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Death Valley California

Death Valley California. Ms Politano at Ube Hebe Crater (Volcano explosion). Rattlesnake under an igneous rock. Rocks Vs Minerals. Minerals Composed of Elements ALWAYS INORGANIC Classification depends on the 8 main characteristics we discussed in class. Rocks Composed of Minerals

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Death Valley California

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  1. Death Valley California Ms Politano at Ube Hebe Crater (Volcano explosion) Rattlesnake under an igneous rock

  2. Rocks Vs Minerals • Minerals • Composed of Elements • ALWAYS INORGANIC • Classification depends on the 8 main characteristics we discussed in class • Rocks • Composed of Minerals • Can contain plant and animal particles • Classification depends on their mineral and chemical composition, texture and the process of formation..

  3. Classification of Igneous Rocks • Intrusive: crystallized from slowly cooling magma intruded within the Earth’s crust; e.g. granite, gabbro. Granite Gabbro

  4. Intrusive: Course-grained, interlocking Rock Texture Intrusive rocks form under ground. These normally contain large crystals because they cool slowly Fig. 5.1

  5. Classification of Igneous Rocks • Extrusive: crystallized from rapidly cooling lava on the surface of the Earth. Very quick cooling means very small crystals Rhyolite Basalt

  6. Intrusive: Course-grained, interlocking Extrusive: Fine-grained, small crystals, often glassy Rock Texture Fig. 5.1

  7. Genetic Classification of Igneous Rocks • Extrusive: … or erupted as pyroclastic material, i.e., broken pieces of magma ejected and cooled in the air. Ash Pumice Scoria

  8. Formation of Igneous Rocks Pyroclasts Extrusive Intrusive Porphyry: partially crystalline Fig. 5.3

  9. Felsic Igneous Rocks:Igneous rocks, light colored, rich in mineralshighin silicaandlow iniron and magnesium. They include: Granite Rhyolite

  10. Mafic Igneous Rocks:Igneous rocks, dark color, rich in mineralslowin silicaandhigh iniron and magnesium. They include: Gabbro Basalt

  11. Create a “T” Chart • Compare intrusive and extrusive igneous rocks • How do they form? • What are their characteristics? • What are some examples?

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