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What physical factor, alongside temperature, primarily determines the shape of a falling snowflake?

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Correct answer: Humidity levels

The famous Nakaya Diagram shows that snowflake morphology depends on both temperature and supersaturation, which is closely tied to humidity. As a crystal falls through different air layers, these two factors dictate whether it grows into a plate, a needle, or a classic star. Photo: Janek Lass, Wikimedia Commons, CC BY 4.0.

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Source: Wikipedia (CC BY-SA)

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