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Isark (innlandsis)

Isark (også kalt innlandsis) er et tykt isdekke som sprer seg på grunn av sin egen vekt og dekker en overflate på mange tusen kvadratkilometer. Det formes på samme måte som vanlige isbreer. De største isarkene er: Grønlandsisen (1 730 000 km2) på den nordlige halvkule og isarken over Antarktika (13 829 000 km2) på den sørlige halvkule. Omtrent 99% av alle isbreer i verden er utløpere av disse store isarkene.

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