Multimedia Gallery
September 3, 2009
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Glacial history helps scientists reconstruct past climates.
The previous extent of a glacier that feeds Upper Greyling Lake in south-central Alaska is marked by the sharp-crested ridges of debris (lateral moraines) that descend into the lake. Glacial history is combined with other evidence, such as lake-core evidence, to reconstruct climate history.
Credit: Darrell 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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