Cratons are anomalously-strong regions of the continents that have largely resisted tectonic forces for billions of years. How such strong zones could be forged in a hot, low-viscosity, low stress, early-Earth has been a long-standing puzzle for geologists. Adam Beall, Katie Cooper and Louis Moresi have recently proposed that cratons were made by the catastrophic switching on of plate tectonics.

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O n February 1, 2015, the global information and analytics corporation Elsevier and the National Autonomous University of Mexico (UNAM) established the agreement UNAM-Elsevier contract DGAJ-DPI-39-081114- 241, which saw the transfer from UNAM to Elsevier for the “production and hosting, advertising and support” of 44 Mexican open access academic journals published by UNAM.

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Modelling the relative time-scales of the Rayleigh-Taylor Instability and delamination, using Underworld Why model sub-continental gravitational instabilities? Within the plate tectonics framework, continents are generally considered to have a much lower density than the asthenosphere below and therefore avoid the kind of recycling that the oceanic crust and lithosphere undergoes.

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