Explanation:

40%

Mostly available soil in India (about 43%) which covers an area of 143 sq.km.Widespread in northern plains and river valleys.In peninsular-India, they are mostly found in deltas and estuaries.Humus, lime and organic matters are present.Highly fertile.Indus-Ganga-Brahmaputhra plain, Narmada-Tapi plain etc are examples.
They are depositional soil – transported and deposited by rivers, streams etc.Sand content decreases from west to east of the country.New alluvium is termed as Khadar and old alluvium is termed as Bhangar.Colour: Light Grey to Ash Grey.Texture: Sandy to silty loam or clay.