Nålis, nåleis

Nålis (eller nåleis) er porøse lag av nåleformet is på eller mellom våte overflater, f.eks. jord og ferskvann. Den dannes typisk når temperaturen svinger rundt frysepunktet. De lange nålaktige krystallene i nålisen kan vokse over tid ved å trekke opp nytt vann fra overflata. De kan bli opptil 20 centimeter lange.

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