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BookmarkIgneous 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 moreNote: 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.
