Glacial Meltwaters Carrying Silica (IMAGE) University of Bristol Caption Glacial meltwaters carrying silica with a distinctive isotopic signature flow into marine ecosystems, where microscopic algae known as diatoms use the silica to build their glassy cell walls. Credit Dr Jon Hawkings, University of Bristol Usage Restrictions Image is for single use only to illustrate this press release and must not be archived. 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.