Plate Tectonics. Quicktime versionAVI version Animated gifs Last 750 million years: [1.04 MB] [506 KB] [261 KB]
Tectonic Plates. The edges of these plates, where they move against each other, are sites of intense geologic activity, such as earthquakes, volcanoes, and mountain building.
Plate tectonics is a relatively new theory and it wasn't until the 1960's that Geologists, with the help of ocean surveys, began to understand what goes on beneath our feet. Where is the Evidence for Plate Tectonics? International Tsunami Information Center. BGS Earthquake Seismology. Search results - VolcanoDiscovery.