Answer the following in brief:
During a field visit to a hilly region, a student found that some rocks had broken into smaller fragments, whereas others had developed a reddish coating. Using these observations, explain how weathering includes different kinds of changes.
The two observations show that .
The is a because . However, the is a because when rocks containing iron react with water or moist air. Thus, weathering includes both physical and chemical changes that gradually help in the formation of soil.