2007-01-22 11:44:08 · 4 answers · asked by ♪♫Lynn♫♪ 5 in Science & Mathematics ➔ Earth Sciences & Geology
Clastic: parts of other rocks - sandstone, shale, conglomerate
Chemical: percipitated from water - gyprock, rock salt
Organic: percipitated with the help of organisms - limestone, diatomaceous earth
2007-01-22 12:13:40 · answer #1 · answered by QFL 24-7 6 · 1⤊ 0⤋
Organic Sedimentary Rocks
2016-11-03 09:51:08 · answer #2 · answered by Anonymous · 0⤊ 0⤋
Clastic sedimentary rocks are rocks composed predominantly of broken pieces or 'clasts' of older weathered and eroded rocks. Grain size determines the basic name of a clastic sedimentary rock. Examples include: siltstones; sandstones; conglomerates and breccias.
Chemical sedimentary rocks are formed by chemical precipitation. The stalactites and stalagmites you see in caves form this way, so does the rock salt that table salt comes from. This process begins when water traveling through rock dissolves some of the minerals, carrying them away from their source. Eventually these minerals can be redeposited, or precipitated, when the water evaporates away or when the water becomes over- saturated with minerals. Examples include the evaporite minerals halite and gypsum.
Biogenic sedimentary rocks contain materials generated by living organisms, and include carbonate minerals created by organisms, such as corals, molluscs, and foraminifera, which cover the ocean floor with layers of calcite which can later form limestone. Other examples include stromatolites, the flint nodules found in chalk (which is itself a biogenic sedimentary rock, a form of limestone), and coal (derived from the remains of tropical plants and subjected to pressure).
2007-01-22 12:11:46 · answer #3 · answered by Anonymous · 2⤊ 0⤋
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RE:
Explain how clastic, chemical ,and organic sedimentary rocks form...and give 2 examples of each please ?!?!?
2015-08-18 23:45:07 · answer #4 · answered by Lavon 1 · 0⤊ 0⤋
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2016-03-22 14:16:56 · answer #5 · answered by ? 4 · 0⤊ 0⤋
i dont feel like it
2007-01-22 13:23:49 · answer #6 · answered by Anonymous · 1⤊ 1⤋