DR JEREMY BURGESS / SCIENCE PHOTO LIBRARY DR JEREMY BURGESS / SCIENCE PHOTO LIBRARY
A party of school children playing in temperatures of around 32 degrees centigrade on the beach at Glenelg Adelaide, Australia. Note that the children are all well protected by hats, shirts and sunscreens. Overexposure to the ultraviolet light present in the sun's rays can have various adverse effects, particularly in fair-skinned people, who produce only small amounts of the protective skin pigment melanin. Short-term overexposure to sunlight causes sunburn and can lead to heat exhaustion and heat stroke. Repeated overexposure over a long period can cause premature aging of the skin and increases the risk of skin cancer.
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