Answer :
The two principal sources of sediment that produce the two principal types of sedimentary rocks are clastic and chemical.
Clastic or detrital sedimentary rocks are made from pieces of bedrock, sediment, derived primarily by mechanical weathering. Clastic rocks may also include chemically weathered sediment.
Sediments are also classified by origin. There are four types: lithogenous, hydrogenous, biogenous, and cosmogenous. Lithogenous sediments come from land via rivers, ice, wind, and other processes. Biogenous sediments come from organisms like plankton when their exoskeletons break down.
Common sedimentary rocks include sandstone, limestone, and shale. These rocks often start as sediments carried in rivers and deposited in lakes and oceans.
Clastic sedimentary rocks, like sandstone, form from clasts, or pieces of other rock. Organic sedimentary rocks, like coal, form from hard, biological materials like plants, shells, and bones that are compressed into rock.
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