There are three different varieties of Ultraviolet Radiation.

UVC - The most powerful and dangerous form, it is completely absorbed by the ozone layer.

UVB - This form causes tanning and is partially absorbed by the ozone layer. UVB penetration increases toward the equator because the sun shines more directly.

UVA - As the least energetic form, UVA passes through the ozone layer unaffected.

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what is Ozone?

THe Ozone Hole