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Earth's inner core is growing more on one side than the other – here’s why the planet isn't tipping

By Jessica Irving, Senior Lecturer in Geophysics, University of Bristol
Sanne Cottaar, Lecturer in Global Seismology, University of Cambridge
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More than 5,000 kilometres beneath us, Earth’s solid metal inner core wasn’t discovered until 1936. Almost a century later, we’re still struggling to answer basic questions about when and how it first formed.

These aren’t easy puzzles to solve. We can’t directly sample the inner core, so the key to unravelling its mysteries lies in collaboration between seismologists,…


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