Glacial Meltwaters (IMAGE) University of Bristol Caption Vast quantities of milky glacial meltwaters sourced from Greenland Ice Sheet make their way toward the ocean. The milky colour of meltwaters is caused by the large quantities of finely ground rock flour carried by the meltwater. 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.