(a) Expand CFC.
(b) How does it reduce ozone to oxygen ?

Ozone is obtained from oxygen

(a) Why is the ozone layer required in the stratosphere ? How does it get degraded ? Explain. (b) Why is the ozone depletion a threat to mankind?

Oxygen is reduced to water in

(a) What are the after effects of the degradation of ozone ? (b) How does it affect human health ?

Which of the following free radicals is responsible for causing break down of ozone into oxygen due to use of CFCs ?