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Orogenese

Orogenese er dannelse av fjellkjeder som skjer når en kontinentalplate blir presset inn fra sidene. Dette tvinger jordens litosfære (skorpe og øverste mantel) til å krumme seg og skyve en del av den kontinentale platen oppover. Resultatet er en eller flere fjellkjeder. Vanligvis skjer dette når to eller flere kontinentale plater kolliderer (se platetektonikk). Noen velkjente eksempler er fjellkjeder som Himalaya og Alpene.

Her er en enkel illustrasjon av hvordan en fjellkjede kan dannes.

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