4.16. In Wikipedia, look up "Dynamo theory" and answer this question: What is a dynamo?a. The process by which protoplanetary discs heat up due to friction between colliding dust particles.b. The process by which compression due to gravitational forces causes internal heating of large bodies.c. The process by which colliding planetesimals induces newly formed planets and moons to be hot inside.d. The process through which a rotating, convecting, and electrically conducting fluid can maintain a magnetic field over astronomical time scales.

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