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12 and 13 vocab cards
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13
Science
9th Grade
12/13/2011

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Term
earthquake
Definition
a series of vibrations induced in the earth's crust by the abrupt rupture and rebound of rocks in which elastic strain has been slowly accumulating.


something that is severely disruptive; upheaval.
Term
focus
Definition
Geology . the point of origin of an earthquake.
Term
Epicenter
Definition
a point, directly above the true center of disturbance, from which the shock waves of an earthquake apparently radiate.
Term
Fault
Definition
to undergo faulting.
Term
Seismic waves
Definition
shock waves in solid rock generated by earthquakes or underground explosions.
Term
Magnitude
Definition
a measure of the strength of a earthquake
Term
seismograph
Definition
any of various instruments for measuring and recording the vibrations of earthquakes.
Term
Richter scale
Definition
a scale, ranging from 1 to 10, for indicating the intensity of an earthquake.
Term
Tsunami
Definition
an unusually large sea wave produced by a seaquake or undersea volcanic eruption.
Term
Molten
Definition
verb
a past participle of melt.

adjective

liquefied by heat; in a state of fusion; melted: molten lead.
or produced by melting and casting: a molten image.
Term
Magma
Definition
molten material beneath or within the earth's crust, from which igneous rock is formed.
Term
Lava
Definition
the molten, fluid rock that issues from a volcano or volcanic vent.
Term
Volcano
Definition
a vent in the earth's crust through which lava, steam, ashes, etc., are expelled, either continuously or at irregular intervals.

a mountain or hill, usually having a cuplike crater at the summit, formed around such a vent from the ash and lava expelled through it.
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