Cold-water geyser (IMAGE) University of Münster Caption The cold-water geyser near Andernach, on the Rhine (in Germany), occurs because carbon dioxide rises up from inside the Earth. It is at such places inside the Earth that researchers want to find microorganisms which prefer, or even need, extremely high concentrations of carbon dioxide. Credit Sophie Simon, University of Duisburg-Essen Usage Restrictions The use of the photo is only permitted in connection with this press release and by indicating the source. 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.