Beach glass with barnacles (IMAGE) University of Washington Caption This piece of glass covered in barnacles was collected in the “wrack zone,” the high tide line where kelp accumulates, at Puget Sound’s Illahee Beach in 2019. Volunteers’ beach surveys confirm that litter tends to accumulate on this part of the beach. Credit COASST Usage Restrictions With credit 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.