Water vapor condenses into ice crystals
at high altitude where it is cold, and when the
crystals become large enough, the wind can no
longer keep them aloft and they fall. Hail
consists of droplets of liquid water forming at
low altitude and then being brought to high
altitude and freezing by thunderstorm
updrafts. They then fall, only to be caught in
another updraft, and repeating this process they
add layer upon layer of ice until they finally
fall to the ground.
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