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Weathering, Soil, and Mass Movement

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Presentation on theme: "Weathering, Soil, and Mass Movement"— Presentation transcript:

1 Weathering, Soil, and Mass Movement
1

2 What is Weathering? The breaking down and changing of rocks near Earth’s surface 2

3 Mechanical Weathering?
Physical forces break rock into smaller pieces without changing the rock’s composition. 3

4 Mechanical Weathering and Surface Area

5 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

6 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

7 Biological Activity The activity of plants, burrowing animals, and humans Plant roots wedge into rocks breaking them apart 7

8 Chemical Weathering? the transformation of rock into one or more new compounds 8

9 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

10 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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