| A | B |
|---|
| Earthquake | The shaking and trembling that results from the sudden movement of part of the Earth's crust |
| Tsunami | A giant sea wave produced by an earthquake |
| Focus | The underground point of origin(beginning) of an earthquake, where the rocks break and move |
| Epicenter | The point on Earth's surface directly above the focus of an earthquake |
| Seismic wave | An earthquake wave |
| Primary wave, P wave | A push-pull seismic wave, which can travel through solids, liquids, and gases; the fastest kind of seismic waves |
| Secondary wave, S wave | A side to side earthquake wave, which can travel through solids but not through liquids and gases; S waves are slower than P waves but faster thatn L waves |
| fault | a break or a crack along which rocks move |
| Seismograph | An instrument that detects and measures seismic waves |
| Seismologist | A scientist that studies earthquakes |
| Ring of fire | earthquake and volcano zone that encircles the Pacific Ocean |
| crater | a pit at the top of a volcanic cone |
| San Andreas | a fault in california extending for about 600 miles |
| volcanoes | windows into the earth's interior |
| thousands | number of earthquakes felt at the surface each year |
| ten | The Richter scale goes from 1-10 the strength on this scale goes up by __________x |
