Ice crystals form.
Meaning: This means that when water vapor in the atmosphere freezes, it forms tiny, intricate ice crystals. It's like saying, When the temperature drops, the water vapor in the air turns into tiny ice crystals.
Choice of Words: Ice is a solid form of water that forms at temperatures below freezing. Crystals are solid materials whose atoms or molecules are arranged in a highly ordered, repeating pattern. Form means to come into existence or take shape.
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