Spanish Abstract: Este articulo se plantea el uso de unidades didacticas en Ciencias Naturales para potenciar el desarrollo de las competencias cientificas en la utilizacion del lenguaje cientifico, explicacion de fenomenos e indagacion, establecidas para el grado cuarto de basica primaria en la I. E. Marco Fidel Suarez de Medellin (sede Cuarta Brigada). Se trata de un informe de caso en el que se aplico una preprueba y una postprueba, en los momentos respectivos del proceso de ensenanza-aprendizaje. Se incluyeron recursos educativos digitales, como blogs, videos y juegos interactivos, que aumentaron la motivacion de los estudiantes para atender los procesos educativos de sus competencias cientificas; ademas, tuvieron la posibilidad de aumentar sus capacidades y deseos de investigar, de aprender de la interrelacion entre los seres vivos, desarrollar curiosidad por la exploracion y el analisis de los fenomenos naturales y proponer alternativas que ayuden a mejorar sus condiciones actuales de vida y de su entorno. English Abstract: This article proposes the use of teaching units in Natural Sciences to promote the development of scientific competencies in the use of scientific language, explanation of phenomena, and inquiry, as established for the fourth grade of elementary school in the E. E. Marco Fidel Suarez in Medellin (in the vicinity of the Cuarta Brigada headquarters). It is a case report in which a pre-test and a post-test were applied at the respective moments of the teaching-learning process. Digital educational resources were included, such as blogs, videos and interactive games, which increased the motivation of students to deal with the educational processes of their scientific competences.; in addition, they were given the chance to increase their capacities and desire to investigate, to learn from the interrelationship between the living beings, to develop curiosity for the exploration and analysis of natural phenomena, and to propose alternatives that help improve both their current living conditions and their environment.