| 21. | What broke down Equitrack was the ultraviolet rays of the sun.
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| 22. | But you don't fancy a convertible with the attendant ultraviolet rays.
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| 23. | It is advantageous because ultraviolet rays do not leave residue, while chlorine does.
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| 24. | Ozone in the stratosphere shields living organisms from harmful ultraviolet rays.
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| 25. | They didn't talk about sunscreens and ultraviolet rays in those days.
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| 26. | In 1993, world record was accomplished for generation of continuous coherent Ultraviolet rays.
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| 27. | What does it take to prove ultraviolet rays exist to you?
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| 28. | Fortunately, the worst ultraviolet rays are blocked by a good sunscreen.
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| 29. | In the upper atmosphere, ozone protects the Earth from ultraviolet rays.
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| 30. | Ozone forms a protective layer that shields the earth from damaging ultraviolet rays.
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