What is the feel and consistency of soil called?

1. Soil profile
2. Soil texture
3. Soil fertility
4. Soil arability

What is the soil? Name the four types of soil.

Give a geographical reason for each of the following:

(i) The colour of alluvium varies in different areas.

(ii) Khadar is more fertile than bhangar soil.

(iii) Black soil has a kind of self-ploughing characteristic.

(i) How can you say that soil has evolved over millions of years?

(ii) Name one important constituent of soil that adds fertility to the soil.