Most of our knowledge about what sits at the center of our planet comes from the study of seismic waves rolling out from earthquakes. Careful analysis of these waves can reveal the composition of rocks and metal below Earth's surface.
, then out the other side and back through the mantle again as more shear waves . The timing of that travel can be revealing.
"If you look at the north geomagnetic pole, it's currently moving at a speed of about 50 kilometers [31 miles] per year," This new study – and potentially future studies like it – could provide useful insights into exactly how the outer core and its convection are changing. While the changes noted here aren't huge, the more we know, the better.
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