image: The Upsala Glacier in Patagonia where glacial dust samples were collected. When glaciers move across bedrock, they scrape against it (see glacial grooves in the foreground), and grind it into smaller particles. The turquoise blue water of the lake in the background is caused by the milkiness of the fine glacial dust suspended in it. This material relates to a paper that appeared in the June 23, 2017, issue of Science Advances, published by AAAS. The paper, by E.M. Shoenfelt at Columbia University in New York, N.Y., and colleagues was titled, "High particulate iron(II) content in glacially sourced dusts enhances productivity of a model diatom." view more
Credit: [Credit: Michael R. Kaplan]