Ch06_As Presented

Ch06_As Presented - Chapter 6 Weathering and Soil Earth's...

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Chapter 6 Weathering and Soil
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Earth’s external processes ± Weathering – the physical breakdown (disintegration) and chemical alteration (decomposition) of rock at Earth’s surface ± Mass wasting – the transfer of rock and soil downslope under the influence of gravity ± Erosion – the physical removal of material by mobile agents such as water, wind, ice, or gravity
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Weathering ± Two types Mechanical weathering – breaking of rocks into smaller pieces Types of mechanical weathering Frost wedging Unloading Thermal expansion Biological activity
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Frost wedging Figure 6.3
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Weathering ± Chemical weathering Breaks down rock components and internal structures of minerals Most important agent is water Responsible for transport of ions and molecules involved in chemical processes
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Weathering ± Major processes of chemical weathering Dissolution Aided by small amounts of acid in the water Oxidation Any reaction when electrons are lost from one element Hydrolysis The reaction of any substance with water Hydrogen ion attacks and replaces other ions
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± Alterations caused by chemical weathering Decomposition of unstable minerals
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Ch06_As Presented - Chapter 6 Weathering and Soil Earth's...

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