Across
- 6. The surroundings, or conditions of a place.
- 7. The cycle of converting waste into objects.
- 9. Decayed material that can be used as a fertilizer.
- 10. To reuse unwanted objects to make another object of higher value.
- 12. Something able to be maintained.
- 14. A branch of biology.
- 16. A colorless unstable toxic gas.
- 17. Something that no longer exists.
- 18. Waste in area it is not supposed to be.
- 19. An unlimited source.
Down
- 1. Something made out of living things.
- 2. To conserve.
- 3. Layers of gases surrounding the Earth, or other planets.
- 4. A place where waste is buried to decompose.
- 5. Waste that contaminates a place.
- 6. The product and discharge of something.
- 8. Area of space with abiotic and biotic factors.
- 11. To preserve something.
- 13. Anything pertaining to the sun.
- 15. An environment for living creatures.