High cirriform clouds are composed almost entirely of ice crystals. In tropical regions, air temperatures low enough to freeze all liquid water usually occur only above 6000 m (about 20,000 ft). In polar regions, however, these same temperatures may be found at altitudes as low as 3000 m (about 10,000 ft). Hence, while you may observe cirrus clouds at 3600 m (about 12,000 ft) over northern Alaska, you will not see them at that elevation above southern Florida.
a. True
b. False
Question 2
In Ralph Abercrombys and Hugo Hildebrandssons cloud classification system, each of the four primary cloud groups is identified by the type of precipitation it produces.
a. True
b. False
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