1. Earth can be divided into layers two ways. Sketch and label the layers of the earth based on chemical properties, and based on physical/mechanical properties.

2. Sketch the three main types of plate boundaries. Label their relative motion to each other and indicate the type of stress that causes each type of boundary.

3. Sketch or describe the three types of convergent plate boundaries. What is the product of the convergence at each type of convergent boundary?

4. What are the three types of seismic waves? Describe their characteristics

5. What is a discontinuity? What are the two discontinuities in Earth, and what happens to P and S waves at these discontinuities?