with crystallization to form granular, crystalline rocks, or without crystallization to form natural glasses. Igneous rocks occur in a wide range of geological settings: shields, platforms, orogens, basins, large igneous provinces, extended crust and oceanic crust. (Adapted from: https://en.wikipedia.org/wiki/Igneous_rock)
Concept générique
Concepts spécifiques
Synonyme(s)
- Igneous rock
Traductions
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français
-
roche ignée
URI
http://data.loterre.fr/ark:/67375/QX8-1DC2HQDP-3
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