Protecting the environment

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Across
  1. 2. air pollution that reduces visibility
  2. 4. term for non-renewable energy sources such as coal
  3. 7. the process of collecting and processing materials
  4. 8. anything that surrounds us
  5. 9. form of precipitation with acidic components, such as sulfuric or nitric acid
  6. 10. to make dirty and not safe or suitable to use
Down
  1. 1. the act of protecting Earth's natural resources
  2. 3. the ability of things to get disintegrated (decomposed) by the action of micro-organisms
  3. 5. energy that does not come from fossil fuels
  4. 6. an odorless, colorless gas made up of three oxygen molecules