Environment protection

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Across
  1. 4. A material used to make things
  2. 6. Things that make the land, air and water dirty
  3. 8. Pictures or ideas in your mind
  4. 10. Body is strong and well
  5. 11. A try at something
Down
  1. 1. To keep away
  2. 2. Having nothing inside
  3. 3. The places around us
  4. 5. Unfinished food
  5. 7. How hot and cold a thing or a place is
  6. 9. To make less