Bibliography used in the Topic "The internal geological activity of the Earth" and student work

• Biology and Geology 3 ^or ESO. (s. f.). Retrieved April 22, 2013, from http://recursostic.educacion.es/secundaria/edad/3esobiologia/
• Geothermal gradient. (2020, January 29). Wikipedia, The Free Encyclopedia . Consultation date: 11:16, February 15, 2020 from  https://es.wikipedia.org/w/index.php?title=Gradiente_geot%C3%A9rmico&oldid=123145112.
• The external geological activity of the planet. (s. f.). Retrieved June 27, 2013, from http://recursostic.educacion.es/secundaria/edad/3esobiologia/3quincena1/index_3quincena1.htm
• Biosphere Project. (s. f.). Retrieved April 22, 2013, from http://recursostic.educacion.es/ciencias/biosfera/web/index.htm
• Tectonic plates. (2017, August 7). Wikipedia, The Free Encyclopedia. Consultation date: 21:52, August 27, 2017 from https://es.wikipedia.org/w/index.php?title=Tect%C3%B3nica_de_placas&oldid=100977287 .
• Earthquake. (2017, August 25). Wikipedia, The Free Encyclopedia. Consultation date: 11:23, August 28, 2017 from https://es.wikipedia.org/w/index.php?title=Terremoto&oldid=101381607.
• Volcano. (2017, August 27). Wikipedia, The Free Encyclopedia. Consultation date: 05:39, August 28, 2017 from https://es.wikipedia.org/w/index.php?title=Volc%C3%A1n&oldid=101458911.
• (s. f.). Retrieved April 21, 2013, from http://e-ducativa.catedu.es/44700165/aula/archivos/repositorio//500/528/html/Unidad_06/index.html