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Jack Oliver is credited with providing seismologic evidence supporting plate tectonics which encompassed and superseded continental drift with the article "Seismology and the New Global Tectonics", published in 1968, using data collected from seismologic stations, including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
Drift: The Unmooring of American Military Power Drift: The Unmooring of American Military Power Drift: The Unmooring of American Military Power is a 2012 book by Rachel Maddow. Her first book, "Drift" explores the premise that the manner in which the United States goes to war has gradually become more secretive and less democratic. In "Drift", Maddow examines how American declarations of war have incrementally shifted from being congressionally approved to being centralized in the hands of the American president. The book's scope spans from the Vietnam War to the wars in Iraq and Afghanistan. Maddow has said that she wrote "Drift" because the topic deserved a