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What is the “geodynamo”, and what is believed to be the cause of it?

What is the “geodynamo”, and what is believed to be the cause of it?
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What is the “geodynamo”, and what is believed to be the cause of it?

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User Jorne
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Our planet's magnetic field is believed to be generated deep down in the Earth's core. ... This flow of liquid iron generates electric currents, which in turn produce magnetic fields.
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User PiotrO
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