| 11. | The lenses, which protect against ultraviolet rays, are round, oblong or square.
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| 12. | Darker-skinned people need to be exposed longer to the ultraviolet rays.
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| 13. | Have your child wear safe sunglasses, which protect the eyes from ultraviolet rays.
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| 14. | Nevertheless, tourists should be careful with exposure to solar ultraviolet rays.
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| 15. | The most energetic ultraviolet rays never get out of the galaxy.
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| 16. | Other solar radiation, particularly ultraviolet rays, however, may cause severe sunburn.
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| 17. | Laser surgery is not an option since lasers emit ultraviolet rays.
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| 18. | It protects him from 99 . 9 percent of the sun's ultraviolet rays.
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| 19. | The granules protect the shingles against the sun's ultraviolet rays and provide color.
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| 20. | The ozone layer prevents harmful ultraviolet rays from reaching the earth.
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