jueves, 20 de marzo de 2014

100 Greatest Discoveries: Earth's Magnetic Field

                                                                                 
                                                                             
             http://science.howstuffworks.com/environmental/29266-100-greatest-discoveries-the-center-of-the-earth-video.htm         
                                                                             
                                Extraído de la red.
                                                                             


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