Earth's mantle, not its core, may have generated planet's Early magnetic field

(University of California - San Diego) A trio of studies are the latest developments in a paradigm shift that could change how Earth history is understood. They support an assertion by a Scripps Institution of Oceanography geophysicist that a once-liquid portion of the lower mantle, rather than the core, could have exceeded the thresholds needed to create Earth's magnetic field during its early history.