"....Earth’s magnetic field is generated by the convection of molten iron in the planet’s core, around 1,800 miles beneath our feet. This superheated liquid generates electric currents that in turn produce electromagnetic fields. While the processes that drive pole reversal are comparatively less understood, computer simulations of planetary dynamics show that the reversals arise spontaneously. This is supported by observation of the Sun’s magnetic field, which reverses approximately every 11 years."

#science #earth #polereversal #planet #sun

https://www.discovermagazine.c....om/planet-earth/when