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         This is a file from the  Wikimedia Commons. The description on its  description page there is shown below. | 
        
        
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 Summary
       
        
         | Description | 
         
           Landsat image of sand dunes advancing on Nouakchott, the capital of Mauritania.  | 
        
        
         | Source | 
         
           
            http://exploration.nasa.gov/articles/06dec_dunes.html  | 
        
        
         | Date | 
         
           not specified  | 
        
        
         | Author | 
         
           NASA  | 
        
        
         | Permission | 
         
           US Government, public domain  | 
        
       
       
 Licensing
       
        
         
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         This file is in the  public domain because it was created by  NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". ( NASA copyright policy page or  JPL Image Use Policy). Warnings: 
           - Use of  NASA logos (which include the current "meatball" logo, the old "worm" logo, and the seal) is restricted.
 - The NASA website hosts a large number of images from the  Soviet/ Russian space agency, and other non-American space agencies. These are not in the public domain.
 - Materials from the  Hubble Space Telescope may be copyrighted if they do not explicitly come from the  STScI. 
 - All materials created by the  SOHO probe are copyrighted and require permission for commercial non-educational use. 
 - Images featured on the  Astronomy Picture of the Day (APOD) web site may be copyrighted. 
  
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      File links
      
       
The following pages on the English Wikipedia link to this file (pages on other projects are not listed):
      
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         Desertification
 - Nouakchott
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         User:Andrea and Max's Bio Project