From Wikipedia, the free encyclopedia
河牀,江河溪涌渠等流水道嘅底,方便起見叫河。佢嘅邊界為河岸。山上水流成溪谷河谷,流水急沖擦谷底,撞出泥石。平原則相反,泥石沉積河牀,一旦淺窄就會改道。河牀喺水底,然而河乾,就會露出來。又或者江河改道,舊道或會乾涸,因而曝露。
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