give reason for the The small ozone layer on top of the stratosphere is crucial for human survival.?

The small ozone layer on top of the stratosphere is crucial for human survival because it absorbs harmful ultraviolet radiations present in sunlight and prevents it from reaching the earth's surface.The ultraviolet radiations can cause many types of skin diseases and is harmful to the living cells and plants.The ozone layer also keeps the earth warmth by trapping infra red radiations.