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7Sci CH2

7th Science CH2 Forces in Earth

TermDefinition
epicenter Point on Earth’s surface directly above the focus
fault Fracture within Earth along which rock movement occurs; caused by compression forces, tension forces and shearing forces, earthquakes occur as a result of all three types
focus Point deep beneath Earth’s surface where the sudden movement along a fault releases the energy that causes an earthquake
seismic waves Waves generated by earthquakes
vent Opening in Earth’s surface through which volcanic material erupts
composite cone a volcanic cone made of alternating layers of lava and chunks of matter
elastic limit greatest stress and object can take before it breaks
reverse fault a geological fault in which the hanging wall looks like it was pushed up
normal fault a geological fault in which the hanging wall looks like it was pushed down
primary waves rock particles vibrate parallel to the direction of the wave; compressional & extensional; fastest; p-waves
strike-slip fault a fault in which movements are horizontal
vent magma flows out
Created by: djhockett5
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