Because it consists basically of UV light. UV which is not in the human eye’s vision scale, is a wave. Just like all the things we see and hear, but it behaves way different because that wave has less space between the crests, shortening the wavelenght and changing its frequency
The simple reduction of this frequency can induce the wave to enter to organisms’ cells, and affect the chemical bonds that sustain DNA viable. That’s why it causes mutations (skin cancer, etc).
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