Unit 8 crossword

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Across
  1. 1. Deposition A more accurate term than acid rain because acidic precipitation can be wet or dry.
  2. 5. A radioactive gas that can accumulate in homes.
  3. 7. Water that has been used and contaminated.
  4. 8. Disease A type of illness that can spread from person to person.
  5. 9. An agent that can cause developmental abnormalities in a fetus.
  6. 11. Hole A region of depleted ozone in the stratosphere.
  7. 14. The build-up of substances, like pesticides, in an organism.
  8. 15. Increase in concentration of a substance in a food chain.
  9. 19. The process by which water-soluble salts accumulate in the soil.
  10. 20. A substance that can lead to cancer.
  11. 21. The spread of urban areas into low-density and typically car-dependent communities.
  12. 22. Agriculture Farming in sustainable ways meeting society’s present food and textile needs.
  13. 23. Fog or haze combined with smoke and other atmospheric pollutants.
  14. 25. The process of making an area more urban.
Down
  1. 2. Chlorofluorocarbons, chemicals found to harm the ozone layer.
  2. 3. The process by which fertile land becomes desert.
  3. 4. Artificial application of water to land to assist in the production of crops.
  4. 6. A bacterium, virus, or other microorganism that can cause disease.
  5. 10. Chemicals used to kill pests, often used in farming.
  6. 12. Island Urban area significantly warmer than its surrounding rural areas due to human activities.
  7. 13. A fibrous mineral once common in building materials, now known for its health risks.
  8. 16. Agriculture A farming system that uses ecologically based pest controls and biological fertilizers.
  9. 17. A poison that acts on the nervous system.
  10. 18. Basic physical and organizational structures needed for the operation of a society.
  11. 24. Protocol An international treaty designed to protect the ozone layer.