Why Do Some Rivers Carve Meanders That Seem to Defy Gravity?
为什么有些河流会形成看似违背重力的蜿蜒河道？
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Meanders form not from straight downhill flow but from subtle imbalances in water speed across curved channels.
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Faster flow on the outer bank erodes soil, while slower inner flow deposits sediment, gradually widening the curve.
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