Hoarfrost is the frozen dew particles or molecules of water from the air, which, when the temperature falls below freezing, are deposited upon grass, twigs, herbage, and other objects. As its formation is most marked in a calm atmosphere, hoar frost occurs abundantly at the bottom of valleys and land-locked places; and if these are sheltered from the sun’s rays, may remain unmelted after the ice has disappeared from the surrounding plains. (The American People’s Encyclopedia 1948).
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