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Sedimentary rocks are made by cementation and compaction. Usually this happens in the bottom of a lake, pond, etc.
Sedimentary rocks are made up of animal remains, old shells, overall anything that the "cement" can cling onto. this whole process can take millions of years!
To the person that flagged this question, the guy above isn't lying, he just forgot to say that pressure and heat from within the earth combines sediment to create layers of sedimentary rock.
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∙ 12y ago
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