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Alluvium

rivers

Alluvium, sand, mud, or other earthly material deposited by rivers and streams, especially in the lower parts of their courses. The deltas of some rivers, for example, the Ganges, the Nile, and the Mississippi, consist of great masses of alluvial deposits. The meadows or plains flanking many rivers have been built up of alluvium and often receive further accumulations during floods.

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