science

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