Which altitude range corresponds with cirro clouds?

Cirro clouds are a type of high-altitude cloud characterized by their wispy appearance and are typically found at altitudes above 20,000 feet. The defining feature of cirro clouds is that they form in the upper levels of the atmosphere, where temperatures are lower, and they consist primarily of ice crystals.

Generally, the altitude range for cirro clouds starts around 20,000 feet and can extend up to about 40,000 feet, which is why the correct answer aligns with this altitude range. The presence of cirro clouds often indicates the onset of changes in weather patterns, as they can signal approaching weather systems.

The other choices do not accurately reflect the altitude range where cirro clouds are typically found. Lower altitudes, such as 0 to 6,500 feet or 6,500 to 20,000 feet, are generally occupied by stratocumulus, cumulus, and other types of low to mid-level clouds, while altitudes above 40,000 feet may refer to more specific types of clouds like noctilucent clouds or high cirrostratus clouds, but cirro clouds themselves are specifically denoted for the range up to about 40,000 feet.