The earth's crust is divided into seven tectonic plates, which meet at fault lines. The plates are constantly in motion, driven into each other by the heat generated in the earth's core.
The earth's crust is divided into seven tectonic plates, which meet at fault lines. The plates are constantly in motion, driven into each other by the heat generated in the earth's core.
General Note
Originally released by BBC Worldwide Learning, 2010.
Streaming video file encoded with permission for digital streaming by Infobase on April 18, 2015.