Igneous_lecture - disorganized atomic structure CLASSIFYING...

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Solidifying Magma texture : sizes, shapes, and arrangement of mineral grains (crystals) Texture and Cooling History WHERE? HOW FAST? TEXTURE below the surface cooled slowly large crystals cooled quickly quenched above the surface small crystals above the surface, under water no crystals (glass)
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Where does the magma that feeds volcanoes come from? (A) isolated chambers of magma in the crust and mantle; (B) a universal pool of magma in the completely molten mantle; (C) the liquid core of the earth; (D) all of the above. Question Making Magma
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(Figure 5-4) obsidian http://volcanoes.usgs.gov/
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Unformatted text preview: disorganized atomic structure CLASSIFYING IGNEOUS ROCKS felsic mafic TEXTURE gabbro BASALT GRANITE large crystals (intrusive) rhyolite small crystals (extrusive) MINERAL COMPOSITION Underwater flows, pillow basalt (Olympic National Park) felsic mafic TEXTURE BASALT large crystals (intrusive) small crystals (extrusive) CLASSIFYING IGNEOUS ROCKS MINERAL COMPOSITION CHARACTERISTICS OF BASALT extrusive = volcanic dense, dark-colored mafic composition (Ca plagioclase, pyroxene, olivine) low-viscosity lava [cross section] [cross section]...
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Igneous_lecture - disorganized atomic structure CLASSIFYING...

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