Plastic bottle (IMAGE) University of Rhode Island Caption Littering of single-use plastic items is one source of microplastic pollution. Most microplastics are eventually deposited on shorelines and in marine sediment. Credit Mike Salerno URI Usage Restrictions n/a 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.