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Cryopeg

Cryopeg er linser af afkølede vandkulder eller et lag ufrostet jord, der er permanent kryotisk (der udgør en del af permafrosten), men frysning forhindres ved frysepunktsdepression på grund af indholdet af opløst faststof eller porevandet.

Cryopeg udgør den eneste habitat på Jorden, der er præget af permanent subzero temperaturer, høj saltholdighed og isolation fra påvirkning af eksterne faktorer i geologisk tid. Cryopegs er levested for mikroorganismer, ligesom bakterier.

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