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We
live in the first eight miles of the atmosphere. No mountains,
birds and few civil aircraft reach higher. It is the home
of our familiar clouds and weather, of rainbows, glories
and ice crystal halos. It is the troposphere. Above it the
air thins, it drastically changes composition, two layers
of intense cold produce rare and dramatic clouds and in it
shines one of Nature’s
greatest spectacles, the aurora.
The next few pages make an upward journey past the troposphere
and through the tropopause,
the stratosphere and its ozone
layer and on to the mesosphere or
middle atmosphere with its intensely cold layer, the home of
the highest clouds.
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