Continental drift is created at spreading centers, and this, along with subduction, drives the system of plates in a chaotic manner, resulting in continuous orogeny and areas of isostatic imbalance. The theory of plate tectonics explains all this, including the movement of the continents, better than Wegener's theory. Hans Stille and Leopold Kober opposed the idea of continental drift and worked on a "fixist" geosyncline model with Earth contraction playing a key role in the formation of orogens. Other geologists who opposed continental drift were Bailey Willis, Charles Schuchert, Rollin Chamberlin and Walther Bucher. In 1939 an international geological conference was held
International Society for the Interdisciplinary Study of Symmetry on 2013, planned to take place every two years. This series is co-organised with the Research Group on Universal Logic: The Society is governed by a number of special Boards and Committees. The President of the International Society for the Interdisciplinary Study of Symmetry is Dénes Nagy. Among the Honorary Members of the Society are: Honorary Members of the Society (passed away) International Society for the Interdisciplinary Study of Symmetry The International Symmetry Society ("International Society for the Interdisciplinary Study of Symmetry", abbreviated name SIS) is a non-profit organization registered in Hungary (Budapest, Vármegye u. 7. II. 3., H-1052). Its