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What creates Earth's magnetic field?
Answer 1:

I don't think it's entirely known, but it has to do with electrical currents conducting through the Earth's outer core, which is made of a molten mix of iron and nickel. The currents probably have something to do with the Earth's rotation, but from what I understand are not entirely understood. Electrical currents do create magnetic fields, though, and it is very likely that these currents are the source of Earth's magnetism.

Andy


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