When the temperature of the air falls and the amount of water vapor the air can hold decreases, the water vapor transforms into water droplets or ice crystals and makes up the clouds in the sky.
When the air receives high pressure and there is a downward flow or wind, the air moving downward becomes warmer. Because of this temperature rise, the water droplets or ice crystals return into water vapor again and the clouds disappear.
Clouds appear and drift in the sky, change their shapes constantly, scatter and disappear in the wind, and emerge again out of nowhere as if by magic.
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