Lithosphere & Asthenosphere
The tectonic plates are made up of Earth’s crust and the mantle. The crust and the upper mantle are called the lithosphere. The lithosphere is broken into puzzle pieces called 'Tectonic plates'. These puzzle pieces slowly moving around. They slide on top of the mantle called the Asthenosphere. When this occurs, an Earthquake happens!
http://www.windows2universe.org/earth/images/earths_crust_gif_image.html
http://www.windows2universe.org/earth/images/earths_crust_gif_image.html