Explanation:

- Khadar: It is new alluvial soil deposited by the rivers in their flood plains. It's rich and fertile, renewed annually by floods.

- Bangar: Older alluvial soil found away from river beds. It's less fertile compared to Khadar, with calcareous deposits.

- Bhabar: A coarse soil, deposited at the foothills of the Himalayas. It consists of gravel and coarse sand, deposited by rivers descending from the mountains.

- Regur (Black Soil): Also known as black cotton soil, formed from volcanic rocks. Rich in iron, magnesium, and aluminum, suitable for cotton cultivation.

? Regur is different as it is not formed by river action but from volcanic activity.