Discussion
The anvil shape of a mature cumulonimbus forms because
Answer: A
Correct answer: the rising air spreads out on reaching a stable layer
The updraught rises until it reaches the tropopause, where the temperature stops falling with height and the air is no longer buoyant. Unable to rise further, it spreads horizontally, and the strong upper winds draw the ice cloud downwind into the characteristic anvil. The flatness of the top marks the tropopause directly, which is why an overshooting top above it is a sign of an exceptionally strong updraught.
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