Sedimentary rocks are formed from the decomposition of other types of rocks (for example, volcanic) or from the fossilized remains of parts of animals and plants. At the same time, particles of rocks and organic matter change their structure, and sometimes their chemical composition, under the influence of water and other external factors. Useful sedimentary rocks are located in the surface layers of the earth’s crust. Useful rocks of this type include salt, travertine (formed from volcanic rocks), coal, oil, gypsum, limestone (created from organic particles).
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