Across
- 2. a bad intrusion by humans
- 4. another word for farming
- 6. when fertile land becomes dry
- 7. a water bottle that can filter pollutants from water
- 10. the supply of water to crops
- 12. the gradual deconstruction of something (like rock)
- 13. all inhabitants in an area
- 14. polluted rain
- 16. when liquid becomes vapor (like water)
- 17. the action of transporting
- 19. fog or haze combined with smoke
Down
- 1. a natural fuel like coal or gas
- 3. number of things an area can support
- 5. the temperature in general for a long period of time
- 8. a biological community
- 9. colorless toxic gas
- 11. water held underground
- 15. to maintain
- 18. waste put in water