Across
- 3. kill organisms that could damage crops
- 6. process of concentrating a lot of people in a small area
- 8. geological formation that contains groundwater
- 9. local extinction
- 12. projects that can be undertaken
- 13. when humans change the land to grow crops or factories
- 14. reflectivity of a surface
- 15. food that helps plants grow
- 16. ecological degradation that happens when fertile land becomes dry
Down
- 1. the removal of many trees from an area
- 2. the physical material covering an area
- 4. prevent the wasteful use of resources
- 5. areas that are significantly warmer than the surrounding natural areas
- 7. raising farm animals and growing crops
- 10. rocks that miners are not looking for
- 11. land not near big cities