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Astenosfære

Astenosfære er et geologisk sjikt i jorda som ligger under litosfæren, typisk 10-20 km under jordoverflata (se figur). Det består av ganske fast mantel, men det skjer mye bevegelse, i form av såkalte mantelstrømmer. Astenosfæren er involvert i kreftene fra de tektoniske platene i litosfæren, som sakte men sikkert former havlandskapet, og dermed også havstrømmene som er så viktig for livet på jorda.

Illustration: leeds.ac.uk

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