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Ultraviolet
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Exposure to
ultraviolet radiation can cause suntan, sunburn and skin cancer..
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Darker skins reduce
cancer risk because they absorb more ultraviolet radiation but
let less of
it reach the underlying body
tissues..
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Sun block can
reduce damage caused by ultraviolet.
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High factors of sun
block reduce risks caused by ultraviolet..
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High factors of sun
block allow longer exposure to ultraviolet without burning.
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The longest time a person
can safely stay in the Sun when using a sunscreen is given
by the
following formula:
Minimum
time (hours) in the Sun without burning without sunscreen
x Sun protection factor number
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The ozone
layer is located in the upper atmosphere. It absorbs
ultraviolet radiation and
protects living organisms, especially animals from the harmful
effects of ultraviolet radiation.
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Environmental
pollution from CFCs is depleting the ozone layer.
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