materia y energía
http://www.bbc.co.uk/bitesize/ks2/science/materials/material_properties/read/2/
https://www.youtube.com/watch?v=sp2KB-UMpNM
http://agrega.educa.madrid.org/visualizar/es/es_2008070113_0320400/false
http://www.bbc.co.uk/bitesize/ks2/science/materials/material_properties/read/2/
https://www.youtube.com/watch?v=sp2KB-UMpNM
http://agrega.educa.madrid.org/visualizar/es/es_2008070113_0320400/false
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