Abstract The Federal University of Goiás (UFG) and the University of Brasília (UnB), in partnership with the company Eletrobras Furnas, have developed research and, based on this, extension projects aimed at education in a broad sense, in which they seek to disseminate and popularise technical-scientific knowledge. This paper aims to present and evaluate educational actions carried out in the area of soil science and geotechnics applied to engineering, geography, and the environment. To do so, the educational experiences developed within the scope of two extension projects are shared. Besides that, the relevance of publishing books and primer, with language adapted to lay society, within the scope of research projects, is analysed. The results collected regarding the effectiveness of the extension actions as a tool for learning point to a positive evaluation by the students. Furthermore, social networks are an important tool for scientific dissemination and have the potential to disseminate knowledge more widely than in a classroom course. By comparing the number of citations in Google Scholar of the books and booklets with the papers arising from these projects, one can observe the reach of this type of publication, although its purpose is the popularisation of science, with reach in places not considered in the technical-scientific publication metrics. Finally, for effective scientific development, it is necessary to have public policies, effective interaction between universities, research centres and schools, and the participation of professional associations, funding and evaluation agencies, Education Departments and the Ministry of Education, Science, Technology, and Innovation. UFG (UFG UnB, UnB , (UnB) Furnas sense technicalscientific technical engineering geography environment so shared that primer society analysed students Furthermore course metrics Finally development policies universities schools associations agencies Science Technology Innovation (UnB

ABSTRACT Soil education plays an important role in preventing soil degradation processes by raising awareness among the population about the importance of this non-renewable resource. Using new educational technologies in teaching, such as educational videos and social media, can speed up communication and information. This article aimed to develop educational videos on the topic of erosion, posted on social networks, as a way of popularizing science. Four videos of a maximum of 7 minutes were produced, which were shown in the classroom and on Instagram (@saberessobresolos). In-class promotion reached nine undergraduate and postgraduate classes, totaling an average of 255 students. Metrics used for evaluation were polls and video engagement on the social network. Instagram metrics results indicated, in a period of 49 days, 1615 profiles had accessed the video. There was a reduction in this engagement in other publications, probably due to the variation in time, day of the week, and frequency of posts. The results of the surveys were positive for all the characteristics evaluated, with little disparity among the videos. On a smaller scale, negative feedback was observed, such as: the narration, running time, the translation into Brazilian Sign Language (Libras), and video captions. Approximately 81 % of individuals reported experiencing soil erosion effects, and 59 % had encountered issues as a direct consequence. The evaluation also indicated the videos’ ability to enhance knowledge is above 90 %, largely due to the dynamic and inclusive nature of this pedagogical approach, fostering genuine comprehension of the content, satisfaction in learning, and the ability to engage in meaningful discussions on the subject. Disseminating educational videos through social media ensured the democratization and widespread access to soil education, as it expanded reach and facilitated the exchange of knowledge between universities and society. The project fulfills its mission of producing and popularizing knowledge on soils, expanding scientific dissemination, making it more accessible, and contributing to recognizing the importance of conserving this resource. nonrenewable non renewable resource teaching information networks science produced @saberessobresolos. saberessobresolos @saberessobresolos . (@saberessobresolos) Inclass In class classes 25 students network 4 days 161 publications time week posts evaluated scale observed narration Libras, Libras , (Libras) captions 8 effects 5 consequence 9 approach content learning subject society soils dissemination accessible (@saberessobresolos 2 16 (Libras 1

Abstract Every year, millions of tons of phosphogypsum, a by-product of the fertilizer industry, are produced worldwide. As just a small part of this amount is reused, this study analyzed a new alternative to reuse this material in geotechnical works, in mixtures with lateritic soil and bentonite for the construction of liners for sanitary landfills. Four compositions were tested: 100% soil, 10% phosphogypsum + 90% soil, 10% phosphogypsum + 3% bentonite + 87% soil and 10% phosphogypsum + 6% bentonite + 84% soil. X-ray diffraction and scanning electron microscopy were used to analyze the mineralogy, while the hydromechanical performance was evaluated through compaction, hydraulic conductivity, and unconfined compressive tests. Modified free swell tests and modified Atterberg limits were used to test compatibility with NaCl, NaOH and ethanol. A solubilization test was carried out to investigate the presence of inorganic contaminants in the phosphogypsum. The addition of phosphogypsum increased the optimum water content in the compaction curves, did not change the hydraulic conductivity and decreased the unconfined compressive strength of the mixtures. The addition of bentonite increased the optimum water content, reduced the hydraulic conductivity, and increased the unconfined compressive strength. The possibility of dissolution of gypsite (main component of phosphogypsum), the problems that may arise from the interaction with chemical products, and the risk of manganese release in the subsoil lead to the conclusion that phosphogypsum is not suitable to be used in liners. However, soil-bentonite-phosphogypsum mixtures were considered eligible materials to be used in impermeable layers of other geotechnical works. year byproduct by product industry worldwide reused works landfills tested 100 10 90 3 87 6 84 Xray X ray mineralogy NaCl ethanol curves main , phosphogypsum) products However soilbentonitephosphogypsum 1 9 8