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Class IV. Chapter-14 Keeping Our Earth Green and Clean.
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Pollution. The addition of harmful substances in air , water and soil that cause harm or discomfort to human beings and other living organisms..
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Pollutants. The harmful substances that cause pollution..
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Water Pollution. The addition of harmful substances into water bodies like lakes, rivers and oceans..
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Causes of water Pollution. Washing clothes and utensils in rivers ,lakes etc Addition of soaps detergents and other chemicals Garbage thrown by people Bathing of animals.
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Measures to keep W ater B odies Clean. Don’t Wash clothes and utensils in rivers , lakes etc Don’t throw Garbage into water bodies. Don’t Bath animals in water bodies Waste water from factories and sewage from homes must be treated before letting them flow into waterbodies ..