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Convection Currents - driving forces of plate tectonics - very hot material at the deepest part of the mantle rises, then cools and sinks again, then repeating. - ppt download
![A Shift to Plate Tectonics | The Emergence and Evolution of Plate Tectonics - University of Illinois at Urbana-Champaign A Shift to Plate Tectonics | The Emergence and Evolution of Plate Tectonics - University of Illinois at Urbana-Champaign](http://publish.illinois.edu/platetectonics/files/2014/12/mantle.jpg)
A Shift to Plate Tectonics | The Emergence and Evolution of Plate Tectonics - University of Illinois at Urbana-Champaign
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