Difference between revisions of "Igneous rock"

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'''Igneous rocks''' are formed when molten [[rock]] is either ejected directly on to the earth's surface ([[extrusive rock]]) or pushed up near the surface and cools beneath it ([[intrusive rock]]). Molten rock beneath the earth's crust is called [[magma]]; when magma is ejected throught the crust it is called [[lava]].
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Page Corrected by Anon.
 
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Anon is legion. Anon does not forgive. Anon does not forget.
Most igneous rocks are composed of an interlocking [[mosaic]] of [[crystal]]s. Lava rocks are often riddled with air holes.
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==Extrusive Igneous==
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Crystals are generally small, often microscopic.
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*[[Obsidian]]
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*[[Basalt]]
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*[[Pumice]]
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==Intrusive Igneous==
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Crystals are generally large and visible to the naked eye. Intrusive igneous rocks are the source of many [[gemstone]]s.
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*[[Granite]]
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*[[Gabbro]]
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*[[Granite Porphyry]]
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Kavanaugh, Pocket Naturalist
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==Sources==
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*Kavanaugh, James. ''Pocket Naturalist - Geology - An Introduction to familiar Rocks, Minerals, Gemstones & Fossils'', Waterford Press: Arizona (2000)
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[[category:Igneous Rocks]]
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Revision as of 07:55, 24 January 2010

Page Corrected by Anon. Anon is legion. Anon does not forgive. Anon does not forget.