Air Pollution and Conserving Land Crossword

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Across
  1. 2. Contains rock fragments, water, air, and less animal and plant matter
  2. 3. A layer of the upper atmosphere
  3. 5. Process by which people cut down woodlands to harvest timber and to clear the land for farms or ranches
  4. 10. Top layer of soil
  5. 11. Synonym for pollutants
  6. 14. A layer of warm air prevents the rising air from escaping
  7. 16. Advance of desert-like conditions into areas that were previously fertile
  8. 17. Human made gases that contain chlorine and fluorine
  9. 18. Process by which water, wind, and ice particles moves particles of rocks or soil
  10. 19. Includes nutrients that help crops grow better
  11. 20. Precipitation that is more acidic than normal due to air pollution
Down
  1. 1. Process in which large areas of land are developed as more people move into cities and suburbs
  2. 4. Process of restoring an area of land to a more productive state
  3. 5. Period of time when there is less rain fall than normal
  4. 6. A situation when the soil becomes less fertile
  5. 7. Mixture of rock fragments, nutrients, water, air, and decaying animal and plant matter
  6. 8. Occurs naturally in nature
  7. 9. Rock that makes up Earth's crust
  8. 12. A form on oxygen that has three oxygen atoms instead of two atoms
  9. 13. Colorless, odorless gas that is radioactive
  10. 15. Happens when certain gases in the air react to sunlight