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       xkcd - A Webcomic - Earth Layers (2840)
        
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       earth_layers.png
        
       The Earth's magnetic field is primarily generated by currents in
       the liquid outer core, though some geophysicists argue that an
       unexplained mismatch with models suggests that the Kinder toy
       contains a magnet.
        
       Comics reproduced from www.xkcd.com under license.
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