Ancient Tree Contains Record of Earth’s Magnetic Field Reversal in Its Rings
Every 200,000 to 300,000 years, Earth’s magnetic North and South poles swap places, an event that opens the planet up to solar radiation and coincides with major extinction events.We’re long over due for such an adventure, with the last pole reversal occurring 780,000 years ago.Earlier this year, NASA warned that the magnetic “north pole” is racing 30 miles-per-year […]
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