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ShareIgneous rocks are formed when molten rock (magma) cools and solidifies, with or without crystallization, either below the surface as intrusive (plutonic) rocks or on the surface as extrusive (volcanic) rocks..
For more information about the topic Igneous rock, read the full article at Wikipedia.org, or see the following related articles:
Volcanic rock — Volcanic rock is an igneous rock of volcanic origin. Volcanic rocks are usually fine-grained or aphanitic to glassy in texture. They often contain ... > read more
Crust (geology) — In geology, a crust is the outermost layer of a planet.
The crust of the Earth is composed of a great variety of igneous, metamorphic, and ... > read more
Metamorphic rock — Metamorphic rock is the result of the transformation of a pre-existing rock type, the protolith, in a process called metamorphism, which means ... > read more
Continental crust — The continental crust is the layer of granitic, sedimentary and metamorphic rocks which form the continents and the areas of shallow seabed close to ... > read more
Mid-ocean ridge — A mid-ocean ridge or mid-oceanic ridge is an underwater mountain range, formed by plate tectonics. This uplifting of the ocean floor occurs when ... > read more
Lithosphere — The lithosphere is the solid outermost shell of a rocky planet. On the Earth, the lithosphere includes the crust and the uppermost layer of the ... > read more
Basalt rock — Basalt is a common gray to black volcanic rock. It is usually fine-grained due to rapid cooling of lava on the Earth's surface. It may be porphyritic ... > read more
Sedimentary rock — Sedimentary rock is one of the three main rock groups (along with igneous and metamorphic rocks) and is formed in four main ways: by the deposition ... > read more
Feldspar mineral — Feldspar is the name of a group of rock-forming minerals which make up as much as 60% of the Earth's crust. Feldspars crystallize from magma in both ... > read more
Note: This page refers to an article that is licensed under the GNU Free Documentation License. It uses material from the article Igneous rock at Wikipedia.org. See the Wikipedia copyright page for more details.
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