http://www.skoool.es/content/los/chemistry/water_change_state/launch.html
http://www.actiludis.com/wp-content/uploads/2009/03/ciclodelagua_infa002.swf
http://www.aguasdesevilla.com/infantil/infan/ciclome.html
http://www.juntadeandalucia.es/averroes/ceip_san_rafael/AGUA/index.html
http://www.educa.madrid.org/cms_tools/files/729f5c31-f157-4f4b-829c-5548f413f0d7/yagua000.swf