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- Dictionaryalluvium/əˈl(j)uːvɪəm/
noun
- 1. a deposit of clay, silt, and sand left by flowing floodwater in a river valley or delta, typically producing fertile soil.
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noun
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Alluvium (from, from 'to wash against') is loose clay, silt, sand, or gravel that has been deposited by running water in a stream bed, on a floodplain, in an alluvial fan or beach, or in similar settings. Alluvium is also sometimes called alluvial deposit. Alluvium is typically geologically young and is not consolidated into solid rock. Sediments deposited underwater, in seas, estuaries, lakes, or... Wikipedia