Tree Rings (IMAGE) Johannes Gutenberg Universitaet Mainz Caption Tree rings reveal much more than the age of a tree. For example, they allow conclusions to be drawn about the respective growing conditions and thus enable indirect climatic insight. Credit photo/©: Jan Esper Usage Restrictions This image may only be used in connection with the press release "Eruption of the Laacher See volcano redated", issued by Johannes Gutenberg University Mainz on July 1, 2021. 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.