environment and waste

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Across
  1. 2. preserve
  2. 5. harmful substance
  3. 8. -to fill an area with growing plants in order to make it more attractive
  4. 10. damaging precipitation
Down
  1. 1. - waste matter in drains
  2. 3. a poisonous blue gas that is a type of oxygen
  3. 4. a general increase in world temperatures caused by increased amounts of carbon dioxide around the Earth
  4. 6. waste for reuse
  5. 7. study of environments
  6. 9. natural home