Continental drift Continental drift Continental drift is the theory that the Earth's continents have moved over geologic time relative to each other, thus appearing to have "drifted" across the ocean bed. The speculation that continents might have 'drifted' was first put forward by Abraham Ortelius in 1596. The concept was independently and more fully developed by Alfred Wegener in 1912, but his theory was rejected by many for lack of any motive mechanism. Arthur Holmes later proposed mantle convection for that mechanism. The idea of continental drift has since been subsumed by the theory of plate tectonics, which explains that the continents
The Defence of Duffer's Drift was written by Albert J. Marckwardt and Michael Burgoyne. The book follows a young lieutenant through successive lessons while conducting stability and counterinsurgency operations in Iraq. The winter 2005 edition of the "Canadian Army Journal" contained the following praise: Paul Hoffman, in his sequel to The Left Hand of God, The Last Four Things, used the example of Duffer's Drift by name as an exercise for Thomas Cale to solve for a defensive position for The Redeemers against the more mobile Commandos of the Folk. The problem set for Cale is to discover how to defend such a position with