The geodynamo is the process that generates the Earth's magnetic field. It occurs in the outer core, where molten iron and nickel move due to convection currents. These movements create electric currents, which in turn produce magnetic fields. The combination of these magnetic fields results in a stable, global magnetic field that protects the Earth from solar radiation. This magnetic field is crucial for life on Earth, as it shields the planet from harmful cosmic rays and solar winds. The geodynamo is also responsible for phenomena such as magnetic poles and geomagnetic reversals, where the magnetic north and south poles switch places over geological time.