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Ozone layer acts as a shield against the ultra violet rays and protects the life on the earth. Ultra violet rays are emitted by the sun. These rays are intercepted by the ozone layer of the atmosphere before they reach the surface of the earth. Ozone layer absorbs harmful emissions from the sun and protects the life on the earth. Ozone layer is composed of ozone, a molecule made up of three oxygen atoms which are bonded together.
The Ozone Hole For nearly a billion years, ozone molecules in the atmosphere have protected life on Earth from the effects of ultraviolet rays. The ozone layer resides in the stratosphere and surrounds the entire Earth. UV-B radiation (280- to 315- nanometer (nm) wavelength) from the Sun is partially absorbed in this layer. As a result, the amount of UV-B reaching Earth s surface is greatly reduced.