Geodynamo recharged

@article{Driscoll2019GeodynamoR,
  title={Geodynamo recharged},
  author={Peter Edward Driscoll},
  journal={Nature Geoscience},
  year={2019},
  volume={12},
  pages={83-84}
}
Transition from a weak and erratic geomagnetic field to a more stable one around 560 million years ago, inferred from palaeomagnetic measurements, suggests that the inner core may have solidified around that time, much later than thought. 

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