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Iron helped scientists trace Earth's oxygen. Now it's telling a bigger story

For decades, scientists have studied iron preserved in ancient rocks to reconstruct how Earth's oceans and atmosphere became rich in oxygen. A new study suggests iron has recorded other major transformations too.

Iron helped scientists trace Earth's oxygen. Now it's telling a bigger story

We haven't written up this one. Phys.org has the full story — the link below goes straight to it.

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