October 30. Earth's magnetic field is generated by the movement of liquid iron in the core at a depth of 3 kilometers. What led researchers to think about the relationship between tectonic plates and the magnetic field? The discovery that the convective flow of liquid iron play a role in the creation of the magnetic poles: experiments and modeling conducted over the past five years have shown that recovery occurs when the movement of the molten metal are no longer symmetric with respect to the equatorial plane. This "symmetry breaking" may be gradual, starting with the area at the core and the mantle. About 200 million years ago, Pangaea was almost all the land, and then began to split up into many small pieces. According to the surface of the continents, the researchers were able to calculate the degree of asymmetry (with respect to the equator) in the distribution of the continents in the period.
In conclusion: the asymmetry, varied at the same rhythm as the change of the magnetic poles. In other words, the higher center of gravity of the continents moved away from the equator, the faster the speed of recovery. Source: Physics