Eighth graders describe how stress builds up in the Earth's crust by the movement of tectonic plates. In groups, they relate the three types of stresses to the types of plate movements and explain how the stress causes faults to form. ...

Eighth graders examine the forces that are constantly acting on the Earth. They describe the theory of tectonic plates and demonstrate the two kinds of earthquake waves. They also examine the role of volcanoes in the structure of the...

Students discover the faults throughout the Earth. They describe the different types of faults and how they are related to earthquakes. They build models of the faults.