Continents move on upper mantle {continental drift}|. Upper-mantle asthenosphere and possibly all mantle has stable constant one-inch-per-year convection currents, caused by heat. Currents provide energy to move continents. Continents have been drifting for last 2,000,000,000 years. Six major and many minor crustal plates float on upper mantle.
Physical Sciences>Earth Science>Planet>Plate Tectonics>Theories
5-Earth Science-Planet-Plate Tectonics-Theories
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Date Modified: 2022.0224