Multimedia Gallery
April 18, 2013
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Examination of lake sediment core from southern Alaska shows environmental and climate change.
Examination of lake sediment core from southern Alaska shows intricate layering indicating environmental and climatic changes over centuries.
Credit: Darrell S. Kaufman, Northern Arizona University
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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