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What sustains Earth’s magnetic field? Creationists and secularists disagree on the answer, but a recent update from Physics Today seems to lend support to the creationists’ hypothesis that the magnetic field is both recent and decaying.I hope you're attracted to reading the rest of the article, click on "Earth's Young Magnetic Field Revisited".
Magnetic fields naturally decay with time. If Earth were billions of years old, its magnetic field should be gone by now. But it isn’t. This has forced secular scientists to propose a recharging mechanism called a dynamo that supposedly sustained Earth’s magnetic field over billions of years.