According to modern dynamo theory, the production of a planetwide magnetic field around a terrestrial-type planet appears to require

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Modern dynamo theory suggests that a planetwide magnetic field is generated by the movement of a conductive fluid, typically in a molten metallic core, combined with the planet's rapid rotation. This movement and rotation create a dynamo effect that produces the magnetic field. A permanently magnetized solid core (option B) does not align with the dynamo theory's mechanism for generating a magnetic field.

According to Modern Dynamo Theory, the Production of a Planetwide