WORLD HISTORY

Detailed explanation-1: -alluvial deposit, Material deposited by rivers. It consists of silt, sand, clay, and gravel, as well as much organic matter.

Detailed explanation-2: -Flood plains are formed by the deposition of fine soil and other material called sediments on the river banks. As the soil and sediments are brought by flood water, they are very fertile.

Detailed explanation-3: -Alluvium (from Latin alluvius, from alluere ‘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.

Detailed explanation-4: -When the river floods, it deposits layers of fine soil and other material called sediments along the banks of the river. This leads to the formation of a floodplain.