Water Resources

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Across
  1. 7. produced when impurities are removed from the waste water
  2. 11. when there is insufficient supply of water for people
  3. 12. this makes up 1% of the freshwater
  4. 13. the method used in Singapore to increase the supply of fresh water
  5. 16. occurs when there is a shortage of water
  6. 20. the process of converting sea water into fresh water
Down
  1. 1. makes up about 97% of the water supply
  2. 2. much of the world's water supply is used in_______and in agriculture
  3. 3. the process of forcing water through a special membrane to remove small particles from water
  4. 4. this is produced in reverse osmosis
  5. 5. we have been buying water from this country since the 1920s
  6. 6. the careful use of resources to ensure that wastage is kept to a minimum
  7. 8. it is important for life on Earth
  8. 9. an arrangement between two counties for supply and use of water resources for a certain period of time
  9. 10. this means 'can ran out one day'
  10. 14. the process of filtering water to remove larger particles and bacteria from the water
  11. 15. the process of water filtration used in desalination
  12. 17. an area over which the rain falls and is collected
  13. 18. these campaigns have been carried out to show the importance of water
  14. 19. the knowledge and tools that people use to meet their needs