Eroding Iceberg in the Weddell Sea (IMAGE) Monterey Bay Aquarium Research Institute Caption A five-year research project led by marine biologist Ken Smith at MBARI shows that icebergs such as this one carry iron-rich sediment from Antarctica out into the Southern Ocean. The darker parts of the ice contain higher concentrations of sediment. Credit Debbie Nail Meyer © 2009 MBARI Usage Restrictions No advertising use License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.