Earthquakes, Volcanoes, and Plate Motions Today
Lecture no. 39 from the course: The Joy of Science
Taught by Professor Robert M. Hazen | 29 min | Categories: The Great Courses Plus Online Science Course
The mechanism of plate tectonics depends on the rigidity of rocks. The lithosphere, which includes the crust and the upper mantle, floats on the relatively soft, hot asthenosphere. The Earth's surface is divided into about a dozen lithospheric plates, with earthquakes and volcanoes clustered at their boundaries. How do geologists explain the presence of volcanism in mid-plate "hot spots"?