Blog Post Image: Dust in the wind drove iron fertilization during ice age

Microscopic image of a live planktonic foraminifera species Globigerina bulloides. A team led by Princeton and ETH Zurich researchers analyzed the organic nitrogen trapped within the walls of the fossil shells of this organism in order to reconstruct past ocean nutrient changes. For scale, the spines radiating away from the shell are 1 to 1.5 millimeters long. (Photo courtesy of Howard Spero, University of California-Davis)

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