Ozone is a molecule made of three oxygen atom or O3. When
ultraviolet light in the range 240 and 320 nm strikes an ozone molecule, it absorbs the
energy and the O3 changes to O2 and O. The O atom soon combines with another O2 molecule
to form O3 and is ready to absorb ultra violet light.
The
ozone layer is situated at the highest level of our atmosphere and by absorbing the
harmful ultra violet radiation from the Sun, serves a very important purpose.
Chlorofluorocarbons or CFCs damage the ozone layer by not allowing O3 to form again once
it has split to O and O2 molecules.
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