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.

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Quizplus · Accepted Answer

The information given indicates that cirrus clouds may be observed at lower elevations in polar regions compared to tropical regions, so it is true that cirrus clouds may be observed at 3600 m over northern Alaska but not above southern Florida at the same elevation.

High Cirriform Clouds Are Composed Almost Entirely of Ice Crystals