Vast ‘doughnut’ discovered in molten metal of Earth’s core - The Guardian

1. Vast ‘doughnut’ discovered in molten metal of Earth’s core  The Guardian
2. Doughnut-shaped region found inside Earth's core deepens understanding of planet's magnetic field  Phys.org
3. ANU geophysicist Professor Hrvoje Tkalčić (IMAGE)  EurekAlert
4. A doughnut-shaped structure beneath Earth’s surface provides clues to the planet’s magnetic field  Cosmos