Environment

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Across
  1. 4. to make bad by mixing with dirty matter
  2. 6. American for petrol
  3. 8. of a kind likely to be damaging
  4. 9. things thrown away, esp. paper scattered untidily
  5. 11. conditions of wind, rain, sunshine, snow,etc. at a certain time
Down
  1. 1. to adapt to a new use
  2. 2. type of matter
  3. 3. average weather conditions at a particular place
  4. 5. discarded or useless material
  5. 7. waste material to be thrown away
  6. 10. the movement through an area or along a route