Documentales sobre la formación de la Tierra link: http://www.youtube.com/watch?v=-1J5KPKF1jc link: http://www.youtube.com/watch?v=FgdBE127FCQ link: http://www.youtube.com/watch?v=B-m1gx0s0Ro link: http://www.youtube.com/watch?v=EBOkGw2XMs8
link: http://www.youtube.com/watch?v=-1J5KPKF1jc link: http://www.youtube.com/watch?v=FgdBE127FCQ link: http://www.youtube.com/watch?v=B-m1gx0s0Ro link: http://www.youtube.com/watch?v=EBOkGw2XMs8