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Cumulonimbus clouds are indeed classified as clouds with significant vertical development. These clouds are known for their towering structure, which can reach high altitudes in the atmosphere, sometimes extending up to the stratosphere. Their vertical growth is indicative of strong convection processes—where warm air rises, cools, and condenses to form clouds.

Cumulonimbus clouds are often associated with severe weather phenomena, such as thunderstorms, heavy rainfall, and even tornadoes. This vertical development is a key characteristic that distinguishes them from other cloud types, which may be more layered or spread out horizontally.

The other classifications of clouds mentioned are more about their altitude or appearance rather than their vertical development. Low-level clouds are typically found from the surface up to about 6,500 feet, medium-level clouds are usually between 6,500 and 20,000 feet, and thin, wispy clouds (like cirrus clouds) do not exhibit significant vertical growth. Therefore, the defining feature of cumulonimbus clouds is their considerable vertical dimension, making the classification as clouds with significant vertical development the correct one.