Team Arrival (IMAGE) University of South Florida Caption Surprising results from historic study suggest the shrinking West Antarctic Ice Sheet, a major threat to global sea level rise, was smaller and more dynamic in recent geologic past than previously thought. Credit Ryan Venturelli Usage Restrictions NA License Original 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.