Discussion
Consider the following statements about hail growth.
1. The stone must remain in supercooled liquid to accrete mass.
2. A strong updraught is needed to keep it aloft long enough.
3. Hail grows chiefly by vapour deposition rather than accretion.
Answer: A
The first two are correct and are the essential requirements. The third is wrong, since deposition is far too slow to build a stone of centimetre size in the time available. Accretion of supercooled water is the only viable route.
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