Multimedia Gallery
April 22, 2015
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.
An ice core from the West Antarctic Ice Sheet Divide project.
An ice core from the West Antarctic Ice Sheet Divide project. The dark band is a layer of volcanic ash that settled on the ice sheet approximately 21,000 years ago.
Credit: Heidi Roop, NSF
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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Related story: Antarctic ice core reveals how sudden climate changes in North Atlantic moved south