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       xkcd - A Webcomic - Mantle Model (3141)
        
       Image:
 (PNG) mantle_model.png
        
       Mantle plumes explain Hawaii, Yellowstone, Iceland, the East
       African Rift, the Adirondack uplift, the Permian extinction, the
       decline of Rome, the DB Cooper hijacking, and the balrog in
       Moria. Those little hills of sand in your yard are caused by
       antle plumes.
        
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