Chapter 3 - Sedimentary Rocks The weathering process...

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Nar Ramirez 3 rd Planet November 15, 2007 Chapter 3 ROCKS: Rock Cycle The rock cycle shows the relationship among the 3 rocks types: igneous, sedimentary, and metamorphic rocks. 1) Magma (parent of all rocks) cools and solidifies (crystallizes) forming igneous rock 2) igneous rock weathers, become transported, and deposited as sediments 3) Sediments through cementation and compaction lithify to form sedimentary rock 4) Sedimentary rock through pressure and temperature become metamorphosed forming Igneous Rocks Igneous rocks form from magma that cools and crystallizes at or near the surfaces and at depth. Two types of igneous rocks are extrusive and intrusive. 1) Extrusive rocks form when lava, which is similar to magma, but has lost most of its gases, makes its way to the surface and solidifies. 2) Intrusive rocks form when magma not reaching the surface cools and solidifies at depth (structure).
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Classifying igneous rocks: Intrusive: Granite, Diortie, Gabbro Extrusive: Obsidian, Pumice, Scoria, Rhyolite, Andesite, Basalt
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Unformatted text preview: Sedimentary Rocks The weathering process produces sediments, which then become lithified to form sedimentary rocks. Lithification is the process of turning sediments into rocks. Classifying sedimentary rocks: Detrital sedimentary rocks are formed from material called detritus. Detitus consists of particles of weathered rock material. The following particle size scale is used to distinguish among detrital sedimentary rocks (gravel, sand, silt, & clay…largest to smallest). Gravel (Rounded – Conglomerates & Angular – Breccias) Sand (Sandstone - ) Silt (Siltstone - ) Clay (Claystone, Mudstone, & Shale - ) Chemical Sedimentary Rocks Result of chemical processes: Acid Dissolving rocks Rocks goes into solution precipitate back to a rock. Limestone – Calcium Carbonate Chalk – Microscopic skeletal remains Coquina Travertine Jasper/Flint/Chert Evaporites...
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Chapter 3 - Sedimentary Rocks The weathering process...

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