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Which type of cloud is famous for producing "mammatus" structures, which look like hanging pouches?

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Correct answer: Cumulonimbus

Mammatus clouds are most commonly formed on the underside of massive cumulonimbus storm clouds. These pouch-like shapes occur when cold air saturated with ice crystals sinks rapidly into warmer air. While they look ominous and are linked to severe storms, they actually indicate that a storm is weakening. Photo: Anton Yankovyi, Wikimedia Commons, CC BY-SA 4.0.

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Source: Wikipedia (CC BY-SA)

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