| A | B |
|---|
| L Waves | Surface Waves, slowest |
| S Waves | Secondary Waves, travel slower than P, travel up and down, |
| P Waves | Primary Waves, travel fastest, push-pull waves |
| tsunamis | a giant sea wave produced by earthquakes under the sea. |
| faulting | a braking or cracking along rocks |
| andesite | a variety of ingenious rock that makes up the earth's crust |
| basalt | a light colored rock formed from lava that is light color. |
| seismograph | an instrument that detects and measures sesmic waves |
| epicenter | The point on the earth's surface that is directly above the focus. |
| Richter Scale | The scale used to measure the strength of earthquakes. |
| seismologist | a scientist who studies earthquakes. |
| focus | the underground point of origin where the rocks break and move in an earthquake. |
| volcanic ash | Rock particles >.25 mm and <5 mm across that are blown into air by volcanic erruptions |
| types of volcanes | composite, cinder cone, shield |
| cinders | a small rough volcanic bomb |
| volcanic dust | smallest rock (<0.25 mm)particles blown into air during eruption |
| cinder cone | Volcano made mostly of cinders |
| Composite Volcano | Violent eruption and quiet erruptions |
| Cinder Cone Volcano | Explosive erruptions |
| Shield Volcano | Quieterruptions and lava flow |
| Interior of Earth View | Volcanos provide chemical makeup of magna in the earth's core |
