unit four.ppt - SedimentaryRocks ,such

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Sedimentary Rocks Produced from  weathering products  of pre-existing rocks or  accumulated  biological matter   Detrital  rocks produced from rock fragments Chemical  rocks produced by precipitation of dissolved ions in water Organic  rocks produced by accumulation of biological debris, such  as in swamps or bogs Sedimentary rock types and  sedimentary structures  within the rocks  give clues to  past environments   Fossils  in sedimentary rocks give clues to the history of life Important  resources  (coal, oil) are found in sedimentary rocks
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Relationship to Earth’s Systems Atmosphere   Most sediments produced by weathering in air Sand and dust transported by wind Hydrosphere   Water is a primary agent in sediment production, transportation,  deposition, cementation, and formation of sedimentary rocks Biosphere Biological activity key to formation of sedimentary rocks Petroleum and coal resources have biological origin
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Sediment Sediment  -  loose, solid particles originating from:   Weathering and erosion of pre-existing rocks Chemical precipitation from solution, including secretion by  organisms in water Classified by  particle size  Boulder - >256 mm Cobble - 64 to 256 mm Pebble - 2 to 64 mm Sand - 1/16 to 2 mm Silt - 1/256 to 1/16 mm Clay - <1/256 mm Gravel
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From Sediment to  Sedimentary Rock Transportation   Movement of sediment away from its source, typically by  water, wind, or ice Rounding  of particles occurs due to abrasion during transport Sorting
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