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为什么天空要下雨来
更新时间: 2020-07-03 00:00:00  

由于江、河、湖、海受到太阳照射,水就变成水蒸气。水蒸气上升又变作小水滴,最后变成云。组成云的小水滴或小冰晶受到下边气流的顶托,上升的气流也在不断把水汽众下面输送到云里,云里的小水滴或小冰晶在运动中相互碰撞,体积会增大,云下层的水滴慢慢变大,云彩上层的冰晶体积增大以后,掉到云彩层下部的水滴之间,水滴会越来越大。当这些水滴大到上升气流托不住它们的时候,就会下雨。

关键词: 为什么 天空 下雨

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