Lesson 16 The Growing Danger of Air Pollution

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Across
  1. 1. a very small piece of something
  2. 4. not rare
  3. 5. a combination of two or more things
  4. 7. a material that a physical object is made of
  5. 9. to make
  6. 11. not safe
  7. 12. a sickness
  8. 13. something that is done for a specific purpose
  9. 15. a serious disease caused by cells that are not acting normal
  10. 16. the red fluid that travels throughout the body to bring oxygen and take away waste
  11. 18. causing death
Down
  1. 2. to put things into groups according to their qualities
  2. 3. the act of looking at things and seeing how they are the same and how they are different
  3. 4. to make something happen
  4. 6. one of two body parts that people use to breathe
  5. 8. very small
  6. 10. something that makes nature dirty
  7. 11. a sickness
  8. 14. not good for the body
  9. 17. how good or bad something is