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Havbunnsspredning

Havbunnsspredning er dannelse av nytt areal med havbunn, og det skjer som følge av vulkansk aktivitet langs midthavsryggene. Når tektoniske plater beveger seg bort fra hverandre oppstår brudd i litosfæren. Magma stiger da opp gjennom disse bruddene, kjøles ned når det når overflaten og skaper ny jordskorpe.

Illustration: noaa.gov

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