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Chlorofluorocarbons have been in use for

Chlorofluorocarbons are inorganic compounds that contain only carbon. They are widely used in refrigerators, aerosol propellants and formation of foam.

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17

Which of the following contribute to green house effect?

 18

Who is popularly known as ‘water man’?

 20

Ozone hole was discovered in

 1

(a) Fill in the blanks: A, B, and C

(b) Identify the biogeochemical cycle.