Discussion
Match each crystal habit with the temperature at which it forms.
List I
A. Plates
B. Needles
C. Dendrites
D. Columns
List II
1. near minus 15 degrees
2. near minus 2 degrees
3. near minus 30 degrees
4. near minus 5 degrees
Answer: D
Correct answer: A-2, B-4, C-1, D-3
The habit changes with temperature in a sequence that reverses twice. Plates form near minus 2, needles near minus 5, dendrites near minus 15, and columns again below about minus 22, near minus 30. The alternation between plate-like and column-like growth arises from which crystal face grows faster at each temperature, and it means the shape of a snow crystal records the temperature it grew at.
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