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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 |