Environment problems

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Across
  1. 2. made dirty or unsafe by harmful substances
  2. 3. natural homes where animals and plants live
  3. 6. warming the Earth getting hotter over time
  4. 8. gases gases that trap heat around the Earth
  5. 11. light harmful invisible light from the sun
  6. 14. when roads are full of traffic and cars move slowly
  7. 15. a very dry area with little rain and few plants
  8. 17. the layer of air around the Earth
  9. 18. substances made by mixing different materials
Down
  1. 1. land with farms, fields, and nature outside cities
  2. 4. layer a protective layer of gas high in the sky
  3. 5. when water covers land that is usually dry
  4. 7. fumes dirty gases that come out of cars and vehicles
  5. 9. when a type of animal or plant no longer exists
  6. 10. thick dirty air you can see, usually brown or gray
  7. 12. rain rain that contains harmful chemicals
  8. 13. something that makes air, water, or land dirty and unsafe
  9. 16. thick forests with many trees and heavy rainfall
  10. 18. man-made chemicals that damage the ozone layer
  11. 19. at risk of disappearing forever