Bibliography used in the subject "The hydrosphere" of Biology and Geology 1º ESO

• (s.f.). Retrieved July 23, 2016, from http://e-ducativa.catedu.es/44700165/aula/archivos/repositorio//500/513/html/Unidad_03/pagina_2.html
• Water. (2018, August 29). Wikipedia, The Free Encyclopedia. Access date: 11:36, August 30, 2018 from https://es.wikipedia.org/w/index.php?title=Agua&oldid=110267719 .
• Underground water. (2018, July 10). Wikipedia, The Free Encyclopedia. Access date: 18:33, July 16, 2018 from https://es.wikipedia.org/w/index.php?title=Agua_subterr%C3%A1nea&oldid=109192962.
• DLG SClB, (03/22/2017). Water consumption in Zaragoza is 26% lower than the national average. The Newspaper of Aragon. Retrieved from http://www.elperiodicodearagon.com/noticias/aragon/consumo-agua-zaragoza-es-26-inferior-media-nacional_1189702.html
• The hydrosphere. (s.f.). Retrieved July 23, 2016, from http://recursostic.educacion.es/secundaria/edad/1esobiologia/1quincena6/index_1quincena6.htm
• Ocean. (2018, June 27). Wikipedia, The Free Encyclopedia. Consultation date: 17:34, July 16, 2018 from https://es.wikipedia.org/w/index.php?title=Oc%C3%A9ano&oldid=108958430.
• Origin of water on Earth. (2012, March 8). Encyclopedia, From the Universal Free Encyclopedia in Spanish. Retrieved August 29, 10:10, 2018 at http://enciclopedia.us.es/index.php?title=Origen_del_agua_en_la_Tierra&oldid=570067.
• Biosphere Project. (s.f.). Retrieved July 23, 2016, from http://recursos.cnice.mec.es/biosfera/alumno/1ESO/hidrosfe/index.htm
• Saline. (2020, January 26). Wikipedia, The Free Encyclopedia. Access date: 07:40, March 15, 2020 from  https://es.wikipedia.org/w/index.php?title=Salina&oldid=123067483.