Multimedia Gallery
January 31, 2008
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Ice cover on northern lakes across the United States has formed later each winter.
Ice cover on lakes around Madison, Wis., and throughout the northern United States has formed later each winter.
Credit: Peter W. Schmitz, Madison, Wis.
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: Winter Ice on Lakes, Rivers, Ponds: A Thing of the Past?