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Frostblomst (sjøis)

Frostblomster på sjøis er iskrystaller som dannes på is under spesielle værforhold. Du har sikkert sett det; små «blomster» vokser plutselig på isen. For at det skal oppstå må det være stille sjø, veldig tørr luft og mye kaldere i lufta enn i vannet. Frostblomster er nesten tre ganger saltere enn sjøvann, fordi når de dannes, kastes salt ut av den porøse sjøisen og opp i frostblomstene. De har blitt funnet å huse mikroorganismer, noe som betyr at hver blomst er et midlertidig lite økosystem, litt som korallrev.

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