The inner core of the Earth spins on its axis. The outer core also spins along with the inner core, but at a different rate, which leads to a creation of the dynamo effect. This effect would lead to the conventional currents in the core. This is responsible for the earth's magnetic field. Hence Earth acts as a natural giant electromagnet.
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http://www.wonderwhizkids.com/index.php/planet-earth
read more.....
http://www.wonderwhizkids.com/index.php/planet-earth
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