Formation of Soil

Q.

What are the factors responsible for soil formation?

1. Topography

2. Climate

3. All the above
4. Living organisms

Q.

It is said that soil takes many years to be formed. It is also a complex process. State how many years does it take for the soil to be made? What are the factors responsible for it?

1. It takes a 10, 000 to 20, 000 years for soil to form.

   The chief factors responsible for soil formation are

   Weathering

   Denudation

   Gradual wearing away of rocks.

2. It takes 100 to 10, 000 years for soil to form.

   The chief factors are

   Climate,

   Topography

   Living organisms

   Type of parent material.

Q.

Define soil.

Q. The thickness of soil layer used for terrace farming is

1. 9 cm
2. 9 inch
3. 9 meter
4. 5 inch