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简介：湿气遇到高山时被迫上升，同时也变冷并凝结成云，最终形成降雨，这就是所有淡水的来源。地球就在这无尽的蒸腾、凝聚、降雨的海陆间循环着水，也循环着生命，构成了生命不尽的长河。本节目介绍地球水循环对气候、环境和生物所产生的影响，以及对生命的意义。收起
自然发现——我们的地球 不尽长河（上）[人与自然]
自然发现 我们的地球——不尽长河（下）[人与自然]
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