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    Biology
    Grade-7
    Easy

    Question

    Water is allowed to stand in huge tanks so that suspended impurities settle down. This process is called ___________. (Analyze)

    1. Aeration
    2. Distillation
    3. Sedimentation
    4. Filtration

    hintHint:

    The process is based on the effect of gravity.

    The correct answer is: Sedimentation

      • Sedimentation is a part of waste water treatment process
      • During the process, the waste water is allowed to stand still for certain period of time so that the solids get deposited at the bottom of the tank
      • Sedimentation occurs due to effect of gravity
      • The deposited solids are called sediments

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