Earth’s Magnetic Field Fell to Half Its Modern Strength 260 Million Years Ago — But It Wasn’t Weak Enough to Cause a Mass Extinction
Earth Science • Geomagnetism • Deep Earth Tiny crystals formed during enormous volcanic eruptions in ancient China have preserved a remarkable record of Earth’s magnetic field. New research shows that the planet’s magnetic dipole weakened to roughly half its modern strength about 260 million years ago — yet Earth’s magnetosphere apparently remained strong enough to […]
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