Mention ways of controlling depletion of ozone layer.

Depletion of Ozone is due to

International Day for preservation of ozone layer ______.

Excessive release of ……………… and ………… have direct impact on depletion of ozone layer.

On the basis of chemical reactions involved, explain how do CFC's cause depletion of ozone layer in stratosphere ?

Mention any 3 uses of ozone.