Sedimentary Rocks

Jun 28th, 2015
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Sedimentary Rocks are a product of the surface processes of the earth (weathering, erosion, rain, streamflow, wind, wave action, ocean circulation). The starting material for sedimentary rocks are the rocks outcropping on the continents. Processes of physical and chemical weathering break down these source materials into the following components:

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Sedimentary rockMiddleTriassicmarginal marine sequence of siltstones (below) and limestones (above), Virgin Formation, southwesternUtah, USASedimentary rocks on Mars, investigated by NASA'sCuriosity Mars roverSedimentary rocksare types ofrockthat are formed by thedepositionof material at theEarth's surface and within bodies of water.Sedimentationis the collective name for processes that causemineraland/ororganicparticles (detritus) to settle and accumulate or minerals toprecipitatefrom asolution. Particles that form a sedimentary rock by accumulating are calledsediment. Before being deposited, sediment was formed byweatheringanderosionin a source area, and then transported to the place of deposition bywater,wind,ice,mass movementorglacierswhich are called agents ofdenudation.The sedimentary rock cover of the continents of theEarth's crustis extensive, but the total contribution of sedimentary rocks is estimated to be only 8% of the total volume of the crust.[1]Sedimentary rocks are only a thin veneer over a crust consisting mainly ofigneousandmetamorphic rocks. Sedimentary rocks are deposited in layers asstrata, forming a structure calledbedding. The study of sedimentary rocks and rock strata provides information about the subsurface that is useful forcivil engineering, for example in the construction ofroads,houses,tunnels,canalsor other constructions. Sedimentary rocks are also import

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