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熱能 水迴圈包括四個主要環節:蒸發、輸送、降水和徑流.水吸收了太陽的熱量,以水蒸氣的形式在運動著,當蒸發的水汽遇冷凝結時,這些熱量又重新被釋放出來.所以水迴圈的動力主要是熱能.
水迴圈是指地球表面各種形式水體不斷相互轉化從而發生周而復始的過程. 其最主要的動力是太陽輻射和重力作用.
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