Rain

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Rain or rainfall is a form of atmospheric precipitation composed of droplets of water aerosols that have condensed from atmospheric water vapor and fall by gravity. Depending on the intensity, rain can be described as a drizzle (very light, sporadic rainfall), a shower (brief, moderate rainfall), a cloudburst (brief heavy rainfall) or a downpour (prolonged heavy or "torrential" rainfall). It is also often accompanied by other weather phenomena such as strong wind (rainstorm) and lightning (thunderstorm), and may be mixed with hail/ice pellet, snow (sleet) and sandstorm (dust rain). Rain is a major component of the water cycle and is responsible for depositing most of the fresh water on Earth. It provides water for hydroelectric power plants, crop irrigation, and suitable conditions for many types of ecosystems. The major cause of rain production is moisture moving along three-dimensional zones of temperature and moisture contrasts known as weather fronts. If enough moisture and upward motion...

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