Plate Tectonics

We had another astounding talk this evening at the astronomy club.  Dan Davis, a professor from Stony Brook University, and chair of the Geology department came to talk about plate tectonics on both the Earth, and on other planets and moons in the solar system.  "Plate Tectonics" are large-scale motion of large plates and the movements of the Earth's crust, over the last hundreds of millions of years.  He is demonstrating with his hands  the process where one part of the crust rises up over another part of the crust, which is forced downwards. It is called "Subduction."  Aren't you glad at all that you can learn by reading the blog?