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chapter 8&10 vocabul

TermDefinition
earthquake movents of the ground due to sudden release of energy
focus point in earth interior where the earthquakes occurred
seismic waves waves of energy released by an earthquakes
epicenter point on earth surface directly above the foves
elastic rebound sudden return of deformed rock back to underformed shape.
body waves seismic waves that move through the inside (body) of earth
p waves (push-pull) body waves.
s waves (side to side) body waves.
surface waves seismic waves that move on earth surface.
seismogragh can consist of a weight suspended from a support attached to bedrock.
seismogram a seismogram shows all three types of seismic waves.
richter scale numerical scale (1-9) based on height of largest seismic wave emagnitude.
moment magnitude scale is derived from the amount of displacement that occurs along a fault.
modified mercalli scale aoman numeral scale (l-xll) that measures the intensity (ground shaking) created by an earthquake.
liquefaction what had been stable soil suddenly turns into liquid.
tsunami a wave formed when the ocean floor shifts suddenly during an earthquake.
seismic gap along a fault where there has not been any earthquake acivity for a long period of time .
crust rocky outer layer of earth, is divided into oceanic and continental crust.
mantle a solid, rocky shell that extends to depth of 2890 kilometers.
outer core is liquid layer 2260 kilomereters thick.
inner core is a sphere having a radius of 1220 kilometers.
moho boundary had been discovered in 1906 between the mantle and outer core.
ring of fire the basin of the Pacific Ocean where a large number of earthquakes
hot spot volcanic areas far from plate boundaries.
viscosity resistance to flow and may be thought of as a measure of fluid.
vent the allows air, gas, or liquid to pass out of or into a confined space.
pyroclastic material the cloud of ash, lava fragments carried through the air, and vapor.
volcano opening (vent) that allows magma to escape to the surface.
shield volcano are produced by the accumulation of fluid basaltic lavas.
cinder cone explosive erurtions of granitic lava .
composite volcano combinatior of forms land 2
caldera one spectacular reminder of what can happen when a volcano activity is the caldera
lahar mudflow made up of water soaked volcanic ash and rock
pluton form the cooling and hardening of magma beneath the surface of earth.
sill is a plutons that form when magma flows between .
laccolith lens-shaped pluton that has pushed the overlying rock layers upwards.
dike pluton that forms when magma moves into fractures that cut across rock layers.
batholith is body of intrusive igneous rock that has surface exposure of more than 100 square kilometers.
Created by: 2007222