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Jack Oliver is credited with providing seismologic evidence supporting plate tectonics which encompassed and superseded continental drift with the article "Seismology and the New Global Tectonics", published in 1968, using data collected from seismologic stations, including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
Institute for the Study of the Americas Institute for the Study of the Americas The Institute for the Study of the Americas (ISA) was established in 2004 following a merger of the Institute of Latin American Studies and the Institute of United States Studies. ISA formed part of the University of London’s School of Advanced Study along with nine other research institutes. In 2013, the Institute of Latin American Studies was re-established in order to focus the support provided to scholars of Latin America. Activities pertaining to the study of the United States continue within the School of Advanced Study under the direction of the Institute of