Across
- 6. the surroundings or conditions in which a person or thing lives in
- 7. convert to reuseable material
- 9. decay of organic material used as a plant fertilizer
- 10. reuse in a way to make it higher quality
- 12. able to be maintained
- 14. the study of organisms
- 16. a colorless gas made up of 3 oxygen molecules
- 17. no longer alive
- 18. trash on the ground
- 19. a resource that is replenished naturally
Down
- 1. things that are natural or related to nature
- 2. keep longer
- 3. the gases surrounding the Earth
- 4. where garbage goes
- 5. contaminate
- 6. the production and discharge of gas or radiation
- 8. a biological community of organisms and environment
- 11. protect
- 13. sun rays as a source of energy
- 15. where animals live