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September 3, 2009
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How a wobble in the Earth's axis of rotation caused a cooling trend lasting at least 1,900 years.
How a wobble in the Earth's axis of rotation caused a cooling trend that lasted at least 1,900 years.
Credit: Zina Deretsky, 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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