Margaret Gillespie Sedimentary Rocks (Lab 4) 1. Describe the differences in the formation of biochemical sedimentary rocks, chemical sedimentary rocks, and clastic sedimentary rocks? Biochemical sedimentary rocks are formed from the accumulation of parts or organisms which extract material from their nearby surroundings in order to produce shells, skeletons, wood and living tissues. Often the material extracted is available in solution from the chemical weathering of rocks. When the organisms die, the hard parts are taken and deposited as sediment, sometimes. Other times the sedimentary rock froms right where the organism was formed. Chemical sedimentary rocks are formed by chemical precipitation of compounds out of a water solution like seawater. The substances in the solution are the result of chemical weathering of rocks. Some have interlocking crystals with boundaries that fit together without space between the grains. Clastic sedimentary rocks are formed when mechanical weathering breaks down certain rocks
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Sedimentary rocks, clastic sedimentary rocks, Margaret Gillespie Sedimentary Rocks