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magnetic pole reversal

 
Geography Dictionary: magnetic pole reversal

The earth's magnetic field resembles that of a bar magnet located at the earth's centre. The axis of the imaginary bar magnet emerges from the earth's surface at the magnetic poles. The north and south magnetic poles have repeatedly changed places while the axis has stayed in the same position. The timing of the intervals between such magnetic polarity reversals seems to be irregular. See also geomagnetism.

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Geography Dictionary. A Dictionary of Geography. Copyright © Susan Mayhew 1992, 1997, 2004. All rights reserved.  Read more