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Earth's north magnetic pole has been drifting so fast in the last few decades that scientists say that past estimates are no longer accurate enough for precise navigation. They released an update Monday of where magnetic north really was, nearly a year ahead of schedule.The U.S. National Oceanic and Atmospheric Administration and the U.K. tend to update the location of the magnetic north pole every five years in December, but this update came early because of the pole's faster movement.There is a hot liquid ocean of iron and nickel in the planet's core where the motion generates an electric field, said University of Maryland geophysicist Daniel Lathrop, who wasn't part of the team monitoring the magnetic north pole.
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