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Sienar_IX t1_j6jg526 wrote

I think this is deposition; a phase change (condensation, evaporation, etc.) where the cold morning air skips the liquid moisture phase and directly becomes a solid, the frost.

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weaselmaster t1_j6k3bgm wrote

No, pretty sure the Heave thing is correct, especially since it can essentially be ‘underground’ when muddy soil freezes hard and pushed the water content upward as ice.

I come across it all the time here in the NE, on winter hikes mostly, especially on a cold (20° or below) morning when the previous day was warmer/rainy.

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