12rocks - Rocks I. Igneous II. Sedimentary III.Metamorphic...

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1 1 Rocks I. Igneous II. Sedimentary III.Metamorphic IV.Rock Cycle 2 Magma: molten rock material Lava: magma associated with a volcano Igneous Rocks ht p:/ www.21stcenturyhawai .com/events/lava.jpg Igneous Rocks: rocks formed from cooling of magma 3 Igneous Rocks Extrusive: reach surface still molten Intrusive: cool and solidify below the surface (Plutonic) 4 Igneous Rocks Granite: high in quartz and other light minerals, low in iron and magnesium 5 Igneous Rocks Extrusive igneous rocks: cool rapidly, fine-textured Intrusive igneous rocks: cool slowly, coarse- textured Granite Rhyolite 6 Igneous Rocks Extrusive igneous rocks: cool rapidly, fine-textured ht p:/ www.gsw.edu/~tjw/basalt.jpg ht p:/ www.gov.mb.ca/itm/mrd/geo/of-pge/images/gabbro.jpg Intrusive igneous rocks: cool slowly, coarse- textured Gabbro Basalt 7 Igneous Rocks LOW IN DARK MINERALS HIGH IN DARK MINERALS EXTRUSIVE Rhyolite Basalt INTRUSIVE Granite Gabbro Mafic minerals • dark in color • high in magnesium and iron silicates
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This note was uploaded on 04/21/2008 for the course GEOL 101 taught by Professor Jeeze during the Winter '08 term at San Diego State.

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12rocks - Rocks I. Igneous II. Sedimentary III.Metamorphic...

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