soil's magnetic field shields us from deadly cosmic radiation,and without it, life as we know it could not exist here. The motion of liquid iron in the planet's outer core, and a phenomenon called a "geodynamo," generates the field. But how it was first created and then sustained throughout soil's history has remained a mystery to scientists. New work published in Nature from a team led by Carnegie's Alexander Goncharov sheds light on the history of this incredibly distinguished geologic occurrence.
Source: phys.org