Discussion
Arrange these stages in the descent of a stratiform snowflake in order.
1. melting and the bright band
2. growth by deposition above the melting level
3. arrival at the surface as a raindrop
4. aggregation into a larger flake
Answer: C
Correct answer: 2 - 4 - 1 - 3
The sequence follows the temperature the particle passes through as it falls. It grows first by deposition of vapour in the cold cloud above, then aggregates with other crystals into a larger flake as it descends into warmer air where crystals stick more readily, then melts at the freezing level - producing the radar bright band - and finally arrives as a raindrop. Most mid-latitude rain has this history.
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