| A | B |
|---|
| foreshock | Small earthquake that often precede a major earthquake. |
| inner core | The solid innermost layer of Earth, about 1300 kilometers (800 miles) in radius. |
| liquefaction | A phenomenon in which soils and other unconsolidated materials containing abundant water are turned into a fluidlike mass |
| lithosphere | The rigid outer layer of the earth, including the crust and upper mantle |
| magnitude | The total amount of energy released during an earthquake. |
| mantle | The 2900-kilometer (1800- mile)-thick layer of Earth located below the crust. |
| Mercalli intensity scale | A 12-point scale originally developed to evaluate earthquake intensity based on the amount of damage to various Structures. |
| Mohorovicic discontinuity (Moho) | The boundary separating the crust from the mantle, discernible by an increase in seismic velocity. |
| outer core | A layer beneath the mantle about 2200 kilometers (1364 miles) thick that has the properties of a liquid. |
| primary (P) wave | A type of seismic wave that involves alternating compression and expansion of the material through which it passes. |
