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Earth has two pairs of poles, the geographic north and south poles and the magnetic north and south poles. The geographic poles are the two places where Earth's rotational axis, the imaginary line that represents the center of Earth's rotation, intersects the surface of the earth. The magnetic poles are where Earth's magnetic field diverges/converges, just like the poles of a bar magnet, except that Earth's north magnetic pole is comparable to the south pole of a bar magnet, and Earth's south pole is comparable to the north pole of a bar magnet. The locations of the geographic poles never change, but the magnetic poles wander around from time to time. In fact when studying the floor of the Atlantic Ocean for the first time scientists found evidence that the polarity of Earth's magnetic field completely reverses every few hundred millennia (the north and south magnetic poles switch places).

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