week 11 weathering seds

week 11 weathering seds - Mid-term Friday 40-50 multiple...

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Mid-term Friday 40-50 multiple choice questions Based on readings, lectures only, not labs Calculator not needed No. 2 pencil is needed
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Weathering and Erosion, soils - Weathering: Physical Chemical -Soils and soil erosion
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Weathering – disintegration and decomposition of rock at or near the Earth’s surface Mass Wasting – transfer of rock material down-slope under the influence of gravity Erosion – incorporation and transportation of material by a mobile agent, usually water, wind, or ice
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Weathering - Mechanical and Chemical
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Mechanical Weathering -Breaks rock from larger to smaller pieces while retaining origin rock material characteristics Frost Wedging (shatter) -water expands about 9% on freezing - repeated freeze/thaw breaks rock apart - pronounced in mountainous polar regions -- “talus” often formed at base of cliffs
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Unloading (exfoliation) -Large masses of igneous rock get exposed , slab break loose like layers of onion - sheeting - likely related to pressure relief - creates exfoliation domes (half dome in Yosemite) - also occurs in mine shafts…exploding rocks -
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Biological Activity -Plant roots grow into fractures and can wedge the rock apart -Burrowing animals move fresh material to the surface where it can be attacked - man
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Chemical Weathering -Complex processes that alter internal structures of minerals by removing and/or adding elements - water by far most important chemical weathering agent - water it self is non-reactive, but dissolves substances which are - e.g. dissolved oxygen oxidizes some materials…iron oxides will rust - e.g. CO 2 dissolved in water forms carbonic acid (H 2 CO 3 ) - carbonic acid ionizes to form very reactive H + ion and bicarbonate (HCO 3 - )
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week 11 weathering seds - Mid-term Friday 40-50 multiple...

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