With students on the trail this morning at Aldo Leopold Nature Center, we discovered a whole bunch of hoar frost along the ground. Like summertime dew, hoar frost forms because air can no longer hold up the water in it. As the temperature drops overnight, colder air molecules are more spread out, and if they spread out enough, we reach the Dew Point. Now the water falls onto plants and the ground. In winter, the water falls as ice crystals which latch on to blades of grass, leaves, or your bedroom window.
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