4. WEATHERING.

WEATHERING;is the process of soil formation involves the break down of rocks into small particles or fragments.

There are three forms of weathering;

1) Mechanical or physical weathering.

2) Chemical weathering.

3) Biological weathering.

1) MECHANICAL OR PHYSICAL WEATHERING.

This is integration of rocks into small particles due to mechanical or physical forces exerted on the rocks by various agents . examples of this agents are ; temperature,wind and rainfall.

2) CHEMICAL WEATHERING

It changes the chemical structure of the rock making it unstable and making it to disintegrate .The forms of weathering they cause are hydration , solution, oxidation and carbonation.

3) BIOLOGICAL WEATHERING.

This is caused by animals, plants,man through his numerous activities such as cultivation, mining causes rocks to disintegrate.