What Is Marine Snow? (VIDEO) University of Sydney This video is under embargo. Please login to access this video. Caption A short explainer video about the role of marine snow in forming undersea carbonate structures that act as the Earth's largest carbon sinks. Credit Vanessa Saines/University of Sydney Usage Restrictions None 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.