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Sigma KEE - Precipitation
KB Term: 
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Precipitation 是水分子以液体或结冰状态从天上掉到 地上的过程。
Relationships      
Parents 落下 Falling is the class of events in which something moves from a higher location to a lower location under the force of gravity.
  水运动 Any LiquidMotion where the Liquid is Water.
  天气过程 WeatherProcess is the broadest class of processes that involve weather, including weather seasons (not to be confused with instances of SeasonOfYear), weather systems, and short-term weather events.
Children 冻雨FreezingRain occurs when Raindrops go through the Process of Supercooling at a few hundred Meters above a GeographicArea, then undergo &freezing on contact with Objects on the ground to become Solid.
 下冰雹Hailing is a form of Precipitation Process in which Water falls in a Solid state.
 降雨Raining is a Precipitation Process in which Water falls in a Liquid state. The size of an raindrop is between 0.1-9 Millimeter in approximateDiameter.
 雨夹雪Sleeting is a form of Precipitation composed of Rain and partly melted Snow.
 降雪Snowing is a Precipitation Process in which Water falls in a Solid state, as MonoCrystalline Ice.


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