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https://www.nature.com/articles/s41561-018-0288-0 (article is behind a paywall).
Popular Science version:
https://motherboard.vice.com/en_us/...-field-collapse-ediacaran-core-solidification
Using samples of rock from the Ediacarian period, 565 million years ago, it was determined that the Earth's magnetic field was about 10 times weaker than it is today.
Popular Science version:
https://motherboard.vice.com/en_us/...-field-collapse-ediacaran-core-solidification
Using samples of rock from the Ediacarian period, 565 million years ago, it was determined that the Earth's magnetic field was about 10 times weaker than it is today.
The Earth’s core is thought to have been entirely liquid at some point, and the question of when it began to solidify has perplexed scientists for decades. Past estimates have ranged from 500 million years to 2.5 billion years ago. Bono’s team now presents evidence that nucleation began after 565 million years ago.
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