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[audioFiles]2015m7s/audio_ezfj_004_20153[/audioFiles]

游客2023-11-05  65
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答案                                 The Color of Snow
    Generally, the color of snow appears white./This is because the light we see from the sun is white./Most natural materials take in some sunlight./This gives them their color./However, when light travels from air to snow, some light is sent back, or reflected./Snow crystals have many surfaces to reflect sun light./Yet the snow does take in a little sunlight./It is this light that gives snow its white appearance./
    Sometimes, snow may appear to be blue./The blue light is the product of a long travel path through the snow./In simple terms, think of snow as a filter./A filter is designed to reject some substances,/while permitting others to pass through./In the case of snow, all the light makes it through if the snow is only a centimeter thick./If it is a meter or more thick, however, blue light often can be seen./
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