Pole shift refers to the Earth's magnetic field

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Pole shift refers to the Earth's magnetic field
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Tuesday, 25 January 2011 (Global) A pole shift refers to the Earth's magnetic field reversing its polarity. If a magnetic reversal occurred today, compasses would point south rather than north. In the past 15 million years scientists found pole shifts occurred four times every 1 million years. Though this averages out to once every 250,000 years, switches do not occur at regular intervals. During one period in the Cretaceous, polarity remained constant for as long as 30 million years, though this is believed to be an anomaly. The last pole shift took place 790,000 years ago; causing some scientists to believe we're due, while others speculate a reversal is already underway.

Link: http://www.wisegeek.com/what-is-a-pole-shift.htm

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