The development of earth’s solid inner core had everything to do with the rejuvenation of the swirling liquid iron in the planet’s outer core, which generates its protective magnetic field, something that Mars doesn’t have.
, the Rochester scientists explain that about 565 million years ago, the magnetic field’s strength decreased to 10% of its strength today. Then, mysteriously, the field bounced back, regaining its strength just before the Cambrian explosion of multicellular life on earth.
Tarduno explained that earth’s magnetic field is generated in its outer core, where swirling liquid iron causes electric currents, driving a phenomenon called the geodynamo that produces the magnetic field. By studying the magnetism locked in ancient crystals—a field known as paleomagnetism—the researchers determined two new important dates in the history of the inner core.
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