Black Soil - These types of soil are rich in iron, magnesium, aluminium, and lime. The soil gets its black colour from various salts during salt formation. Black soil contains a large amount of clay in them and is sandy in hilly regions. These soils are formed due to the weathering of the lava rocks.Laterite Soil - Laterite soils are very rich in iron but poor in organic matter. These soils are acidic in nature and are not very fertile. This soil is also used to make bricks due to the presence of a high amount of iron.