Plate tectonics

2. Single large landmass made up of all the continents connected together that broke apart 200 million years ago.
3. Powerful seismic sea wave that can travel thousands of kilometers in all directions and that begins over an earthquake focus.
7. Point of Earth's surface directly above an earthquake's focus.
8. Earth's outermost layer.
9. The point beneath Earth's surface where energy release occurs, in a earthquake.
11. Waves that travel outward from an earthquake's focus and move through Earth by causing particles in rocks to vibrate at right angles to the direction of the wave.
12. Waves Energy waves that are produced at and travel outward from the earthquake's focus.
13. Waves of energy that reach Earth's surface during an earthquake, travel outward from the epicenter, and move rock particles up and down, and side to side.
16. Largest layer inside Earth, lying directly above the outer core.
17. Core Liquid core that surrounds Earth's solid inner core.
18. Device used by seismologists to record primary, secondary, surface waves from earthquake.

1. Surface along which rocks break and move.
2. Theory that Earth's crust and upper mantle are broken into sections that move around on a plastic-like layer of the mantle.
4. Waves that travel outward from an Earthquake's focus and cause particles in rocks to move back and forth in the same direction the wave is moving.
5. Core Earths innermost part.
6. Rigid, outermost layer of Earth that is about 100km thick, and is composed of the crust and part of the upper mantle.
10. A volcano formed by alternating layers of tephra and lava and that is found mostly where Earth's plates come together.
11. Scientist who studies earthquakes and seismic wave.
14. Large opening formed when the top of a volcano collapse.
15. Cone Steep-sided volcano made of loosely packed tephra.
19. A broad volcano with gently sloping sides.