Acid Rain

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Across
  1. 3. measure of how acidic water is
  2. 4. Environmental Protection Agency
  3. 5. become progressively worse
  4. 6. invention and application of machinery
  5. 7. a natural gas like coal, gas and oil
  6. 9. possesses elevated levels of hydrogen ions
  7. 11. federal law that regulates air emissions
  8. 13. harmful substances or products
  9. 14. height above a given level
Down
  1. 1. chemical element with symbol N
  2. 2. removal from an office or position
  3. 3. a casting down or falling headlong
  4. 8. a chemical element with symbol S
  5. 10. a community of living organisms
  6. 12. harm caused to something