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Earth freezes over
What would happen to the magnetic field of Earth if the planet suddenly freezes? (What will be the eventual value of the magnetic field and how long will it take to get there?)
Earth's magnetic field would decay away and cease to exists. Magnetic field is generated by the movement of molten lava that that makes up the core of the earth. If earth becomes frozen right through to its centre there is nothing to generate and regenerate the earth's magnetic field.
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