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transform fault

Area where the earth's lithospheric plates move in opposite but parallel directions along a fracture (fault) in the lithosphere.


an upward fold in rock formed by compression of Earth's crust


a downward fold in rock formed by compression in earth's crust

reverse fault

rocks above the fault surface move up and over the rocks below the fault surface

normal fault

a fault where tension pulls the rocks apart

thrust fault

a geological fault in which the upper side appears to have been pushed upward by compression

isostaic adjustment

compression caused by glaciers


point on earth's surface directly above an earthquake


the pint below earth's surface were energy is released in the form of seismic waves

elastic rebound theory

how regular earthquakes form


an instrument that is used to register earthquake waves and record the time that each arrived

richter scale

used to describe the strength of an earthquake based on the height of the lines on the sesmigram


sesmic sea waves that begin over an earthquake focas and can be highly destructive when it crashes

where do most earthquakes occor?

convergent plate boundries/over active geologic faults

why do earthquakes occur in Massachusetts


how do scientist locate and measure earthquakes?

sesmic graph

what hazards are associated with earthquakes

large objects could fall on you, houses can be shaken to the ground, in can shake and explode radioactive matiriel, it can cause tsunamis

where is the aafest place to be durring an earthquake?

away from anything...especially the epicenter

what number on the richer scale do big earthquaes have


where is the ring of fire located and what happens there?

the pacific ring of volcanoes, a line of active volcanoes that traces the edges of te subducting pacific plat, underwater

hot spot

a smalll area of the mantle that remains extreamly hot for a long period of time


bits of rock or solidified lava dropped from the air during an explosive volcanic eruption; ranges in size from volcanic ash to volcanic bombs and blocks


rock that in its molten form (as magma) issues from volcanos

pyroclastic flows

scalding avalanche of ash and hot, toxic expanding gas, traveling very fast down the flank of a volcano


mudflows (water mixed with ash) often folled by eruptions

what is the difference between continental on oceanic volcanic eruptions?

oceanic plates; made out of basalt, produces maffic magma high in magnisium and iron produced quiet non explodive eruptions
continental; made our of granite, produces felsic magma high in silicaproduces explosive eruptions

what determines if an earthquake will be violent or quiet?

if it is high in silica i t will be violent because that bulilds up preassure

how did most volcanoes form?

divergent plate boiundries convergen plate boundries and hot spots

what are signals that a volcano might erupt

occorances of earthquakes changes in gasses (sulfer) a buldge in the side of a volcano

what are some of the dangers of earthquakes

lava can destroy rhoads and building nd can set things on fire, gass can also be poisinous

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