Across
- 6. Surroundings or conditions in which a person, animal, or plant lives or operates.
- 7. Using old items and making them usable again.
- 9. A mixture of ingredients used as plant fertilizer.
- 10. Changing waste materials back into something useful.
- 12. Able to be maintained
- 14. Scientific study of organisms and their environment
- 16. A molecule composed of three oxygen atoms.
- 17. Not around anymore.
- 18. Trash.
- 19. Not depleated up when used.
Down
- 1. Somethng made out of plants.
- 2. Keep something safe from harm.
- 3. Layer of gases that surrounds the planet and is needed for supporting life.
- 4. Designated area where trash is put.
- 5. Contaminate water, air, or a place.
- 6. Substances released into the air.
- 8. A community of living organisms.
- 11. protect the environment, something culturally important, place, or thing from harm.
- 13. Relating to or determined by the sun.
- 15. Natual area around an animal or organism.