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1) Weathering - physical and chemical breakdown of surface materials a) Physical or mechanical weathering i) Uplift and expansion of rock (1) Jointing/fracturing (2) Exfoliation sheeting ii) Frost wedging iii) Biologic activity iv) Physical Sediment (clastic/detrital) (1) Gravel (pebbles, cobbles, boulders)

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WEATHERING, EROSION, AND SOILLECTURE OUTLINE1) Weathering - physical and chemical breakdown of surface materialsa) Physical or mechanical weatheringi) Uplift and expansion of rock(1) Jointing/fracturing(2) Exfoliation sheetingii) Frost wedgingiii) Biologic activityiv) Physical Sediment (clastic/detrital)(1) Gravel (pebbles, cobbles, boulders)(2) Sand (2mm 0.062mm)(3) Silt (<.062mm) and clay (<.0039mm in size)b) Chemical weatheringi) Oxidationii) Hydrolysisiii) Dissolution(1) Dissolved ions(2) Carried in wateriv) Mineral alteration during chemical weathering(1) Feldspars to clays (hydrolysis)(2) Ferromagnesium minerals to hematite (oxidation)(3) Carbonates and quartz (dissolution)c) Effects of weatheringi) Sedimentii) Differential weathering and topography iii) Karst(1) Soluble bedrock(2) Caves, caverns, sinkholesd) Rates of weatheringi) Climate (dry

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