Alluvial deposit, Material deposited by rivers. It consists of silt, sand, clay, and gravel, as well as much organic matter. ... They yield very fertile soils, such as those of the deltas of the Mississippi, Nile, Ganges and Brahmaputra, and Huang (Yellow) rivers.
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Alluvial deposit, Material deposited by rivers. It consists of silt, sand, clay, and gravel, as well as much organic matter. ... They yield very fertile soils, such as those of the deltas of the Mississippi, Nile, Ganges and Brahmaputra, and Huang (Yellow) rivers.