This is a file from the Wikimedia Commons. The description on its description page there is copied below.
Age of oceanic crust. (See also Image:Earth seafloor crust age poster.gif)
Source: Excerpted from http://www.ngdc.noaa.gov/mgg/image/crustageposter.gif ; original upload in english wikipedia 31 March 2005 by en:User:SEWilco
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