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  • Water is very essential for all living things
  • Water is used for drinking , washing , in agriculture &industry
  • Water in the rivers and lakes and oceans is hard as it contains dissolved impurities .It will not lather easily with soap.
  • Purification process done for making water fit for human consumption
  • Water cycle as a natural process of replenishing water lost by evaporation
  • Water conservation is vital for human progress.

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