| 1. | Aircraft flying polar routes near the geomagnetic poles are at particular risk.
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| 2. | It is actually an oval centered on the geomagnetic poles.
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| 3. | Geomagnetic poles cannot be reliably determined for Devonian or older rocks thanks to the folding.
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| 4. | Over several thousand years, the average location of the geomagnetic poles coincides with the geographical poles.
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| 5. | However, the approximation is imperfect, and so the Magnetic and Geomagnetic Poles lie some distance apart.
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| 6. | The "'geomagnetic poles "'are antipodal points where the axis of a best-fitting dipole intersects the Earth's surface.
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| 7. | To analyze global patterns of change in the geomagnetic field, geophysicists fit the field data to a geomagnetic poles.
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| 8. | Poker Flat lies under the auroral zone, a doughnut-shaped expanse of sky around Earth's geomagnetic pole near Thule, Greenland.
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| 9. | The frequency of Earth's field NMR for protons varies between approximately 900 Hz near the equator to 4.2 kHz near the geomagnetic poles.
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| 10. | If the Earth's field were exactly dipolar, the north pole of a magnetic compass needle would point directly at the North Geomagnetic Pole.
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