Question

why is alluvial soil found mostly in the northern plains and black and red soil in the plateaus​

Answer 1

Explanation:

Alluvial soil

Alluvial soil covers the Northern Plains of India

Answer 2

These soils are formed by the sediments brought down by rivers. The rivers deposit very fine particles of soil called alluvium in their plains during the course of their long journey. These soils occupy 40 percent of the land area.