earthquakes

3. The process where saturated soil loses strength and behaves like a liquid during shaking.
4. smaller earthquakes that follow the mainshock in the same area, which can occur days, months, or even years later.
7. moving perpendicular to wave direction.
9. , Travel along the Earth's surface, causing the most ground movement.
10. a layer of earth
11. waves, seismic waves that travel though the earth

1. scale, a scale that rates the intensity of an earthquake
2. the shifting of plate tectonics
5. the study of earthquakes
6. compressing and expanding material in the direction of travel.
8. Plates, Massive sections of the Earth's lithosphere that move and interact at boundaries, causing earthquakes.