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Poll
What brand of blade do you use ?
Butterfly
Sedimentary rock I_vote_lcap41%Sedimentary rock I_vote_rcap
 41% [ 18 ]
Stiga
Sedimentary rock I_vote_lcap18%Sedimentary rock I_vote_rcap
 18% [ 8 ]
DHS
Sedimentary rock I_vote_lcap5%Sedimentary rock I_vote_rcap
 5% [ 2 ]
Donic
Sedimentary rock I_vote_lcap14%Sedimentary rock I_vote_rcap
 14% [ 6 ]
Yasaka
Sedimentary rock I_vote_lcap7%Sedimentary rock I_vote_rcap
 7% [ 3 ]
729 Friendship
Sedimentary rock I_vote_lcap7%Sedimentary rock I_vote_rcap
 7% [ 3 ]
JOOLA
Sedimentary rock I_vote_lcap2%Sedimentary rock I_vote_rcap
 2% [ 1 ]
Killerspin
Sedimentary rock I_vote_lcap2%Sedimentary rock I_vote_rcap
 2% [ 1 ]
Andro
Sedimentary rock I_vote_lcap2%Sedimentary rock I_vote_rcap
 2% [ 1 ]
Xiom
Sedimentary rock I_vote_lcap2%Sedimentary rock I_vote_rcap
 2% [ 1 ]
Total Votes : 44
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kosovohp



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PostSubject: Sedimentary rock   Sedimentary rock I_icon_minitimeFri Dec 31, 2010 4:55 am

Sedimentary rock is a type of rock that is formed by sedimentation of material at the Earth's surface and within bodies of water. Sedimentation is the collective name for processes that cause mineral and/or organic particles (detritus) to settle and accumulate or minerals to precipitate from a solution. Particles that form a sedimentary rock by accumulating are called sediment. Before being deposited, sediment was formed by weathering and erosion in a source area, and then transported to the place of deposition by water, wind, mass movement or glaciers which are called agents of denudation.
The sedimentary rock cover of the continents of the Earth's crust is extensive, but the total contribution of sedimentary rocks is estimated to be only 5% of the total volume of the crust. Sedimentary rocks are only a thin veneer over a crust consisting mainly of igneous and metamorphic rocks.
Sedimentary rocks are deposited in layers as strata, forming a structure called bedding. The study of sedimentary rocks and rock strata provides information about the subsurface that is useful for civil engineering, for example in the construction of roads, houses, tunnels, canals or other constructions. Sedimentary rocks are also important sources of natural resources like coal, fossil fuels, drinking water or ores.
The study of the sequence of sedimentary rock strata is the main source for scientific knowledge about the Earth's history, including palaeogeography, paleoclimatology and the history of life.

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