Sedimentary Rocks - Sedimentary Rocks By Roger Williams...

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Sedimentary Rocks By Roger Williams Axia College Student SCI 245 Danielle Jannusch
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Sedimentary rocks by definition: “are those formed from the compaction and cementation of fragments of pre-existing rocks called clasts , or plant and animals remains. The exogenic processes of weathering and erosion create the raw materials for sedimentary rocks. Earth material is loosened and moved from higher to lower elevations where it is deposited as transportation agents like water, wind or gravity lose their energy to move sediment. Streams and rivers transport sediment to lakes or oceans, or deposits it on nearby floodplains where it accumulates. On land, clastic sediments consist mainly of large boulders, cobbles, gravel, sand, and silt. On the continental shelves at the margin of continents, marine sediment is largely sand, silt, and clay. At the outer shelves and on the ocean floor, clays and chemically precipitated calcium carbonate and the remains of tiny marine animals accumulate.”(M. Ritter 2006) Sedimentary rocks are formed through a group of processes known as lithification, where the sediment goes through a several changes those of which are, compaction, recrystalization, and cementation. Compaction is the reducing of pore spaces as a result of increased pressure,
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Sedimentary Rocks - Sedimentary Rocks By Roger Williams...

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