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为什么水会流成河流呢？

水流成河的原因是由于重力和地形起伏。水会沿着高地向低地流动，被引力所影响。当降雨或融雪导致水量增加时，水会聚集并在地表寻找最低的路径流动。随着水流的积累和扩散，形成了我们常见的河流系统。河流中的水流不断加大，同时还受到陆地的形状和地质构造的影响，形成了各种大小不一的河道。

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