Coastal & Marine Geology InfoBank

USGS CMG InfoBank: Reverse Polarity


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Comment: 23:03 - 23:26 (00:23)

Source: Annenberg/CPB Resources - Earth Revealed - 3. Earth's Interior

Keywords: "magnetic pole", "magnetic reversal", magnetism, "normal polarity", "reverse polarity"

Our transcription: During a time of normal polarity, magnetic lines of force leave the Earth near the South Pole and reenter the Earth near the North Pole.

During reversed polarity, the lines of force run the other way, going from north to south.

In other words, the magnetic poles switch places.

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Accessibility FOIA Privacy Policies and Notices
U.S. Department of the Interior \| U.S. Geological Survey URL: http://walrus.wr.usgs.gov/infobank/programs/html/school/moviepage/03.01.31.html Page Contact: InfoBank staff Page Last Modified: Wed Aug 20 06:13:34 PDT 2008 (wcs)