The dynamo is the process that controls the Earths magnetic field. It is a boss thing to learn about. The Earths liquid outer core composed of iron convects under the influence of the inner core boundary and the core mantle boundary, and this movement of the conduting fluid over the Earths magnetic field lines produce electrical currents which in turn sustain the magnetic field. All really rather clever stuff.
Boy: "Teacher, why does the Earth have magnetic Poles?"
Teacher: "Because Pixies put it there."
Head Teacher: "No, it's because of the Dynamo action!"
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