The factors of Slavic and Turkic languages typological complementary in the light of systemic linguistics and ethnology

Relying on the achievements of system linguistics and ethnology, the authors of the article, referring to the history of Nostratic languages, discuss the reasons for the typological divergence of originally related languages and the typological stability of the Slavic and Turkic languages. Recognition of landscape and climatic conditions as determining in the development of language and ethnos, identification of interrelations between functions and the structure of the system methodologically bring together system linguistics and ethnology, allowing to explain the cause of historical changes in the system and to predict the vector of its further development