Continental drift plate tectonics theory. In particular, the English geologist Arthur Holmes proposed in 1920 that plate junctions might lie beneath the sea, and in 1928 that convection currents within the mantle might be the driving force. Holmes' views were particularly influential: in his bestselling textbook, "Principles of Physical Geology," he included a chapter on continental drift, proposing that Earth's mantle contained convection cells which dissipated radioactive heat and moved the crust at the surface. Holmes' proposal resolved the phase disequilibrium objection (the underlying fluid was kept from solidifying by radioactive heating from the core). However, scientific communication in the '30 and
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