Mount St. Helens, Before its eruption in 1980, Mt. St. Helens was an excellent example of:
a shield volcano,
a dormant volcano,
an extinct volcano, or
an active volcano.
What is a dormant volcano?
100
A volcano that has not erupted in 1000 years is best described as:
active, dormant, or extinct.
What is dormant?
100
The fastest type of seismic waves are:
P waves, Surface waves, S waves, or tsunami.
What are P waves?
100
A seismograph is basically a:
lens, wheel, lever, or pendulum.
What is a pendulum?
100
After steam, the most abundant component of volcanic gases:
argon, carbon dioxide, hydrogen sulfide, sulfur dioxide, or
nitrogen.
What is carbon dioxide?
200
This rock is so porous it often floats on water:
gabbro, obsidian, pumice, granite, or rhyolite.
What is pumice?
200
Molten rock which does not reach the surface is called:
volcanic ash, magma, basalt, or lava.
What is magma?
200
This is how much more energy is released by a magnitude 5 earthquake than by one of the magnitude 2?
2.5 times, 1,000 times, 3 times, 27,000 times, or 30 times.
What is 27,000 times?
200
An epicenter is:
the location where rupture begins,
the point on the Earth's surface vertically above the focus,
the same as the hypocenter, or
the location where energy is released.
What is the point on the Earth's surface vertically above the focus?
200
When molten rock reaches the surface, it's called:
lava, slag, magma, or granite.
What is lava?
300
One other Cascade Range volcano besides Mount St. Helens that has erupted since 1900 is:
Mount Hood, Oregon,
Mount Adams, Washington,
Mount Lassen, California,
Mount Mazama, Oregon, or
Mount Garibaldi, British Columbia.
What is Mount Lassen, California?
300
The property of a magma that determines whether or not it flows easily:
density, viscosity, color, or iron content.
What is viscosity?
300
Seismic waves travel at greater speeds through:
less rigid material,
granites than basalts,
more rigid material, or
the outer core than the inner core.
What is more rigid material?
300
Which of the following usually causes the greatest amount of damage and loss of life?
fire, building collapse, tsunami, landslides, or ground shaking
What is building collapse?
300
These lavas erupt hottest:
pumice, basalt, andesite, or rhyolite.
What is basalt?
400
This is why some minerals, like olivine and quartz, can't occur together:
some occur in volcanic rocks, others in plutonic rocks,
they are both silicates,
neither of them contains silica, or
they are chemically incompatible.
What is they are chemically incompatible?
400
The Columbia Plateau in the northwestern U.S. is an excellent example of:
an eroded shield volcano,
deposits of flood basalts,
extensive deposits of pyroclastic debris, or
a chain of composite volcanoes.
What are deposits of flood basalts?
400
The Earth's core is thought to be:
hollow,
composed of rock with a high silica content,
completely molten,
composed mostly of iron and nickel, or
completely solid.
What is composed mostly of iron and nickel?
400
A tsunami is a:
measure of the energy released by an earthquake,
seismic sea wave,
precursor to an earthquake,
locked portion of a fault, or
seismic gap.
What is a seismic sea wave?
400
With few exceptions, the most destructive earthquakes are:
shallow focus, intermediate focus, or deep focus.
What is shallow focus?
500
This is the largest volcano in the world (height, volume, or diameter):
Mount St. Helens, Washington,
Mount Vesuvius, Italy,
Mount Etna, Sicily,
Mauna Loa, Hawaii, or
Fujiyama, Japan.
What is Mauna Loa, Hawaii?
500
Basalt plateaus form as a result of:
repeated eruptions of cinder cones,
widespread ash falls,
accumulation of thick layers of pyroclastic materials, or
eruptions of fluid lava from long fissures.
What are eruptions of fluid lava from long fissures?
500
The magnetic field is probably generated by:
the tilt of the Earth's rotational axis,
the solar wind,
fluid movements in the outer core,
deformation of the asthenosphere, or
a large deposit of magnetite at the North Pole.
What is fluid movements in the outer core?
500
The most dangerous type of construction for earthquake-prone regions:
adobe,
reinforced masonry,
concrete block,
steel frame, or
wood frame.
What is adobe?
500
The instrument used to record earthquakes waves is called:
quakeometer, strainometer, seismogram, or seismograph.