SEDIMENTARY ROCKS

Jun 30th, 2015
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Steps in forming Sedimentary Rocks: 1. WEATHERING- the chemical alteration, physical, and biological breakdown of rocks during exposure to the atmosphere, hydrosphere, and biosphere -two types of weathering: (1) mechanical/physical -requires the application of some physical force or stress to be applied to the rock -- no accompanying changes

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LECTURE 6 SEDIMENTARY ROCKSSteps in forming Sedimentary Rocks:1. WEATHERINGthe chemical alteration, physical, and biological breakdown of rocks during exposure to the atmosphere, hydrosphere, and biosphere -two types of weathering: (1) mechanical/physical-requires the application of some physical force or stress to be applied to the rock -- no accompanying changes to the composition of rocks mechanical breakup increases the rocks surface area and the surface-to-volume ratiosome mechanical weathering processes1) Freezing and thawing- The expansion force of water as it freezes is sufficient to split any mineral or rock. 2) Heating and cooling - Differences in temperature in a rock give rise to differential expansion and contraction. 3) Wetting and drying- The disruption of soil results in the swelling and contracting of soil peds and particles. 4) Grinding or rubbing- Grinding action, or the rubbing of moving rock against each other. 5) Organisms- Action of organisms, including animals and plants reduces the size of rocks and minerals. 6) Unloading - the removal sediments overlying deeply buried rocks by erosion or uplift, results in the exfoliation

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