Answer 1:
Yes, clouds move, even if they sometimes
appear not to. How could that work?
Air in the atmosphere is in constant motion,
driven by differences in temperature. All air
contains some water vapor, but it is typically
invisible. Clouds are formed when water vapor
condenses into droplets, which are suspended
instead of dissolved in the air. This is usually
caused by a quick change in temperature, like when
warm humid air encounters colder air, cold ground
or water (a lake or ocean). Clouds also occur when
a mountain forces air higher.
Defining the boundary of a cloud can be
difficult, as the borders are diffuse – the small
droplets are spread apart and can be stretched
apart in the wind. The droplets at the edges are
also dissolving back into the air as they get
spread out. But the droplets do move in the wind
and clouds do move over time – how fast they move
depends on the wind speed.
Sometimes air currents predictably form clouds
in certain places, often around mountains. It can
appear that these clouds are not moving at all! In
these places, changes of temperature and pressure
cause water to condense, but dissolve back into
the air when it leaves that area. There are also
places where the air is still but the air around
them is moving so fast that clouds get trapped in
the “dead” air
My favorite photo of this phenomenon is
here:
click here to see
For more lenticular clouds like this, check out
this Wiki page:
here
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