Sunlight has the property to bleach wood, decompose plastic and lighten your hair because sunlight breaks down the molecular layers that absorbs the light and heat. The skin darkens because the natural tanning that occurs is a safety measure to keep the skin from doing the same, breaking down. People who live in more sunny areas get darker skin than those who live in less sunny environments due to clouds, etc. People who live in hotter climates get more curly hair and a more open nose as a byproduct to reduce heat.

Because there is melanin in our skin and when the sun hits our skin, the melanin absorbs the UV rays and darkens your skin.

Answer:
The answer has to do with melanin, a pigment that gives color to skin and hair. Special cells in the skin, called melanocytes, make two different types of melanin, eumelanin, which has a brown or black color, and pheomelanin, which is yellowish-red. How much of each kind of melanin we make determines the exact shade of our skin and hair color.

Most people have the same number of melanocytes, but some people’s melanocytes make more or less melanin than others. A few people can’t make any melanin and have white skin and hair (albinism).

Why do we even need this coloring? Melanin helps protect our skin and hair by filtering out potentially harmful ultraviolet (UV) radiation from the sun. When people with lighter skin are exposed to the sun, melanocytes make more melanin and the skin gets darker. This is a slow process, however. Skin burns if a person with lighter skin gets too much sun too fast. Red heads are particularly sensitive. People with darker skin (for example, African-Americans) make lots of melanin all the time so tend not to get sunburn or skin cancer.

Things work differently in our hair. UV radiation from the sun makes hair brittle (dry and fragile) and damages the melanin so that it loses its color. Because hair is no longer living, the melanin can’t be replaced.

Answer:
The sun DESTROYED its is very hazardous, so it takes browns the skin by destroying our skin, and it lightens the hair by destroying our hair
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Pigments work that way.
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thats just how pigments work
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