Earthquakes 1
What is an instrument that is used to record seismic waves?
a seismograph
The point along a fault where an earthquake starts.
Focus
_______________ is the change in shape of rock due to stress.
Deformation
This type of eruption is generally the most destructive.
A) nonexplosive
B) explosive
Explosive
Which type of eruption produces more pyroclastic materials?
a) nonexplosive
b) explosive
explosive
Which seismic waves are the fastest?
P waves
The scale used to measure the intensity (or damage) of an earthquake.
Modified Mercalli Intensity Scale
A theory that helps explain the causes of both earthquakes and volcanoes is the theory of:
a) continental drift
b) plate tectonics
c) pyroclastics
plate tectonics
This type of eruption is generally not as destructive.
a) nonexplosive
b) explosive
Nonexplosive
crater
What is the tracing of earthquake motion created by a seismograph?
a seismogram
The point on Earth's surface above the focus.
Epicenter
At divergent plate boundaries:
a) tectonic plates slide past each other
b) tectonic plates move apart
c) tectonic plates collide
tectonic plates move apart (divide)
A type of magma that tends to cause explosive eruptions has a:
a) high silica content
b) low silica content
high silica content
Lava that flows slowly like wax dripping from a candle and forms a glassy surface with rounded wrinkles is called:
a) aa lava
b) pahoehoe lava
c) pillow lava
d) blocky lava
pahoehoe lava
What is the motion of an S wave?
side to side
The scale used to measure the magnitude (or strength) of an earthquake.
Richter Scale
________________ are waves of energy that travel through the Earth, away from an earthquake in all directions.
seismic waves
If magma has a low viscosity it is:
a) thin and runny allowing gas bubbles to easily escape
b) a thick consistency and traps gas bubbles
thin and runny allowing gas bubbles to easily escape
A _____________ results when a magma chamber partially empties.
caldera
The last seismic waves to arrive are:
a) P waves
b) S waves
c) body waves
d) surface waves
surface waves
According to the Modified Mercalli Intensity Scale, total destruction would result at which level?
Level XII (12)
A long, high sea wave caused by an earthquake or other event.
Tsunami
A type of magma that tends to cause explosive eruptions has a:
a) high water content
b) low water content
high water content
Where is the Ring of Fire located?
along the Pacific plate boundary