Across
- 3. An opening at the surface of the Earth through which volcanic material passes.
- 6. An instrument that records vibrations in the ground and determines the location and strength of an earthquake.
- 7. A seismic wave that causes particles of rock to move in a side-to-side direction.
- 9. The point on Earth’s surface directly above an earthquake’s starting point, focus
- 10. The study of Earthquakes
- 12. A vent or fissure in the Earth’s surface through which magma and gases are expelled
- 14. Volcano formed from ash, cinder, and other volcanic debris.
- 16. A geologic hazard in which molten rock- called magma or lava- gases, ash, and other material are released onto Earth’s surface and into the atmosphere.
- 17. Tectonics The theory that explains how large pieces of Earth’s outermost layer called tectonic plates move and change shape.
Down
- 1. Waves A wave of energy that travels through the Earth, away from an earthquake in all directions.
- 2. The point along a fault at which the first motion of an earthquake occurs
- 4. A seismic wave that causes particles of rock to move in a back and forth direction.
- 5. The steep, hollowed-out area surrounding a vent at the top of a volcano.
- 8. A tracing of earthquake motion that is created by a seismograph
- 11. Eruption
- 13. Chamber The body of molten rock that feeds a volcano.
- 15. Movement of the Earth’s crust that occurs when rocks suddenly break and release stored energy.