Small magnetic waves have been discovered at Earth's core, with each oscillation working on a seven year cycle. Earth's magnetic field is generated by electric currents generated by the movement of ...

The waves creep across the outer core every seven years. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. Scientists have detected a completely ...

Earth’s solid inner core appears to have changed shape in the past 20 years or so, according to seismic wave measurements – but the behaviour of these waves could also be explained by other shifts at ...