Ch06_Outline

Ch06_Outline - Chapter 6 Weathering and Soil Earth's...

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1 Chapter 6 Weathering and Soil 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 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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2 Frost wedging Figure 6.3 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 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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This note was uploaded on 07/17/2008 for the course GS 121 taught by Professor Leavell during the Fall '07 term at Ohio State.

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Ch06_Outline - Chapter 6 Weathering and Soil Earth's...

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