How earth itself be a magnet ?
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The crust of the Earth has some permanent magnetization, and the Earth's core generates its own magnetic field, sustaining the main part of the field we measure at the surface. So we could say that the Earth is, therefore, a "magnet."
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The earth's magnetic field is believed to be generated by electric currents in the conductive irons alloys of its core, created by convection currents due to heat escaping from the core.
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