Vocabulary

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Across
  1. 2. Advantages
  2. 3. The possibility of something bad happening
  3. 4. to make air or water dirty oe harmful
  4. 6. Someone who disagrees with an idea
  5. 7. Inexpesnive
Down
  1. 1. Terrible accidents which cause a lot of damage
  2. 5. Continuing for a long time