Across
- 1. main source of pollution
- 3. air pollution is defined as
- 6. a combination of smoke and fog
- 7. breathing air out
- 8. body defences against inhaled contaminants
- 10. type of gas produced in landfills
- 12. lawnmowers are a form of pollution
- 13. a pollutant that forms just above the earth's surface
- 15. breaking down food in our body
- 18. essential for life itself
- 19. a chronic lung condition
- 20. rethinking before you buy
Down
- 2. fourth layer of atmosphere
- 4. breathing air in
- 5. a substance that causes undesirable changes
- 9. category of waste
- 11. process of organic wastes with worms
- 14. first layer of atmosphere
- 16. first line of defense against the outside world
- 17. co2 is what type of gas