Relating to Earth's magnetic field or the magnetism produced by the Earth.
From geo- (Greek 'earth') + magnetic (from magnet, ultimately from magnesia, a region in ancient Greece). This compound appeared in scientific writing in the 19th century.
Earth's magnetic field, which has flipped polarity hundreds of times in its 4.5-billion-year history, is recorded in rocks like a perfect time capsule—geomagnetic reversals help scientists date ancient lava flows!
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