What is the phenomenon where a magnetic field is generated by rotating or flowing electrically conductive fluids, crucial for generating the Earth's magnetic field?

💡 Solution & Explanation

The dynamo effect describes how convective motion of electrically conducting fluid within planetary cores generates self-sustaining magnetic fields. The Meissner effect relates specifically to superconductivity rather than planetary fluid dynamics. This geomagnetic process shields the Earth's surface from harmful solar wind radiation.