Across
- 6. our surroundings
- 7. To change one thing to another
- 9. decomposed plants
- 10. Transforming old products to new products
- 12. something that can be sustained
- 14. the science of the ecosystem
- 16. Layer on the atmosphere
- 17. no longer living
- 18. trash on the ground
- 19. something we can keep making
Down
- 1. natural
- 2. keep in a certain condition
- 3. layers of gas in the air
- 4. where the trash goes
- 5. to contaminate with harmful chemicals
- 6. something cars release into the air
- 8. all life in an area
- 11. to save
- 13. coming from the sun
- 15. a home to an animal