CBSE - Class 07 - Science - Waste water Story
Waste water Story: Where does dirty water from your house go? Have you seen a drain? Does the water stand in it sometimes? Does this have any harmful effect? - Sewage; need for drainage/sewer systems that are closed.
Online test Waste water Story: Where does dirty water from your house go? Have you seen a drain? Does the water stand in it sometimes? Does this have any harmful effect? - Sewage; need for drainage/sewer systems that are closed.
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Online test Waste water Story: Where does dirty water from your house go? Have you seen a drain? Does the water stand in it sometimes? Does this have any harmful effect? - Sewage; need for drainage/sewer systems that are closed.
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