Question

how CFCs cause the depletion of ozone ?​

Answer 1

CFC's decompose ozone and make it oxygen. In this way it causes the depletion of ozone.

Answer 2

CFCsrise into the stratosphere where they are eventually broken down by ultraviolet (UV) rays from the Sun. This causes them to release free chlorine. The chlorine reacts with oxygen which leads to the chemical process of destroying ozone layer...

Hope it helps...