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geomagnetic reversal |
Also found in: Wikipedia, Hutchinson | 0.02 sec. |
geomagnetic reversalAlternation of the Earth's magnetic polarity. The Earth's internal magnetic field reverses, on average, about every 300,000 to 1 million years. This reversal is very sudden on a geologic time scale, apparently taking about 5,000 years. The time between reversals is highly variable, sometimes less than 40,000 years and at other times as long as 35 million years. No regularities or periodicities have yet been discovered. A long interval of one polarity may be followed by a short interval of opposite polarity. See also polar wandering. geomagnetic reversal [¦jē·ō·mag¦ned·ik ri′vər·səl] (geophysics) Reversed magnetization of the earth's magnetic dipole. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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| Sediment bearing stone tools was deposited between the polar reversals that occurred 1. |
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