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Section 8-1

Section 8-1. The Rock Cycle. Hutton’s Big Idea. Uniformitarianism Geologic process that occur today also occurred in the past Example: erosion today also occurred the same way in the past. Types of Rocks. There are three main groups of rocks Igneous Caused by volcanic activity

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Section 8-1

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  1. Section 8-1 The Rock Cycle

  2. Hutton’s Big Idea • Uniformitarianism • Geologic process that occur today also occurred in the past • Example: erosion today also occurred the same way in the past

  3. Types of Rocks • There are three main groups of rocks • Igneous • Caused by volcanic activity • Granite, obsidian, pumice • Has crystals, looks like glass, or has holes • Sedimentary • When sediments (small particles of rock) get cemented or pressed together • Only type of rock to contain fossils • Sandstone, limestone • Can see particles or fossils • Metamorphic • Rock formed by intense heat, pressure, and chemical changes • Serpentine, marble • Green, striations (lines)

  4. The Rock Cycle • Rocks are “recycled” from one type of rock to another due to forces on earth • Volcanic Activity • Molten rock (magma and lava) cool above or below earth’s surface • Erosion • Weathering causes rock to wear down • Deposition • Particles are transported by water and settle • Heat and Pressure • The deeper rock is, the higher the pressure and heat. This changes the chemistry of the rock • Melting • Heat melts rock into lava and magma

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