Various Concentrations (IMAGE) University of Washington Caption The concentration of dissolved iron, manganese and aluminum were measured during the voyage. The bottom panel shows helium, which is a nonreactive element that marks the water as coming from a hydrothermal vent. Credit J. Resing / Univ. of Washington Usage Restrictions With credit 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.