Across
- 5. Addition of pollutants in air
- 7. Can be decomposed by natural process
- 8. Rain containing weak acids
- 9. Settling down of heavy particles in a container
Down
- 1. Undesirable changes due to different aspects
- 2. Human waste
- 3. Accumulation of pesticides in our body
- 4. Water fit for drinking
- 6. Treatment of water with chlorine