1. Section 3 Theory of plate tectonics

2. Plate tectonics  The theory that the Earth’s lithosphere is divided into tectonic plates that move around on top of the asthenosphere.

3. Convergent boundary  When to tectonic plates push into one another.

4. Divergent boundary When two tectonic plates move away from one another.

5. Transform boundary When two tectonic plates slide past each other

6. Section 4 Deforming the Earth’s Crust

7. Stress is the amount of force per unit area

8. Compression  The type of stress that occurs when an object is squeezed

9. Tension  Is stress that occurs when forces act to stretch an object

10. Folding  Occurs when rock layers bend due to stress in the Earth’s crust

11. Fault  A break in the Earth’s crust along which blocks of the crust slide relative to one another due to tectonic forces

12. Normal fault  A fault in which the hanging wall moves down relative to the footwall

13. Reverse fault  A fault in which the hanging wall moves up relative to the footwall

14. Strike-slip Fault  Occurs when opposing forces cause rock to break and move horizontally