Across
- 4. caused by the contamination of soil
- 6. used in greenhouses to keep plants warm
- 10. caused by speakers
- 13. caused by contamination of air
Down
- 1. formed by earth's crust
- 2. formed by water
- 3. present as a blanket around earth
- 5. caused by contamination of water
- 7. the life supporting zone of earth
- 8. when impure causes jaundice, cholera, etc
- 9. process of digging out minerals from inside earth
- 11. can be used for activities like mining, farming, etc
- 12. everything respirates it to remain alive