Plate Tectonics

3. The exterior portion of the earth that lies above the mantle.
5. A very large ocean wave caused by an underwater earthquake or volcanic eruption
8. Boundary two plates slide against each other in a sideways motion
12. The point of the earth's surface directly above the focus of an earthquake.
13. Boundary A tectonic boundary where two plates are moving away from each other and new crust is forming from magma that rises to the Earth's surface between the two plates
16. A zone of the earth's mantle that lies beneath the lithosphere
17. The layer of the earth between the crust and the core.

1. A fracture in the continuity of a rock formation caused by a shifting or dislodging of the earth's crust
2. Wave A type of seismic body wave in which rock particles vibrate parallel to the direction of wave travel.
4. wave A seismic wave that travels across the surface of the Earth as opposed to through it
6. Boundary A tectonic boundary where two plates are moving toward each other.
7. An opening in the earth's crust through which molten lava, ash, and gases are ejected
9. The point of origin of an earthquake
10. Wave An earthquake wave in which rock particles vibrate at right angles to the direction of wave travel
11. The outer part of the earth, consisting of the crust and upper mantle
14. a sudden and violent shaking of the ground, sometimes causing great destruction, as a result of movements within the earth's crust or volcanic action.
15. An instrument for automatically detecting and recording the intensity, direction, and duration of a movement of the ground, especially of an earthquake.