earth's magnetic field is created by electric currents that are created by convection currents in the iron of the earth's core. As the earth's core cools, it wi

earth's magnetic field is created by electric currents that are created by convection currents in the iron of the earth's core. As the earth's core cools, it will decrease the strength of its magnetic field and allow increasing amounts of solar wind (charged particles from the sun) that will destroy the ozone layer and lead to the eventual dissipation of the atmosphere. This is probably what happened to mars.