Coal Waste Puzzle

12345678
Across
  1. 3. the surroundings or conditions in which a person, animal, or plant lives or operates.
  2. 4. Sick respiratory system
  3. 7. poisonous or dangerous
  4. 8. use less of something
Down
  1. 1. Utilize ash
  2. 2. The remains of burnt coal
  3. 5. use something again
  4. 6. generate something