Land, Water, and Air Resources

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Across
  1. 5. the advance of desert-like conditions into areas that previously were fertile
  2. 8. human-made gases containing chlorine and fluorine
  3. 10. the layer of soil below topsoil that has less plant and animal matter than topsoil
  4. 15. the process by which water, wind, or ice moves particles of rock or soil
  5. 17. the layer of dead leaves and grass on top of the soil
  6. 19. particles of rock and sand
  7. 20. waste produced in homes, business, and schools
  8. 21. the theory that increasing carbon dioxide in the atmosphere will raise Earth's average temperature
  9. 25. pollutants that are released into the air
  10. 27. a substance that provides nutrients to help crops grow better
  11. 29. a period of less rain than normal
  12. 31. a substance that causes pollution
  13. 33. a condition in which a layer of warm air traps polluted air close to Earth's surfaced
  14. 34. the layer of the atmosphere that contains a higher concentration of ozone than the rest of the atmosphere
Down
  1. 1. smog a thick, brownish haze formed when certain gases react with sunlight
  2. 2. the burning of solid waste
  3. 3. rock that makes up Earth's crust
  4. 4. waste a material that can be harmful if it is not properly disposed of
  5. 6. the water and human wastes that are washed down sinks, toilets, and showers
  6. 7. the situation that arises when more oil nutrients are used than the decomposers can supply
  7. 9. the process of helping biodegradable wastes to decompose naturally
  8. 11. a chemical that kills crop-destroying organisms
  9. 12. the construction of buildings, roads, bridges, dams, and other structures
  10. 13. capable of being broken down by bacteria and other decomposers
  11. 14. a toxic form of oxygen
  12. 16. a colorless, odorless, radioactive gas
  13. 18. polluted liquid produced by water passing through buried wastes in a landfill
  14. 22. precipitation that is more acidic than normal because of air pollution
  15. 23. water stored in underground layers of soil and rock
  16. 24. the process f reclaiming and reusing raw materials
  17. 26. a landfill that holds nonhazardous waste such as municipal solid waste and construction debris
  18. 28. an upper layer of soil consisting of rock fragments, nutrients, water, air, and decaying plant and animal matter
  19. 30. the trapping of heat near Earth's surface by certain gases in the atmosphere
  20. 32. the process of restoring land to a more natural state