Discussion
Assertion (A): Snowflakes are largest when formed near minus fifteen degrees.
Reason (R): Dendrites forming there interlock readily and aggregate into large flakes.
Answer: B
Both are true and the reason gives the mechanism, and the rapid growth at that temperature produces the branched shapes. Aggregation efficiency depends strongly on habit as well as on temperature. Dendrites interlock in a way that compact crystals cannot.
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