Clouds are entirely made up of tiny droplets of
water. In fact, the droplets or ice crystals are
so small, they do not fall through the atmosphere,
because to them the atmosphere feels as thick
(viscous) as we would feel in syrup. That's how
clouds are able to stay up in the air. Clouds
absorb water from evaporation of the water on the
ground. The water that evaporates forms these
droplets in the upper atmosphere.
Clouds are made of tiny drops of water (or
crystals of ice). Water vapor (gas) in the air
condenses to form a liquid or solid when the air
is too cold to hold the water in it. On the
ground, this causes dew (liquid) or rime (ice),
but in the air, without anything to condense onto,
the water forms clouds of droplets or ice
crystals. If these droplets or crystals get big
enough that the wind can't hold them up anymore,
they fall to the ground as rain or as snow.
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