Geología: Placas Tectonicas

 
video Video: Exploring the Earth (10 min)   --  Includes explanations of continental drift, sea floor spreading and plate tectonics.
video Video: Inside our Planet (7 min)   --  Includes descriptions of the layers inside earth and how scientists have studied them.
video Video: Magentic Field Reversal (3 min)   --  Describes evidence in the rocks that the magnetic poles of the Earth have reversed.
 

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