Discussion
Assertion (A): Mixed phase clouds can persist for hours despite being thermodynamically unstable.
Reason (R): Continuing updraught keeps forming new droplets as fast as the ice consumes them.
Answer: A
Both are true and the reason gives the sustaining mechanism, and Arctic stratocumulus are the classic long lived example. Without that supply the cloud would glaciate within minutes. Persistent mixed phase cloud requires continual droplet formation.
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