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- Wastewater Story
NCERT Exemplar Solutions Class 7 Science Solutions for Wastewater Story - Exercise in Chapter 18 - Wastewater Story
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In a filtration plant water is filtered using layers of
Answer:
(d) sand, fine gravel and medium gravel.
Explanation:
During waste water treatment waste water is allowed to enter a grit of sand, fine gravel and medium gravel. Here speed of waste water is slowed down to allow sand, fine gravel and medium gravel to settle down.
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