Briefly explain depletion of ozone layer and its effects.

Ozone depletion is caused by certain chemicals called ozone depleting substances. They include chlorofluoro carbons, methyl bromide, nitrogen oxides and chlorine. Effects of ozone depletion:

(i) Skin cancer.

(ii) Damage of eyes.

(iii) Damage of immune system.

(iv) Decreased crop yields.