igneous rock

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igneous rock

The Columbia Encyclopedia, Sixth Edition | 2008 | The Columbia Encyclopedia, Sixth Edition. Copyright 2008 Columbia University Press. (Hide copyright information) Copyright

igneous rock see rock .

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igneous rock

World Encyclopedia | 2005 | © World Encyclopedia 2005, originally published by Oxford University Press 2005. (Hide copyright information) Copyright

igneous rock One of three major classes of rock produced by the cooling and solidifying of molten magma. All igneous rocks are crystalline and most resist erosion. Extrusive, or volcanic, igneous rocks, such as basalt, form by the rapid cooling of molten material at the surface. Intrusive, or hyperbyssal, rocks, such as dolerite, form in sills or dykes at intermediate depth. Plutonic rocks, such as granite, form in batholiths at greater depth. The major chemical constituent is silica. Acid rocks contain high amounts of quartz, feldspar or mica, and are light coloured. Basic rocks are darker and contain 45–55% silica, including minerals such as hornblende. See also metamorphic rock; sedimentary rock
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igneous

A Dictionary of Earth Sciences | 1999 | | © A Dictionary of Earth Sciences 1999, originally published by Oxford University Press 1999. (Hide copyright information) Copyright

igneous Applied to one of the three main groups of rock types (igneous, metamorphic, and sedimentary), to describe those rocks that have crystallized from a magma.
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AILSA ALLABY and MICHAEL ALLABY. "igneous." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. 16 Dec. 2009 <http://www.encyclopedia.com>.

AILSA ALLABY and MICHAEL ALLABY. "igneous." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. (December 16, 2009). http://www.encyclopedia.com/doc/1O13-igneous.html

AILSA ALLABY and MICHAEL ALLABY. "igneous." A Dictionary of Earth Sciences. 1999. Retrieved December 16, 2009 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O13-igneous.html

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igneous rock. (Image by Stan Zurek, GFDL)

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