Red soils are rich in

1. Potash
2. Lime
3. Nitrogen
4. Phosphate

An area in India where Gully erosion takes place

1. Narmada valley
2. Chambal ravines
3. Ganga river
4. Damodar river

The soil with the unique property of being building material

1. Red soil
2. Alluvial soil
3. Laterite soil
4. Black soil

The laterite soils are found in

1. The summits of Western ghats
2. Deccan Plateau
3. Indo-Gangetic plains
4. Coastal plains