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为什么河流会弯曲？

河流的弯曲是由于河水在流动过程中受到地质构造和地形地貌的影响。地质构造导致地壳产生断裂和抬升，而地形地貌则决定了河流所要穿越的路径。当河流遇到较硬的地质层时，水流会被阻碍，不断侵蚀周围较软的地质层，使河道发生弯曲。

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