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https://phys.org/news/2024-08-doughnut-region-earth-core-deepens.html

A doughnut-shaped region thousands of kilometers beneath our
feet within Earth's liquid core has been discovered by scientists
from The Australian National University (ANU), providing new
clues about the dynamics of our planet's magnetic field.

The structure within Earth's liquid core is found only at low
latitudes and sits parallel to the equator. According to
ANU seismologists, it has remained undetected until now.

The Earth has two core layers: the inner core, a solid layer,
and the outer core, a liquid layer. Surrounding the Earth's
core is the mantle. The newly discovered doughnut-shaped
region is at the top of Earth's outer core, where the liquid
core meets the mantle.