The 365 Days of Astronomy Astronomy Cast Ep. 142: Plate Tectonics
http://www.astronomycast.com/archive/
From June 15, 2009.
The surface of the Earth feels solid under your feet, but you're actually standing on a plate of the Earth's crust. And that plate is slowly shifting across the surface of the Earth. Over geologic timescales, plate tectonics has totally resurfaced our planet, bringing continents together, and tearing them apart. We know we have plate tectonics here on Earth, but what about other worlds in the solar system?
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