| A | B |
|---|
| Focus | The point beneath Earth's surface where rock breaks under stress and causes an earthquake |
| Epicenter | The point on Earth's surface directly above an earthquake's focus |
| Seismic Wave | A vibration that travels through Earth carrying the energy released during an earthquake |
| Magnitude | The measure of an earthquake's strength based on seisimic waves and movement along faults |
| Liquefaction | The process by which an earthquake's violent movement suddenly turns loose soil into liquid mud |
| Aftershock | An earthquake that occurs after a larger earthquake in the same area |
| Tsunami | A large wave produced by an earthquake on the ocean floor |
| Volcano | A weak spot in the crust where magma has come to the surface |
| Lava | Liquid magma that reaches the surface |
| Magma | The molten mixture of rock-forming substances, gases and water from the mantle |
| Hot Spot | An area where magma from deep within the mantle melts through the crust above it |
| Silica | A merial that is formed from the elements oxygen and silicon |
