Furlan, T. and Santil, F.L. de P. 2021. The units of terrestrial relief as abstract components of nature in the teaching of school Geography: a look under the textbook. Boletim de Geografia. 38, 3 (Jul. 2021), 162-180. DOI:https://doi.org/10.4025/bolgeogr.v38i3.57977.