The darkest clouds, often associated with thunderstorms, are defined by their enormous vertical extent. What are these clouds called?

Answer

Cumulonimbus clouds

Cumulonimbus clouds are the engines of thunderstorms, characterized by their massive vertical extent, resulting in a nearly black base due to extreme light blocking.

The darkest clouds, often associated with thunderstorms, are defined by their enormous vertical extent. What are these clouds called?
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