ESS7 Midterm 2 Study Guide - ESS7 Midterm 2 Study Guide...

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ESS7 Midterm 2 Study Guide Various stages of the Rock Cycle: Weathering o Physical/mechanical weathering Physical breaking of rock into smaller and smaller pieces without changing the mineralogy Jointing: fractures or cracks formed by plate tectonic stresses or changes in pressure. Sheeting: Uplift and erosion produces fractures parallel to surface Frost wedging: Liquid water in rock fractures expands when freezes, breaking rock apart and producing talus slopes. Root wedging o Chemical weathering Breaks down rock components and internal structures of minerals (Most important agent=water) Oxidation. Rocks rust (olivine and pyrite bc rich in iron). Dissolution: Soluble in water (Halite) or weak acid (calcite) Responsible for formation of clays Feldspar and quartz last to weather Beach sand mostly made of quartz Erosion and transport by wind, water, or ice Deposition Lithification Describe the four steps to sedimentary rock formation. (All weathering products become sedimentary rock) Chemical and mechanical weathering break down rock o Produces raw material Erosion agents transport sediment o Affects shape, composition, and sorting (Size distribution) of particles Deposition occurs when solid particles settle out or when ions in solution are precipitated by inorganic or biological processes o Caused by a change in energy of transport system Lithification/Diagenesis- burial and transformation into sedimentary rock o Transformation of loose sediment to rock Describe the difference between chemical and physical weathering (including different mechanisms and weathering products)
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  • Winter '15
  • Geology, Mineralogy, High Energy, chemical weathering, tectonic environment, mechanical weathering break, Mechanical weathering increases

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