Environmental issues

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Across
  1. 2. Animals that may become extinct are ________
  2. 5. A person or thing that is regarded as dangerous
  3. 6. In many big cities, there is a lot of air ________
  4. 8. A slippery area, esp a patch of oil floating on water
  5. 10. The greenhouse effect is the main cause of __________ ________
  6. 12. A chemical used for killing insects
  7. 14. Carbon dioxide is an example of a ___________
  8. 15. A jungle where there is a lot of rainfall
  9. 18. Garbage, rubbish, or trash
  10. 19. The place where an animal lives is called its _________
Down
  1. 1. Trees breathe in carbon dioxide and breathe out ______
  2. 2. The external surroundings in which a plant or animal lives
  3. 3. Gases ejected from an engine as waste products
  4. 4. A mixture of smoke and fog
  5. 7. Reuse material to make a new priduct
  6. 9. There are too many ________ on the roads
  7. 11. There is a hole in the _________ _________
  8. 13. A place or area where waste materials are dumped
  9. 16. The descent of solid material in the atmosphere onto the earth, esp of radioactive material following a nuclear explosion
  10. 17. Waste matter from domestic or industrial establishments