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所谓水的循环,是指在太阳入射能量和地球表面热能的共同作用下,地表水不断被蒸发成为水蒸气,进入大气。水蒸气遇冷后凝结成水或冰,在地球重力作用下,以降水形式落至地表,这种水的周而复始的运动过程。水是地球最原始的物质存在之一,水的循环,也使得水的作用得以持续起效。循环水的量据统计,每年大约有50.5万立方千米的水从海洋表面蒸发到大气中,这其中约90%的水以降水形式再返回海洋,其余10%则被风带到大陆上空,与陆地表面蒸发的越7.2万立方千米的水汇合,形成大陆每年11.9万立方千米的总降水量。落至地表
The so-called water cycle, refers to the solar incident energy and the Earth’s surface of the combined effect of heat, surface water is constantly being evaporated into water vapor, into the atmosphere. Water vapor condensation into water or ice in the cold, under the influence of the Earth’s gravity, precipitation fell to the surface in the form of precipitation, this water cycle motion. Water is one of the most primitive substances in the earth. The circulation of water also enables the water to work continuously. According to statistics, about 500,000 cubic kilometers of water evaporates into the atmosphere from the surface of the ocean each year, of which about 90% of the water returns to the ocean in the form of precipitation and the remaining 10% is carried by the wind over the mainland. And the more 7.2 million cubic kilometers of water that evaporates on the land surface combine to form 119,000 cubic kilometers of total annual precipitation in the mainland. Fall to the surface