| A | B |
|---|
| Aftershock | Smaller earthquakes that follow a large one. |
| Asthenosphere | Weak layer in the upper mantel with a small amount of melting. |
| Reverse Fault | break in rock caused by compressive forces, where rock above the fault surface moves upward relative to the to the rock below the fault surface |
| Crust | Thin outer layer of the earth |
| Earthquake | A vibration in the earth because of a rapid release of energy. |
| Elastic Rebound | The springing back of the Earth to its primary position. |
| Epicenter | Location on the surface directly above the focus. |
| Fault | Fractures in the Earth’s surface. |
| Normal Fault | break in rock caused by tension forces, where rock above the fault surface moves down relative to the rock below the rock surface |
| Focus | The location of the earthquake. |
| Strike-slip Fault | break in rock caused by shear forces, where rocks move past each other without much vertical movement |
| Inner Core | Solid metal center of the planet. |
| Liquefaction | Where stable soil becomes an unstable liquid. |
| Lithosphere | Sphere of rock located on the outside. |
| Magnitude | The power of something. |
| Mantle | Thick rocky layer underneath the crust. |
| Mercalli Intensity Scale | Old scale the determined earthquakes strength based on destruction that it caused to buildings. |
| Outer Core | Mobile core that is made of a liquid. |
| Primary (P) Wave | Push Pull waves that can travel though all materials. |
| Richter Scale | Scale that is used by determining the amplitude of the earthquake. |
| Secondary (S) Wave | Shake wave cannot travel in gases or liquids. |
| Seismic Sea Wave (tsunami) | A large wave of water caused by an earthquake. |
| Seismogram | Records of earthquakes that exhibit the waves. |
| Seismograph | Instruments that read and record earthquakes. |
| Seismology | Study of earthquakes. |
| Surface Wave | Waves that travel along the surface. |
