What is the evidence that the earths magnetic field is not emanating from permanently magnetized material, even

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What is the evidence that the earth’s magnetic field is not emanating from permanently magnetized material, even though it might seem that the earth has a strong bar magnet at its center?

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The Physical Universe

ISBN: 978-0077862619

16th edition

Authors: Konrad B Krauskopf, Arthur Beiser

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Question Posted: Oct 08, 2009 12:55 AM

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What is the evidence that the earths magnetic field is not emanating from permanently magnetized material, even

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The Physical Universe

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