Full Screen / Esc Printer-friendly Version Interactive Discussion large thermally driven "roller" convection cells previously inferred as the driving mechanism in earlier interpretations of continental drift and plate tectonics, have not been active in the Earth's mantle the past 42 Million years, if ever. This report also presents estimates of the changes in location and magnitude of the Earth's axis of total plate tectonic angular momentum for the past 62 million years. eED 4, 21-53, 2009 Plate tectonics conserves angular momentum
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