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Across
  1. 4. things that make something impure
  2. 5. no contaminants in a substance
  3. 8. polluting substance
  4. 10. affects the universe
  5. 11. taken apart from each other
  6. 13. emits radiation
  7. 14. sewer water
  8. 15. water at 100°C is _______
Down
  1. 1. radioactive + 92 on periodic table
  2. 2. parts of something
  3. 3. a mechanical mixture
  4. 6. hole in water bottle
  5. 7. the process of taking out something
  6. 9. kills rodents, insects and weeds
  7. 12. containing salt