1. SHAPING EARTH’S SURFACE
CHAPTER 4 LESSON 2
SHAPING EARTH’S SURFACE

2. 4.2 INFORMATION

3. NAT GEO: EARTHQUAKES 101

4. NG: UNDERSTANDING EARTHQUAKES

5. EARTHQUAKES
The vibration caused by the rupture and sudden movement of rocks along a break or a crack in Earth’s crust.

6. PLATES
Large pieces of crust that float on magma in the mantle.

7. EARTHQUAKES
An earthquake can occur at a fault.

8. FAULT
A crack or a fracture in Earth’s crust along which movement occurs.

9. BONE FRACTURES

10. FAULT
Because of the convection currents beneath tectonic plates …

11. FAULT
… forces build up along faults at plate boundaries.

12. FAULT RUPTURES
When a fault ruptures, Earth’s crust moves along the fault, causing an earthquake.

13. FAULT RUPTURES
Most earthquakes occur at plate boundaries

14. FOCUS
The point in the Earth where an Eartquake starts.

15. EPICENTER
The point on Earth’s surface directly above the focus.

16. SEISMIC WAVES
Waves that carry energy released by an earthquake.

17. MAGNITUDE
The size of an earthquake

18. The bigger the crack, the stronger the quake

19. MAGNITUDE
Magnitude is determined by how much energy is released during the earthquake.

20. FAULTS
A plate boundary involves more than one fault

21. FAULTS AND SUBDUCTION
Faults are largest where one plate subducts into the mantle …

22. FAULTS AND SUBDUCTION
… and the strongest and most damaging earthquakes occur there.

24. DR. BINOCS – EARTHQUAKE REVIEW

25. NG: SEATTLE QUAKE

26. JAPAN: BUILDING SWAY

27. EARTHQUAKE ON A BRIDGE