Cumulus cloud

Cumulus clouds are clouds that have flat bases and are often described as puffy, cotton-like, or fluffy in appearance. Their name derives from the Latin cumulus, meaning "heap" or "pile". Cumulus clouds are low-level clouds, generally less than 2,000 m (6,600 ft) in altitude unless they are the more vertical cumulus congestus form.

Cumulus clouds may appear by themselves, in lines, or in clusters.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY-SA 3.0

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