1. The surface of the earth is called the crust. It is made up of broken pieces scientists called plates.
2. These plates can collide with each other. When they move past one another, an earthquake happens at a plate boundary.
With a whole bunch of plate data, we were able to see that plates...
a. Move in different directions.
b. Are different sizes.
c. Move at different speeds!
This opened up a WHOLE BUNCH of new questions, focused on plates!