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Rock Cycle “The Rocks of the World Go Round and Round” (sung to the song “wheels go round”) I. Three Types of Rocks • Igneous Rocks • Sedimentary Rocks • Metamorphic Rocks A. Igneous Rocks • Formed from molten rock • Most abundant rocks • Molten rock below the surface is called magma Common Igneous Rocks: Granite Obsidian Basalt Pumice Intrusive or Extrusive? • Intrusive—cools • Extrusive—cools slowly below the quickly on the surface—large mineral surface—small mineral grains (granite) grains (obsidian) Igneous rocks can form at hot spots, divergent plate boundaries and convergent plate boundaries B. Sedimentary Rocks • Physical weathering breaks rocks into small pieces which are pressed together • Chemical weathering dissolves materials into a water solution which evaporates Common Sedimentary Rocks Coal Sandstone Limestone Halite (Rock Salt) Fossiliferous Limestone Formed different ways • Clastic - Made from broken fragments (ex: sandstone, breccia) • Chemical - Precipitated from solution (ex: limestone, rock salt) • Organic - Formed from living things (ex: coal, fossil limestone) C. Metamorphic Rocks • Rocks change due to temperature and pressure (do not completely melt) Common Metamorphic Rocks granite gneiss shale slate sandstone quartzite Foliated or Non-foliated? • Foliated—grains line up in parallel stripes Gneiss • Non-foliated— grains change but don’t form bands Marble II. Rock Cycle • The rock cycle is not a one-way cycle. • It can go in many directions. Rock Jokes • What is a rock’s favorite cereal? • What is a rock’s favorite transportation? • What is a rock’s favorite music? • How do rocks wash their clothes?