Class 7 Biology Wastewater Story Water our life line

Water our life line

  • Clean water useful for several purposes is not available to all.
  • Clean water is a basic need of human being because clean water is useful for drinking, cooking, bathing, watering the plants and also for keeping ourselves clean.

Fig. Water for drinking, cooking, bathing  

  • 22 March is celebrated as World Water Day.
  • The process of removing pollutants before it enters a water body is called as cleaning of water.
  • The process of cleaning of water is commonly known as Sewage Treatment.

Fig. Sewage Treatment  

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