MAURO FERMARIELLO / SCIENCE PHOTO LIBRARY MAURO FERMARIELLO / SCIENCE PHOTO LIBRARY
Measuring volcanic gas. Vulcanologists measuring levels of carbon dioxide (CO2) near the ground on the slope of a volcano. Most of the gas emitted by volcanoes is CO2. They are using an accumulation chamber (centre). Photographed at the Solfatara volcano, Campi Flegrei, Italy.
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