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再答： The liquid droplets (including supercooled water droplets) cloud body which is called water into clouds. If you have a water cloud cloud droplets increases as the condition, and the rain with a decreasing rate, then fall down is a rain or drizzle. Clouds are made up of ice is known as ice into the cloud, and by water (mainly the supercooled water droplets and ice crystals in clouds) together called hybrid cloud. From the ice into clouds or mixed cloud ice or snow falling, falling into the reservoir more than 0 ��, melt became raindrop falling to the ground, the formation of rain. In the process of the formation of rain, water droplets plays an important role in. When the droplet radius increased to 2 - 3mm, the attraction between water molecules are difficult to maintain such a big drop, landing in the way, it is easy to suffer the impact of airflow and division, through the "chain reaction". The big drop down, the small water droplets continue to exist, the formation of large droplets new. This is the strong updraft aqueous and mixed an important reason for the formation of rain Simple point says, is the water evaporated to form steam, water vapour is cooled, condensed, and fell to the ground, the formation of rain. You take a shower of careful observation on the roof, water to a certain extent will fall down, this process is the process of the rain
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