What process causes water vapor to sublimate directly into ice crystals in ice fog?

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Multiple Choice

What process causes water vapor to sublimate directly into ice crystals in ice fog?

Explanation:
Ice fog forms when water vapor in very cold air turns directly into ice crystals, skipping the liquid phase. This gas-to-solid transition is called deposition. Deposition creates the tiny ice crystals that make up ice fog. Sublimation is the reverse process (solid to vapor) and does not produce icy crystals in the air. Condensation would form liquid droplets (not ice), and evaporation is liquid turning into vapor, which isn’t what happens here.

Ice fog forms when water vapor in very cold air turns directly into ice crystals, skipping the liquid phase. This gas-to-solid transition is called deposition. Deposition creates the tiny ice crystals that make up ice fog. Sublimation is the reverse process (solid to vapor) and does not produce icy crystals in the air. Condensation would form liquid droplets (not ice), and evaporation is liquid turning into vapor, which isn’t what happens here.

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