Across
- 3. / mixture of various decaying organic substances
- 7. / to keep something in its original state
- 10. / made without chemicals
- 11. / the surroundings or conditions in which a person,animal or plant lives
- 14. / a place to dispose of garbage and other waste material
- 15. / things like air,water and soil together
- 17. / contamination of water and air with harmful substances
- 19. / sun energy
- 20. / to process used goods or waste so as to produce something that is often better
Down
- 1. / a layer in the Earth's atmosphere
- 2. / layer of gases surrounding a planet
- 4. / capable of being supported
- 5. / to make something new out of used object
- 6. / doesn't exist anymore
- 8. / restored or replaced by natural process
- 9. / the natural home or environment of an animal,plant or organism
- 12. / a substance discharged into the air
- 13. / trash on the ground
- 16. / to protect something
- 18. / deals with the relations of organisms to one another