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north magnetic pole |
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| As recently as last October, the sun's magnetic north pole resided in the star's northern hemisphere, as it had for the previous 11 years. Every 10 or 20 thousand years, Earth's magnetic field reverses--the magnetic North Pole becomes the South Pole and vice versa. By analyzing the orientation of the grains, scientists can tell the position of the ancient continents relative to the magnetic north pole, which almost always lies close to the rotation axis. |
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