Needle ice

Rarity: Common

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At a glance

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Notion

Domain

Science and technology

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What Wikipedia says

Needle ice is a needle-shaped column of ice formed by groundwater. Needle ice forms when the temperature of the soil is above 0 °C (32 °F) and the surface temperature of the air is below 0 °C (32 °F).

Excerpt from the Wikipedia article “Needle ice”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Jared Stanley, CC BY-SA 3.0, via Wikimedia Commons.