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How is the formation of frost different from most other kinds of ice?

Answer:

While most ice forms from liquid water, frost and snow skip the liquid step. Instead, water vapor is deposited directly to the ice crystal as a solid. This process is called deposition, also known as desublimation. It is the opposite of sublimation, in which matter changes from a solid to a gas without going through the liquid phase. A good example of that is frozen carbon dioxide, also known as dry ice.
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