云端漫步!美到窒息的壮丽云朵
[*]2012-04-13 08:32
[*]环球图片论坛
[*]http://himg2.huanqiu.com/attachment2010/120409/zip1333938956/1333938956_2.jpg 云是指停留大气层上的水滴或冰晶胶体的集合体。云是地球上庞大的水循环的有形的结果。太阳照在地球的表面,水蒸发形成水蒸气,一旦水汽过饱和,水分子就会聚集在空气中的微尘(凝结核)周围,由此产生的水滴或冰晶将阳光散射到各个方向,这就产生了云的外观。
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