10F_k_SedRx - 's surface Physicalweathering...

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Weathering   - the physical breakdown and chemical alteration of rocks at the earth's  surface Physical weathering - produces smaller versions of same rocks and rock-forming minerals   Processes: frost wedging, thermal expansion/contraction, biological activity,  unloading/sheeting
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Chemical weathering - dissolves minerals or produces new minerals Oxidation 4 Fe   +   3O 2     =   2Fe 2 O 3   (Iron oxide)
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Dissolution CaCO 3    +   (H +   +  HCO 3 )   =   Ca 2+     +    2HCO 3 - Calcite         carbonic acid               dissolved in water
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Hydrolysis 2KAlSi 3 O 8   + 2 (H +   +  HCO 3 )   +  H2O     =       feldspar                   Al 2 Si 2 O 5 (OH) 4    +   2HCO 3 -      4SiO 2                      clay (kaolinite)
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Differential weathering  -  rocks and minerals weather at different rates high-T minerals weather most easily - more strong Si-O bonds
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Erosion  - Physical removal of  material by mobile agents such  as water, wind, or ice
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Sedimentary Rocks Two types (1) Detrital or clastic  - deposit of solid particles derived from physical  and chemical weathering - classified according to particle size
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