Electromagnetic Pole Reversal
Magnetic Pole Reversal Derek LaVallie The Earth has a magnetic force due to its spinning it does as it rotates around the planet, combined with our liquid iron core. The rubbing of this liquid iron core and the non liquid mantle forms an electromagnetic field. ... Magnetic pole reversal occurs every 500,000 years, scientist estimate. ... Magnetic pole reversal is caused by vortices of liquid metal in the core near each of the magnetic poles. ... This leads to a weakening of the magnetic field in Earth, and eventually to a reversal. Scientists estimate that is has been 750,000 years since the last pole reversal.