Answer each of the following about the planetary magnetism for ten points.  
Answer each of the following about the planetary magnetism for ten points.  A. This most common model of planetary magnetism was posited by Bullard and Elsasser. In it, the circulation of a conducting fluid in the core of a planetary body transfers fluid kinetic energy to magnetic field energy, like in the namesake electromechanical device.
Answer each of the following about the planetary magnetism for ten points.  
{dynamo} model (or {dynamo} theory or {dynamo} mechanism)