Discussion
Assertion (A): Sectioning a hailstone reveals concentric layers of clear and opaque ice.
Reason (R): The stone passes through regions of differing temperature and liquid water content.
Answer: B
Both are true and the reason gives the origin of the banding, and it records the trajectory the stone followed. Counting the layers does not, however, count the number of circuits reliably. Modern trajectory modelling has complicated the older reading.
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