A group of people with instruments are seen from far above, their long shadows extending toward the top left of the image. Around them are various types of terrain, from a dry looking expanse of tan soil with white areas to richer looking reddish soil with green objects that appear to be plants.

Dear Eos:

In March 2023, as part of the European Research Council Starting Grant awarded to Donato Giovannelli, a team of 11 scientists from six institutions and diverse disciplines traveled across the Puna plateau in northern Argentina to sample gases, fluids, and sediments from geothermal systems to better understand the interactions between the geosphere and biosphere.

At 8:00 in the morning, our team of scientists is already busy sampling the hydrothermal springs at the top of a large travertine mound at an elevation of 4,130 meters near the Granada complex.

—Donato Giovannelli, University of Naples, Naples, Italy

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