Geochemists explore the chemistry of the natural world. Geologist Ryan Venturelli studies sediment under Antarctica’s ice sheets and glaciers, analyzing what it tells us about changes since the last ice age. Her work helps improve the data that helps climatologists model changes in Earth’s cryosphere. Earth System Scientist Noel Gurwick examines the ways that runoff from the fertilizer farmers use to improve the soil they grow plants in affects nearby bodies of water.