Plate Tectonics

2. /a large volcanic crater
4. /also called P wave
5. /a numerical scale expressing the magnitude of an earthquake on the basis of seismograph oscillations
6. /An example of Transformation Fault Boundary
8. /a type of seismic wave
12. /mark sites of convection downwelling of Earth's lithosphere
14. /is the belt or zone of the continental lithosphere where the extensional deformation is occurring
17. /A type of volcano
18. /also called S wave
19. /is an isolated region of the earth that produces lava
20. /a sudden and violent shaking of the ground, as a result of movement

1. /the crust that takes place in the ocean
3. /Also known as Seafoor Spreading
7. /is directly below the epicenter in the earthquake
9. /the point on the earth's surface vertically above the focus of an earthquake
10. /a destructive mudflow on the slopes of a volcano
11. /a fracture along which the blocks of crust on either side have moved to one another parallel to the fracture
13. /a geophysicist who studies earthquakes
15. /a smaller earthquake following the main shock of a large earthquake
16. /a mild tremor preceding the violent shaking movement of an earthquake