7971slopes (landforms)TTen-USVocabulário Colaborativo em Artes e Arquitetura active approved slopes (landforms)Deviations from the horizontal or perpendicular, particularly stretches of rising or falling ground, including any portion of the earth's surface marked by a gradual ascent or descent, whether natural or artificial.

Source: Art and Architecture Thesaurus
http://vocab.getty.edu/page/aat/300132356 

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