14. Environment & Pollution

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Across
  1. 4. a change or result that is caused by something
  2. 5. to keep someone or something safe from something dangerous or bad
  3. 7. dioxide a gas formed when people or animals breathe out, or when carbon is burned
  4. 10. the natural surroundings of living things, such as the air, land, or sea
  5. 11. to set someone or something free
  6. 12. injury, damage, or problems caused by something that you do
  7. 13. someone or something that makes something happen
  8. 17. to make something less
  9. 18. an amount of liquid that has accidentally flowed out of a container
  10. 19. a place where waste is buried in the ground
  11. 20. a gas in the air that has no smell or taste, and that all animals depend on to breathe
  12. 21. very sour; containing acid or consisting of an acid
  13. 23. to get rid of something; to deal with and finish something
  14. 24. to use something completely
  15. 25. to put something somewhere to get rid of it
  16. 26. to make water, air, soil, etc dirty or harmful
  17. 29. to use paper, glass, plastic, etc again and not throw it away
Down
  1. 1. to keep something from happening
  2. 2. a large area of trees growing closely together
  3. 3. to cause a change in someone or something
  4. 6. a poisonous form of oxygen that exists high in the Earth's atmosphere
  5. 8. smelling clean or feeling pleasantly cool; clearly new and different
  6. 9. to cause someone or something to be in a dangerous situation
  7. 14. one of two or more things that you can choose between
  8. 15. animals, birds, and plants living in their natural environment
  9. 16. a building made of glass for growing plants in
  10. 22. a substance that is used to provide heat or power
  11. 23. to harm or break something
  12. 27. things that you throw away because you do not want them
  13. 28. to prevent something from being damaged or destroyed