Magnetic anomalies Oceanic crust

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the oceanic crust displays pattern of magnetic lines, parallel ocean ridges, frozen in basalt. symmetrical pattern of positive , negative magnetic lines emanates mid-ocean ridge. new rock formed magma @ mid-ocean ridges, , ocean floor spreads out point. when magma cools form rock, magnetic polarity aligned then-current positions of magnetic poles of earth. new magma forces older cooled magma away ridge. process results in parallel sections of oceanic crust of alternating magnetic polarity.








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