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.
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