Assertion (A): Laterite soils are rich in alumina and iron oxide, but are infertile.

Reason (R): Soluble plant food like potash are leached into the soil.

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R does not explain A.
3. A is true but R is false.
4. A is false but R is true.

Which of the following is correct about the Laterite soil?

1. It is the residual soil.
2. It is formed by leaching due to tropical rains.
3. Humus content of the soil is removed by bacteria.
4. All of the above.

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

State any two factors responsible for the formation of soil.