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Sunlight comes down and heats up the surface... and that heat needs to be convected away... by hot blobs of air.
Then there's a thick layer of liquid iron, which is convecting churning motions, which give rise to the magnetic field.
Sunlight comes down and heats up the surface... and that heat needs to be convected away... by hot blobs of air.
Then there's a thick layer of liquid iron, which is convecting churning motions, which give rise to the magnetic field.