Continental drift Permian era but failing to account for glaciation in India, Australia and South Africa. Geophysicist Jack Oliver is credited with providing seismologic evidence supporting plate tectonics which encompassed and superseded continental drift with the article "Seismology and the New Global Tectonics", published in 1968, using data collected from seismologic stations, including those he set up in the South Pacific. It is now known that there are two kinds of crust: continental crust and oceanic crust. Continental crust is inherently lighter and its composition is different from oceanic crust, but both kinds reside above a much deeper "plastic" mantle. Oceanic crust
Center for the Study of Democracy (Bulgaria) Center for the Study of Democracy (Bulgaria) This article is about the Center for the Study of Democracy in Bulgaria For the other institution by the same name, in the United States, see the Center for the Study of Democracy at St. Mary's College of Maryland, USA. Founded in late 1989, the Center for the Study of Democracy (CSD) is an interdisciplinary public policy institute dedicated to the values of democracy and market economics, based in Bulgaria. The CSD is a non-partisan, independent organization fostering the reform process in Bulgaria through impact on policy and civil society, and is one