Topic 09_supplement_B&W

Topic 09_supplement_B&W - Topic09 Weathering...

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Geography 211 (Fall 2009) 10/26/09 1 Topic 09 Weathering 1. Introduc?on weathering entrainment transporta/on deposi/on Weathering: Breakdown/altera?on of rocks and minerals at or near Earth’s surface as earth materials interact with atmosphere and water Physical±mechanical weathering: mechanical disintegra?on imposed stresses break rocks apart) Chemical weathering: disintegra?on/weakening involving altera?on of chemical composi?on Biological: includes digging of animals, roo?ng of plants
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Geography 211 (Fall 2009) 10/26/09 2 Factors influencing weathering type/rate: bedrock type joints climate – temperature, precipita?on, freeze‐ thaw cycles Joints in rock leading to block separation Rocks may break up grain by grain (granular disintegration) 2. Physical Weathering Frost Ac)on freezing and expansion up to 9% diurnal/seasonal freezing/thawing produces micro‐±ssures, cracks, flaking
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Geography 211 (Fall 2009) 10/26/09 3 Thermal Expansion minerals expand and contract at different rates coefficient of heat expansion/contraction
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This note was uploaded on 02/04/2010 for the course GEOG 331 taught by Professor Staff during the Fall '08 term at Kansas.

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Topic 09_supplement_B&W - Topic09 Weathering...

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