Torben Struve in the lab. Credit: University of Oldenburg (IMAGE)

Columbia Climate School

Torben Struve in the lab. Credit: University of Oldenburg

Caption

Torben Struve adds iron to a sediment-core sample, turning it yellow, then raises the pH with ammonia to precipitate uranium and thorium alongside the iron. U and Th isotope measurements helped the team estimate how much algae-related material sank from the surface ocean to the seafloor in the past. Photo: Torben Struve.

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University of Oldenburg

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