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Ch4 Sec1

Ch4 Sec1. Classifying Rocks. Key Concepts. What characteristics do geologists use to identify rocks? What are the three main groups of rocks?. Key Terms. Rock-forming mineral Granite Basalt Grains Texture Igneous Rock Sedimentary Rock Metamorphic Rock. Ch4 Sec1.

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Ch4 Sec1

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  1. Ch4 Sec1 Classifying Rocks

  2. Key Concepts • What characteristics do geologists use to identify rocks? • What are the three main groups of rocks?

  3. Key Terms • Rock-forming mineral • Granite • Basalt • Grains • Texture • Igneous Rock • Sedimentary Rock • Metamorphic Rock

  4. Ch4 Sec1 • Mineral Composition and Color • Rock-forming minerals: about 20 minerals make up most of the rocks of Earth’s crust • Appendix B p. 806-807 • Granite: is generally a light-colored rock that has high silica content • Basalt: is a dark colored rock that is low in silica

  5. Ch4 Sec1 • Texture • Grains: most rocks are made up of particles of minerals or other rocks • Texture: is the look and feel of the rock’s surface • Grain size • Grain shape • Grain pattern

  6. Ch4 Sec1 • How Rocks Form • Geologists classify rocks into three major groups • Igneous rock: forms from the cooling of magma or lava • Sedimentary rock: forms when particles of other rocks or the remains of plants and animals are pressed and cemented together • Metamorphic rock: forms when as existing rock is changed by heat, pressure, or chemical reactions

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