Igneous rock

Jun 30th, 2015
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Igneous rock (derived from the Latin word igneus meaning of fire, from ignis meaning fire) is one of the three main rock types, the others being sedimentary and metamorphic rock. Igneous rock is formed through the cooling and solidification of magma or lava. Igneous rock may form with or without crystallization, either below the surface as intrusive (plutonic)

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Igneous rockFrom Wikipedia, the free encyclopedia(Redirected from Igneous rocks)Jump to: navigation, search Geologic provinces of the world (USGS) ShieldPlatformOrogenBasinLarge igneous provinceExtended crustOceanic crust: 020 Ma2065 Ma>65 MaIgneous rock (derived from the Latin word igneus meaning of fire, from ignis meaning fire) is one of the three main rock types, the others being sedimentary and metamorphic rock. Igneous rock is formed through the cooling and solidification of magma or lava. Igneous rock may form with or without crystallization, either below the surface as intrusive (plutonic) rocks or on the surface as extrusive (volcanic) rocks. This magma can be derived from partial melts of pre-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. Over 700 types of igneous rocks have been described, most of them having formed beneath the surface of Earth's crust. These have diverse properties, depending on their composition and how they were formed.Contents1 Geological significance2 Morphology and setting 2.1 Intrusive igneous rocks2.2 Extrusive igneous rocks2.3 Hypabyssal igneous rocks3 Classification 3.1 Texture3.2 Chemical classification3.3 History of classification4 Mineralogical classification 4.1 Example of classification5 Magma origination

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