Firn

Firn er en kornet ismasse (densitet: 450-830 kg/m3) der er sammensat af krystaller eller aggregater af krystaller af korn på størrelse op til 12 mm.

De dannes af rekrystallation og/eller flere omgange af frost at snefnug, specielt på den øvre del af gletsjere, hvor sneen ikke er blevet komprimeret til is endnu. Det er en overgangs fase mellem sne og glacial is. Hastigheden af processen, hvori sne bliver konverteret til glacial is afhænger af mange faktorer, så som mængden af nedbør, temperatur ændringer og mængden af smeltevand.

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