The Transylvania Times -

Photos from: Local Guide Highlights The Joys Of Winter Hiking

Needle ice on the Bracken Mountain Trail. Needle ice occurs when the temperature of the soil is above 0 °C and the surface temperature of the air is below 0 °C. The subterranean liquid water is brought to the surface via capillary action, where it freezes and contributes to a growing needle-like ice column.

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