Difference between revisions of "Igneous rock"

Revision as of 13:55, January 24, 2010

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

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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]].
+Page Corrected by Anon.
+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.
-==Extrusive Igneous==
-Crystals are generally small, often microscopic.
-*[[Obsidian]]
-*[[Basalt]]
-*[[Pumice]]
-==Intrusive Igneous==
-Crystals are generally large and visible to the naked eye. Intrusive igneous rocks are the source of many [[gemstone]]s.
-*[[Granite]]
-*[[Gabbro]]
-*[[Granite Porphyry]]
-Kavanaugh, Pocket Naturalist
-==Sources==
-*Kavanaugh, James. ''Pocket Naturalist - Geology - An Introduction to familiar Rocks, Minerals, Gemstones & Fossils'', Waterford Press: Arizona (2000)
-[[category:Igneous Rocks]]