High Cirriform Clouds Are Composed Almost Entirely of Ice Crystals

True/False

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.