ch 5 and 6

ch 5 and 6 - Sedimentary Rocks Chemical weathering...

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Sedimentary Rocks Chemical weathering – decomposition or dissolution of Earth materials Physical/mechanical weathering - cracking, scratching, crushing, abrasion, or other physical disintegration of Earth materials o Clasts - broken pieces Rock fragments Mineral grains (whole crystals or fragments of crystals) Products of weathering o Sediments (loose grains and chemical residues of rocks, minerals, plants, or animals) o Aqueous solutions (mixtures of water and other chemcials formed by dissolution and chemical decay of rocky or organic material) Texture of sediment or sedimentary rock o Grain shape -- affected by transportation Fresh rock fragment = angular, sharp edges More transport = more rounded, well-rounded o Sorting -- affected by different velociites of wind and water currents naturally separating differnet densities and sizes of sediments from one another Poorly sorted - composed of many different sizes and/or densities of grains mixed together; usually comprised of angular grians Well-sorted - composed of grains that are of similar size and/or density; usually comprised of well-rounded grains o Grain size = Wentworth classes Gravel - grains larger than 2 mm Sand - grains from 1/16 mm to 2 mm; size of grains in sandbox; visible and feel gritty
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ch 5 and 6 - Sedimentary Rocks Chemical weathering...

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