Chapter 9_ Weathering & Erosion

Chapter 9_ Weathering & Erosion - Weathering &...

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Chapter 9 Chapter 9 Old geologists don’t die they just weather away! Old geologists don’t die they just weather away!
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Erosion is the loosening and transport of earthen materials by the action of gravity, water, and wind at the earths surface (it is exclusively a physical activity). Weathering is the combined physical and chemical breakdown and alteration of rocks and minerals at or near the earth's surface (generally in-place/in-situ) into byproducts that are more in equilibrium with the conditions found on the earth’s surface.
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Why Weathering Occurs? Why Weathering Occurs? • Materials formed in the earth's interior are usually in disequilibrium with conditions on the earth’s surface. Some minerals and rocks are more susceptible to weathering then others which results in differential weathering.
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Types of Weathering Types of Weathering Mechanical Weathering – breakdown of rocks into smaller and smaller pieces with no change in chemical composition. Chemical Weathering – breakdown of rocks by chemical agents. The chief chemical agent is water. Biological Weathering – the disintegration of rock and minerals due to the chemical and/or physical agents of organisms.
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Weathering Weathering • Plays a very important role in the rock cycle with respect to the formation of clastic sedimentary rocks. • Concentrates economic minerals for mining. • Creates soil for agriculture.
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Soil Erosion Agents Soil Erosion Agents • Gravity (mass wasting - talus slopes) • Water (fluvial) • Wind (eolian) • Glacial • Waves (kinetic) • Trail erosion (hiking) • Earth Quakes (tectonic)
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Factors that affect the Rate of Weathering Factors that affect the Rate of Weathering • Climate • Oxidation State • Biological Influences
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Climate -Temperature/Rainfall Relationships Climate -Temperature/Rainfall Relationships
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Mechanical/Physical Weathering Mechanical/Physical Weathering PHYSICAL WEATHERING : disintegration that breaks up the
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This note was uploaded on 04/28/2008 for the course CE 200 taught by Professor Unknown during the Fall '07 term at University of Alabama at Birmingham.

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Chapter 9_ Weathering & Erosion - Weathering &...

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