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February 27, 2013
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Rock in an Icelandic hot spring near Reykjavik with sulfur and Galdieria sulphuraria.
Rock in an Icelandic hot spring near Reykjavik with sulfur and Galdieria sulphuraria.
Credit: Christine Oesterhelt
Images credited to the National Science Foundation, a federal agency, are in the public domain. The images were created by employees of the United States Government as part of their official duties or prepared by contractors as "works for hire" for NSF. You may freely use NSF-credited images and, at your discretion, credit NSF with a "Courtesy: National Science Foundation" notation.
Additional information about general usage can be found in Conditions.
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