Cirrocumulus clouds are primarily identified as:

Cirrocumulus clouds are classified as a rare type of cloud that often exhibits a distinctive pebbly appearance, resembling granules or small patches in the sky. This characteristic texture occurs at high altitudes, typically above 20,000 feet, where the air is cold and the clouds consist mainly of ice crystals. The formation of these clouds generally indicates moisture at high altitudes and can precede changes in weather patterns.

The identification of cirrocumulus clouds as a rare cloud with a pebbly pattern is particularly important for meteorologists and pilots, as these clouds can signify specific atmospheric conditions that are valuable for interpreting weather. Their formation typically does not lead to precipitation, but they can indicate that a larger weather system is present or approaching.

In contrast, the other options either mischaracterize cirrocumulus clouds or describe other types of clouds. The reference to a layer cloud with no definite pattern does not align with the distinct texture of cirrocumulus. Low and thick clouds are more descriptive of strata-type clouds, such as stratus or nimbostratus, which differ significantly from the high-altitude nature of cirrocumulus. Lastly, clouds with significant vertical development, like cumulonimbus, are also far removed from