Old rocks, biased data: Overcoming challenges studying the geodynamo

Gleaning data from old rocks may result in bias. Now, geophysicists have a way to improve their methods to overcome challenges in studying the history of the Earth's core and magnetic field that make up the geodynamo.Michigan Tech undergraduate Katie Bristol preps a magnetized rock sample with liquid nitrogen 
[Credit: Michigan Tech, Sarah Bird]Since researchers cannot visit the core, they use rocks at the surface as a proxy....
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