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ANSWERS |
| 1. The Ozone Layer |
2. The Control of Pollution Act |
3. Sulphur Dioxide |
4. Biodegradable |
| 5. Benzene |
6. Alternative Energy |
7. Catalytic Converters |
8. Biological Control |
| 9. Nitrate |
10. Extinction |
11. Aurora Borealis |
12. Lose a Day |
| 13. Prairie |
14. Pacific |
15. Crust |
16. Skeletons of Tiny Creatures |
| 17. The Atmosphere |
18. A Type of Grass |
19. Rice |
20. 24 hours |
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