Seismic waves generated by earthquakes travel through Earth’s solid iron inner core faster in the direction of the rotation axis than along the equator. Scientists created a core growth model to explain this. To fit seismic data, the model predicts that asymmetric growth of the core leads to crystal movement that preferentially aligns iron-nickel crystals north-south. The model implies that the core is only 0.5-1.5 billion years old, a fraction of Earth’s age.
Title: Is Earth’s core lopsided? Strange goings-on in our planet’s interior
Sourced From: www.sciencedaily.com/releases/2021/06/210603111925.htm
Published Date: Thu, 03 Jun 2021 11:19:25 EDT
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