Topic 09_colour

Topic 09_colour - Topic09 Weathering 1.Introduc>on...

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Geography 211 (Fall 2009) 10/22/09 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) 10/22/09 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) 10/22/09 3 Thermal Expansion minerals expand and contract at different rates
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Topic 09_colour - Topic09 Weathering 1.Introduc>on...

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