The Complete Book of 100,000 Reasons Why
Favlit. ten thousand reasons why
为什么冬天会下雪？
1、冬天时，地球的北半球或南半球远离太阳，导致气温降低，空气中的水蒸气凝结成小冰晶。
2、当气温低于0摄氏度时，这些小冰晶会继续在空中飘落，形成雪花。
3、雪花形成的过程中，空气中的水蒸气直接凝华成冰晶，而不是先变成水滴再结冰，这就是雪花六角形结构的原因。
4、高空中的气流和温度变化会影响雪花的形状，使得雪花形态多样，每一片都是独一无二的。
5、当雪花足够重，无法被上升气流支撑时，它们就会从云中降落，形成我们看到的雪。
总之，冬天下雪是因为低温使得水蒸气凝结成冰晶，这些冰晶在空中形成雪花并降落，是地球气候和大气物理现象共同作用的结果。
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