Lava rocks can preserve the direction of Earth’s magnetic field as they cool. Across ancient rocks, scientists find both polarities: the field has reversed many times. The last reversal was about 780,000 years ago. Today’s weakening does not mean a reversal is due, and these events have no regular schedule. Magnetic north and south change places; Earth’s rotation axis does not flip over. Rocks record past reversals, not a countdown. Visuals are original illustrations of rocks, generic laboratory contexts, and Earth—not field photographs or measured data.
Sources:
- USGS — evidence for magnetic polarity reversals: https://www.usgs.gov/faqs/it-true-earths-magnetic-field-occasionally-reverses-its-polarity
- USGS — whether a magnetic reversal is imminent: https://www.usgs.gov/faqs/are-we-about-have-a-magnetic-reversal
- NOAA NCEI — geomagnetic models FAQ: https://www.ncei.noaa.gov/products/geomagnetic-models/faq
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