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Igneous rock - Wikipedia, the free encyclopedia
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Extrusive and Intrusive Igneous Rocks - home page; Volcanos and Extrusive Igneous Rocks; Batholiths, sills, dikes, and other Intrusive Igneous Rock bodies; Igneous rock recognition and identification; Igneous Rock Formation and Distribution;
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Atlas of Igneous and Metamorphic Rocks; A nice gallery of igneous rocks in thin section. A good way to get a closer look at the common igneous rocks ... Igneous Rocks - Encyclopedia Britannica; A very comprehensive discussion of igneous rocks. For teachers, or high school students;
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Glassy textured igneous rocks are non-crystalline meaning the rock contains no mineral grains. Glass results from cooling that is so fast that minerals do not have a chance to crystallize. This may happen when magma or lava comes into quick contact with much cooler materials near the Earth's surface.
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A photo gallery of intrusive and extrusive rocks by Geology.com ... Igneous rocks are formed from the solidification of molten rock material. There are two basic types: 1) intrusive igneous rocks such as diorite, gabbro, granite and pegmatite that solidify below Earth's surface;
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The three great rock classes--igneous, sedimentary and metamorphic--are introduced with igneous rocks. ... Origin of Igneous Rocks ... Where Igneous Rocks Are Found...
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This web page was constructed to aid undergraduate instruction at the Geology Department of the University of North Carolina. ... Photomicrography and website design by Kent Ratajeski, UNC Ph.D. student. ... Funded by a UNC Instructional Technology grant to Dr. Allen Glazner.
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Igneous Rocks are formed by crystallization from a liquid, or magma. They include two types ... or extrusive igneous rocks form when the magma cools and crystallizes on the surface of the Earth ; ... or plutonic igneous rocks wherein the magma crystallizes at depth in the Earth.
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Igneous rocks make up 95% of the rocks of the crust of the earth. They are also some of the oldest rocks that are found at the surface of the earth. Igneous rocks are classed on the basis of where they form and the compostion of the molten rock.
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