Water Resources

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Across
  1. 4. ensures wastage is kept to a minimum
  2. 5. when countries do not have enough clean water
  3. 8. an arrangement between two or more countries regarding the supply of water resources
  4. 10. process of filtering water
  5. 13. the end product after water is recycled
  6. 17. process of destroying germs
  7. 20. knowledge that people use to meet their needs
Down
  1. 1. process of forcing water through a special membrane to remove bacteria
  2. 2. the quality or state of being impure
  3. 3. the process of removing salt from sea water
  4. 6. a natural place where water is stored
  5. 7. the problem of water shortage
  6. 9. the state or quality of being efficient
  7. 11. the production of crops, livestock, or poultry
  8. 12. weak or unfavourable position
  9. 14. a partially permeable subtance
  10. 15. the introduction of harmful substances or products into the water
  11. 16. an area which rain falls is collected
  12. 18. to preserve
  13. 19. to ask for with proper authority