Nåleis er masser af frosset vand, udviklet som lagdelte kolonner af is som følge af konsolidering af successive underjordsvand eller overfladevand som flyder i den kolde årstid foran gletsjere. Udbredelsen af nåleis afhænger af mængden af vand som migrerer i det tilhørende isdække.
Deres tykkelse stiger med kapillær absorption af et snedække.
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