What ingredients are needed to power a dynamo effect inside a planet?a. A highly conductive liquid metallic interior that is circulated by convection and spun by the rapid rotation of the planet.b. Rapid rotation and more than one moon with short orbital periods that are close to the planet's surface.c. A massive solid iron core with a low density that has a temperature high enough for radioactive decay.d. A liquid iron core with a high density that is covered by a thick layer of liquid metallic hydrogen.

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