A geomagnetic reversal changes the large-scale polarity of Earth's intrinsic magnetic field. Crustal remanent magnetization records past reversals. The reversal times are not a regular clock; their occurrence reflects time-dependent dynamo action rather than rigid rotation of a permanent magnet.
Geomagnetic reversal refers to a phenomenon where the Earth's magnetic field undergoes a complete flip, causing the magnetic north and south poles to swap places.
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