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Question:

How could earths magnetic field magnetize an iron bar over many years?

plzz help this is for my physics H.W

Answer:

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Ferromagnetic materials are randomly distributed, but in a magnetic field, they can become aligned in the direction of the magnetic field. The earth's magnetic field has a fairly stable direction over very long time periods (many thousands of years). The earth's reversals of its magnetic field is well preserved in rocks in the oceanic crust. New molten rock is created, it cools, it records and remembers the direction of the magnetic field at the time the lava cooled. The reversal pattern preserved in iron rocks (and others) helps document Sea floor spreading

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