"It's crazy to think about just how old these rocks are," says #michigantech geophysics major Katie Bristol. She's pouring liquid nitrogen on a four-billion-year-old basalt sample as part of a study on Earth's magnetic field. #oldrocks #newmethods #geoscience #geophysics #womeninSTEM #liquidnitrogeniskindapretty #earthmagnetismlaboratory #ScienceAdvances @windshieldsmasher
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