✔ 最佳答案
水循環是指水由地球不同的地方透過吸收太陽以來的能量轉變存在的模式到地球中另一些地方,例如:地面的水份被太陽蒸發成為空氣中的水蒸氣。而水在地球的存在模式包括有固態、液態和氣態。而地球中的水多數存在於大氣層中、地面、地底、湖泊、河流及海洋中。水會透過一些物理作用,例如:蒸發、降水、滲透、表面的流動和表底下流動等,由一個地方移動至另一個地方。如水由河川流動至海洋。
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The Earth's water is always in movement, and the water cycle, also known as the hydrologic cycle, describes the continuous movement of water on, above, and below the surface of the Earth. Since the water cycle is truly a "cycle," there is no beginning or end. Water can change states among liquid, vapor, and ice at various places in the water cycle, with these processes happening in the blink of an eye and over millions of years. Although the balance of water on Earth remains fairly constant over time, individual water molecules can come and go in a hurry.