The soil transported by the rivers from the mountains and deposited in the plains is called ______.
Soils are created by the sediments that rivers carry down. In the course of their long journey, the rivers inject very fine particles of soil called alluvium onto their plains. It is a mixture, called loam, of sand , clay and silt. Three major river systems, the Indus, the Ganga, and the Brahmaputra, have deposited them. 40 percent of the land area is covered by these soils.
The correct answer is D .