023 The Big Magnetic Flip

Published: Oct. 24, 2017, 5 a.m.

In a previous episode we have mentioned that the magnetic field of the Earth through goelogical time has undergone variations in intensity and even reversals with the north magnetic pole migrating to close to the south pole and vice versa for the south magnetic pole. How do we know this and what consequences for life on the planet could it have had?