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The earth’s core is known to contain iron. Yet geologists do not regard this as a source of the earth’s magnetism. Why?

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The earth’s core is known to contain iron. Yet geologists do not regard this as a source of the earth’s magnetism. Why?

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The earth’s core does contain iron but in the molten form only. This is not ferromagnetic and hence it cannot be treated as a source of earth’s magnetism.

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