അന്തരീക്ഷ മലിനീകരണം (Air Pollution) - Social Science Class 7 Unit 7
The activities which change the natural composition of air are the causes of air pollution. Main Causes of air pollution are # The smoke and...
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Atmosphere (അന്തരീക്ഷം) - Social Science Class 7 Unit 7
Atmosphere is a layer of air which protects the Earth like a blanket.It is essential for the existence of life on the Earth.It contains gase...
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