Lecture - 12 Weathering

Lecture - 12 Weathering - Weathering Exam 1 Average 70...

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Weathering
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Exam 1 Average 70
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Chemical Weathering of Granite Weathering of granite Weathering of potassium feldspar produces clay minerals, soluble salt (potassium bicarbonate), and silica in solution Quartz remains substantially unaltered Weathering of silicate minerals produces insoluble iron oxides and clay minerals
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Chemical Weathering of Granite
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Granite Weathering 2KAlSi3O8 + 2(H+ + HCO3-) + H2O Al2Si2O5(OH)4 + 2K+ + 2HCO3- + 4SiO2 K-feldspar carbonic acid clay mineral bicarbonate silica in solution
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Iron Oxides
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Spheroidal Weathering Video
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What factors control weathering rates?
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Rates of Weathering Mechanical weathering aids chemical weathering by increasing the surface area Important factors Rock characteristics Mineral composition and solubility Physical features such as joints
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Joints and Surface Area
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Rates of Weathering Important factors Climate Temperature and moisture are the most crucial factors Chemical weathering is most effective in areas of warm temperatures and abundant moisture
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Rainfall, Temperature, and Weathering
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Weathering Factors
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Rates of Weathering Differential weathering Caused by variations in composition Creates unusual and spectacular rock formations and landforms
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Arches Video
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