Water Unit Review Puzzle

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Across
  1. 3. there are two of these atoms in a water molecule
  2. 4. word to describe a group of contaminants like salt, fertilizers, pesticides, and metals
  3. 5. word to describe a group of contaminants like E. coli, salmonella, or parasites
  4. 6. liquid into gas
  5. 9. area of land that drains to a common body of water
  6. 11. the amount of particles in an object
  7. 15. sticky clumps formed from the reaction of alum with sand and other waste in water treatment
  8. 16. where most of Ottawa gets its drinking water
  9. 17. added to water in the first step of treatment
  10. 19. water that has been used for cooking, laundry, or bathing
  11. 20. the change of state when a liquid loses heat energy
  12. 21. the change of state when water vapour cools in the sky into clouds and rain
Down
  1. 1. the 3 dimensional size of an object
  2. 2. the force pulling an object to Earth that depends on gravity (mass x gravity)
  3. 4. added to water as a disinfectant to kill bacteria
  4. 5. water that contains human waste, sewage
  5. 7. how closely packed particles are
  6. 8. word for H2O in gaseous state
  7. 10. solid directly into gas
  8. 12. required to evaporate
  9. 13. an undesirable substance in a mixture
  10. 14. the least dense state of matter that has particles moving fastest with the most energy
  11. 18. least dense state of H2O