Quiz:

1. List down air composition and its percentage.

2. What is meant by air pollution?

3. Give 4 examples of air pollutant.

4. State 3 effects of air pollution on human health.

5. State 3 effects of air pollution on environment.

6. State 2 main sources of water pollution.

7. State 3 effects of water pollution on living things.

8. State 3 ways in controlling water pollution.