Q17 of 54 Page 350

Name two greenhouse gases? Which one of them produces the maximum greenhouse effect?

The trapping of radiation by the earth’s atmosphere is known as Greenhouse effect. Life would not have been possible without this process. Carbon dioxide and methane are greenhouse gases. Carbon dioxide produces the maximum greenhouse effect.


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Explain the difference between pure air and polluted air.

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What is 'greenhouse effect'? State its importance for us.

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What depletes the ozone layer in the atmosphere? What are the harmful effects of the depletion of ozone layer on us?

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Name one source and one harmful effect of each of the following air pollutants:

(a) Sulphur dioxide


(b) Nitrogen oxides


(c) Carbon monoxide


(d) Chlorofluorocarbons (CFCs)