Answer the following questions. When you are finished click submit.

1. Describe the three compositional layers of Earth.

2. How is the lithosphere different then the astenoshpere and why are these differences important to life?

3. What is a 'shadow zone' and why does it exist?

4. How was the Moho boundary discovered?

5. List and describe the five layers of Earth's interior defined by their physical properties.

6. Why does Earth have a magnetic field?

7. Explain the effect density has on p-wave velocity.

8. What is the geothermal gradient?