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Chapter 8 and 10 voc
| Term | Definition |
|---|---|
| earthquake | vibration of earth |
| focus | point where earthquakes start |
| seismic waves | waves of energy released by an earthquake |
| epicenter | point on Earth's surface directly above the focus |
| elastic rebound | sudden return of deformed rock back to under formed shape |
| body waves | seismic waves that move through the inside of earth |
| P waves | push-pull body waves |
| S waves | side to side body waves |
| surface waves | seismic waves that move on earths surface |
| seismograph | seismic waves recorded |
| seismogram | vibrations traced |
| Richter Scale | numerical scale based on height |
| Moment Magnitude | small shallow earthquakes used |
| Modified Mercalli scale | measures intesity |
| liquefaction | soil and rock are saturated with water earthquakes |
| tsunami | a wave formed when the ocean |
| seismic gap | an area along a fault where there is not been any earthquake activity for a long period of time |
| crust | the thin rocky the thin outer layer of earth |
| mantle | a solid rocky shell that extends to a depth |
| outer core | liquid layer 2260 kilometers |
| inner core | sphere having a radius of 1220 |
| Moho | the name of a boundary |
| Ring of Fire | volcanoes and earthquakes are concentrated along the pledge of the pacific ocean |
| hot spot | volcanic areas for plate boundaries |
| viscosity | substance resistance to flow |
| vent | opening to surface |
| pyroclastic material | particles produced in volcanic eruptions |
| volcano | repeated eruptions of lava building up to the mountain |
| crater | steep walled depression |
| shield volcano | broad slightly domed structures that resembles a warriors shield |
| caldera | volcanic landforms |
| lahar | water soaked volcanic ash |
| pluton | cooling and hardening of magma |
| sill | a pluton where magma flows between parrell layers of rock |
| laccolith | a lens shape pluton |
| dike | a pluton that forms when magma moves into fractures that cut across rock layers |
| batholith | large bodies of intrusive igneous rock |