Through improved computer models of the Earth
Earth's Inner Core Stopped Spinning and Now Has Changed Direction » Explorersweb
How does the Earth's rotation induce its magnetic field? - Quora
Vad är källan till kraften som gör att jorden snurrar runt sin
Earth's inner core may have started spinning other way, study shows
Is Earth's core lopsided? Strange goings-on in our planets interior.
Is it plausible that electromagnetism is causing the Earth to spin
Is Earth's magnetic field caused by the spinning of Earth itself
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Seismic data shows that the core is spinning the other way. Should we worry? - Smore Science Magazine
Does Earth's magnetic field keeps the planet spinning? - Quora
Earth's inner core may be slowing down compared to rest of planet
Earth's inner core may have reversed its original direction of spinning - The Week