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1 3 4 A C D E G H I J L M N O P R S T U V W
Ultraviolet rays (UV) are energetic but invisible. Although Earth's atmosphere is acting as a protector shield against the major part of the harmful UV, the dangerous UV-B reaches the surface.
Prolonged exposure to ultraviolet radiation can cause significant damage to living organisms: sunburn, eye cataracts, accelerated skin aging, skin cancer,...