Give a geographical reason for each of the following:

(i) Deltaic alluvium is more fertile than the coastal alluvium.

(ii) Black soil is largely found in the Deccan Trap region.

(iii) Black soil is often referred to as Cotton soil or Regur soil.

(i) Deltaic alluvium is more fertile than coastal alluvium as new layers are deposited year after year during monsoonal floods. Also, deltaic alluvium is composed of fine silt and clay whereas coastal alluvium is full of lime nodules.

(ii) Black soil is found in the Deccan trap region because this region is formed due to the deposition of lava produced by the volcanic eruption. When lava rocks breaks down into finer particles due to weathering, it results in the formation of the black soil.

(iii) Black soil is often referred to as Cotton soil or Regur soil because it is black in colour and is suitable for cotton cultivation.