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Arroka Bolkanikoak, sumendietatik eta litosfera ozeaniko edo kontinentaletik, laba irten eta hoztean sortutako arroka igneoak dira. Magmaren hozte azkarrak kristal txiki askoren sorketa eragiten du. Harri bolkaniko ohikoenak, basaltoa, erriolita, andesita, dazita eta pumita
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