Lake Vortsjarv (IMAGE) U.S. National Science Foundation Caption Ice was on Lake Vortsjarv in Estonia. Ice-covered lakes warm faster than those with open water. Credit T.Noges 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.