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High clouds that are formed entirely from ice
crystals. They appear delicate and wispy and can reach a height of 35,000 feet
(10,700 meters). Other types of cirrus clouds include cirrostratus and
cirrocumulus. Cirrostratus is a thin sheet of cloud that often causes a halo to
appear around the sun or moon. Cirrocumulus look like many small tufts of
cotton; however, these clouds rarely form.
[Journal of Applied Meteorology. v
31, page 370, 1991.] [Journal of the Atmospheric Sciences. v 46, page 2293,
1989.]
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