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Earthquakes Test

Enter the letter for the matching Answer
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1.
magma
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2.
Focus
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3.
divergent boundary
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4.
Magnitude
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5.
Understand how the depth of focus affects an earthquake’s intensity.
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6.
number of major tectonic plates worldwide; name of our tectonic plate
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7.
Know where earthquakes are most likely to happen.
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8.
hot spot
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9.
Epicenter
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10.
seismic gap
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11.
which events may signal an impending eruption
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12.
convergent boundary
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13.
lava
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14.
pyroclastic material
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15.
Intensity
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16.
composite volcanoes
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17.
Seismograph
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18.
mid-ocean ridge
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19.
characteristics of mid ocean ridge
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20.
ring of fire
A.
a zone of active volcanoes surrounded the Pacific Plates
B.
liquid rock produced under earth´s surface
C.
The machine that records vibrations (seismic waves) during an earthquake.
D.
sediment was thinner closer to the center of the ridge, rocks were younger closer to the center of the ridge
E.
an area along a fault where relatively few earthquakes have occurred recently, but where strong earthquakes are known to have occurred in the past.
F.
swarm of small earthquakes, increased gasses or small plumes of ash, ground inflation, changes in the slope of the volcanoes flank
G.
With all other factors being equal, the deeper the focus (farther below ground), the lower the intensity, and the shallower the focus (closer to the surface), the greater the intensity.
H.
a measure of the damage caused by an earthquake
I.
fragments that form an explosive volcanic eruption
J.
Earthquakes are most likely to happen along a transform plate boundary. Earthquakes are very common around the Ring of Fire
K.
the point on Earth’s surface directly above an earthquake’s starting point, or focus.
L.
magma that flows onto earths surface; the rock that forms when lava cools and solidifies
M.
the boundary between tectonic plates that are moving away from each other
N.
alternating layers of lava and pyroclastic material
O.
a measure of the strength of an earthquake.
P.
a volcanically active area of earths surface, commonly far from a tectonic plate boundary
Q.
the boundary between two plates that are colliding
R.
15; north american plate
S.
A long undersea mountain chain that has a steep narrow valley at its center that forms as magma rises from the asthenosphere and that creates new oceanic lithosphere as tectonic plates move apart.
T.
the location within the Earth along a fault at which the first motion of an earthquake occurs.
Type the Question that corresponds to the displayed Answer.
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21.
a giant ocean wave that forms after a volcanic eruption, submarine (under water) earthquake, or landslide.
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22.
the process which new oceanic lithosphere forms when magma rises to earths surface at mid ocean ridges and solidifies as older existing sea-floor moves away from the ridge
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23.
A tracing of earthquake motion that is recorded by a seismograph.
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24.
energy released in the form of vibrations as rocks along a fault slip into new positions.
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25.
the sudden return of elastically deformed rock to its undeformed shape.
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26.
The hypothesis that a single large landmass broke up into smaller landmasses to form the continents which then drifted to there present locations.
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27.
broad at the base with gently sloping side
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28.
the boundary between tectonic plates that are sliding past each other horizontally
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29.
a region of numerous, closely spaced faults. (Ex: North Anatolian fault zone in Turkey.)
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30.
form at a convergent plate boundary when the more dense oceanic crust slides beneath the less dense continental crust

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