Across
- 3. chemical element with an atomic number of 16
- 4. a substance that is harmful to the environment(pollute)
- 6. fuel such as gas formed from remains of living organisms
- 8. gradual destruction of something
- 10. farming; raising crops and livestock
- 11. capable of producing vegetation
- 14. number of people in the world in billions
- 17. fog/ haze combined with atmospheric pollutants
- 18. water that has seeped down under the ground
- 19. making steps in flat areas
- 20. artificial of water to help produce crops
Down
- 1. an area of land without vegetation and soil is reduced to dust
- 2. introducing harmful substances to the environment
- 5. chemical substance put on plants to protect them from pests
- 7. something that flows off into bodies of water
- 9. number of people that can be supported by something
- 12. number of people the earth can support in billions
- 13. number of people in an area
- 15. process of turning liquid to vapor
- 16. manage, preserve, or save