MAURO FERMARIELLO / SCIENCE PHOTO LIBRARY MAURO FERMARIELLO / SCIENCE PHOTO LIBRARY
Measuring volcanic temperature by a volcanic vent (or fumarole). Hand of a vulcanologist holding a digital thermometer used to measure ground temperature. By making these measurements, geologists can detect when periods of volcanic activity are beginning. Photographed at the Solfatara volcano, Campi Flegrei, Italy.
Model release not required. Property release not required.