Discussion
Consider the following statements about mixed phase clouds.
1. They contain ice and supercooled liquid at the same time.
2. They are thermodynamically unstable and tend to glaciate.
3. They persist indefinitely once formed without change.
Answer: D
Correct answer: 1 and 2 only
Statements 1 and 2 are correct: a mixed phase cloud contains both, and it is thermodynamically unstable for exactly the reason given by the Wegener–Bergeron–Findeisen process - the ice grows at the liquid’s expense. Statement 3 contradicts the second. Such clouds persist only where a continuing supply of liquid, usually from an updraught, replaces what the ice consumes, and once that supply fails the cloud glaciates.
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