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Weathering, Soil, and Mass Movement
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What is Weathering? The breaking down and changing of rocks near Earth’s surface 2
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Mechanical Weathering?
Physical forces break rock into smaller pieces without changing the rock’s composition. 3
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Mechanical Weathering and Surface Area
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Frost Wedging Expansion of freezing water in cracks and crevices
Eventually breaking rocks into pieces Sections of rock that are wedged loose are called talus 5
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Unloading The uplift and erosion of rocks overlying igneous rocks because pressure on rocks is reduce Exfoliation—slabs of outer rock separate and break loose 6
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Biological Activity The activity of plants, burrowing animals, and humans Plant roots wedge into rocks breaking them apart 7
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Chemical Weathering? the transformation of rock into one or more new compounds 8
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Agents and Evidence of Chemical Weathering
Water: most important agent of weathering. It picks up CO2 and SO2 in the air which forms acid rain. 9
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Rate of Weathering How fast the rocks erode Two factors
Rock characteristics Mineral composition and solubility Climate Temperature and moisture Favors high temperature and abundant moisture 10
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