Q20 of 287 Page 350

Ozone hole was discovered in

Ozone hole was discovered in 1985 over Antarctic by Joe Farman, Brian Gardiner and Jonathan Shanklin.

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18

Who is popularly known as ‘water man’?

 19

Chlorofluorocarbons have been in use for

 1

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

(b) Identify the biogeochemical cycle.


 2

(a) Identify the biogeochemical cycle.

(b) Fill in the blanks: A, B, C and D.

(c) What will happen if the step E does not occur.