In the "Wastewater Story" chapter, CBSE Class 7 students explore the comprehensive path that water takes once it is used and becomes wastewater. The chapter begins by defining wastewater and…
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Environmental Pollution: Air Pollution: Caused by the combustion of coal, petrol, and diesel, industrial processes, solid waste disposal, and sewage disposal. Pollutants include oxides of sulfur, nitrogen, carbon monoxide, hydrocarbons,…
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