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Rain is a phenomenon of natural precipitation, which is caused by disturbances in the atmospheric circulation. It is an indispensable part of the earth's water cycle. It is the only way to replenish fresh water from almost all terrestrial plants far from the river. Falling raindrops from the sky, there are big and small, fast and slow. The surface of the earth evaporates and rises in the cold to form rain. Rain is the most important freshwater resource in human life.
Water droplets falling from the clouds, the water on the surface of the land and the ocean evaporates into water vapor. When the water vapor rises to a certain height, it turns into cold water droplets. These small water droplets form a cloud, which collide with each other in the cloud and merge into The big water droplets, when it was too big for the air to hold, fell from the clouds and formed rain. Rainwater is the most important freshwater resource in human life, and plants must thrive on the moisture of rain and dew. But the flood caused by heavy rain will also bring huge disasters to mankind.