Across
- 2. A layer of gas that protects the Earth
- 3. What provides oxygen for us?
- 5. Loose trash
- 10. Who said “Environmental pollution is an incurable disease. It can only be prevented”?
- 11. Where is smoke pollution a major problem?
- 12. What substance takes 800 years to decompose?
Down
- 1. Able to decompose naturally
- 4. The human-induced warming of the Earth
- 6. Cutting down trees
- 7. What stationary supply do trees make?
- 8. To convert into reusable material
- 9. Where does trash go?