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Home > How it Works > why does our skin gets dark when exposed to the sun?

why does our skin gets dark when exposed to the sun?

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soonny | 13:35 Thu 08th May 2003 | How it Works
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why does our skin gets dark when exposed to the sun?
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Avatar Image j2buttonsw
One's skin reacts to damage done by UV light by producing melanin. Browning occurs when UV light oxidises melanin. http://www.acnecontrol.com/teenstuff.htm
13:44 Thu 08th May 2003
Avatar Image xyzzy@bok
but if we had genetic and evolutionary smarts you'd expect equatorial people to be white to reflect the heat and people closer to the poles to be black to absorb the heat, so are we not very adaptive?
17:12 Thu 08th May 2003
Avatar Image Hamish
UV light, which causes tanning is distructive to tissue and cause premature aging of the skin if not protected and carries the risk fo cancer. Infrared light, also from the sun, is the part that carried the heat. This doesn't burn the skin. Think about it this way. Skiers get sun burnt despite being in cold temperatures. This is due to clear skies and UV light reflected of the snow. Hope that helps xyzzy
14:20 Fri 09th May 2003

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