Which waves travel the deepest into the center of Earth?
a. P-waves
b. S-waves
c. surface waves
d. They all travel to the center of the inner core.
What is a. P-waves
100
Which movement of two blocks of rock along a fault causes an earthquake to occur?
a. sliding horizontally past each other
b. moving toward each other
c. pulling away from each other
d. any of the above
What is d. any of the above
100
Which describes the makeup of volcanic ash?
a. particles of pulverized rock and vegetation
b. particles of pulverized rock and glass
c. pulverized bits of glass
d. pulverized particles of rock
What is b. particles of pulverized rock and glass
100
In what way do volcanic eruptions affect the climate?
a. They cause a global temperature increase.
b. They cause a global temperature decrease.
c. They cause a global precipitation increase.
d. They cause a global precipitation decrease.
What is b. They cause a global temperature decrease.
100
The ____ waves are the first to reach a seismograph after an earthquake.
a. surface
b. secondary
c. primary
d. tsunami
What is c. primary
200
Which factor does NOT effect the speed of a seismic wave?
a. temperature c. chemistry of the rocks
b. season of the year d. pressure
What is b. season of year
200
The magnitude of an earthquake is measured by the ____.
a. Richter scale
b. moho discontinuity
c. modified Meralli scale
d. elastic limit
What is a. Richter scale
200
A break in Earth’s lithosphere where one block of rock moves toward, away from, or past another is called a(n) ____.
a. fault
b. earthquake
c. strain
d. stress
What is a. fault
200
Describe a pyroclastic flow. List two specific things
Pyroclastic flows move at speeds of more than 100 km/hr and have temperatures over 2,000°C. They are fast moving avalanches of hot gas, rocks and gases.
200
Daily Double !!!!
At least ____ seismographs are needed to accurately locate an earthquake epicenter.
a. two
b. five
c. four
d. three
What is d. three
300
Seismic waves ____ when they reach the bottom of the crust.
a. slow down
b. stay the same
c. stop
d. speed up
d
300
Primary waves ____ when they hit the liquid outer core.
a. slow down
b. stay the same
c. stop
d. speed up
What is a. slow down
300
Daily Double!!!!
The point in Earth's interior where the energy release of an earthquake occurs is the ____.
a. focus
b. epicenter
c. fault
d. inner core
What is a. focus
300
How does the amount of silica content change the viscosity of magma? How does this affect the flow of the magma?
A low silica content leads to a low viscosity and a faster rate of flow.
Or
High silica content leads to a high viscosity and a slower rate of flow.
300
Kilauea in Hawaii is the world's most ____ volcano.
a. dormant
b. active
c. explosive
d. all of the above
What is b. active
400
Scientists discovered changes in Earth's interior by studying ____.
a. tsunamis
b. tides
c. changes in seismic waves
d. all of the above
What is c. changes in seismic waves
400
When the force on rocks is great enough, they break, producing vibrations called ____.
a. faults
b. earthquakes
c. strains
d. stresses
What is b. earthquakes
400
1. instruments that record seismic activity
2. graphical illustration of earthquake waves
What is seismometer
What is seismogram
400
Where can volcanoes form?
a. convergent plate boundaries
b. divergent plate boundaries
c. over hotspots in the middle of plates
d. all of the above
What is d. all of the above
400
If, after an eruption, the top of a volcano collapses down, a ____ forms.
a. caldera
b. vent
c. cone
d. volcanic neck
What is a. caldera
500
The most destructive seismic wave are ____.
a. primary waves
b. secondary waves
c. P-waves
d. surface waves
What is d. surface waves
500
Secondary waves ____ when they hit the liquid outer core.
a. slow down
b. stay the same
c. stop
d. speed up
What is c. stop
500
Which occurrence would be unlikely if Mount St. Helens experiences another major eruption?
a. pyroclastic flows
b. a release of gases
c. earthquake swarms
d. widespread basaltic lava flows
what is D
500
A ____ often forms a mountain when layers of lava and volcanic ash erupt and build up.
a. caldera
b. volcano
c. dike
d. batholith
What is b. volcano
500
Basaltic magma produces nonexplosive eruptions such as those at ____.
a. Mount St. Helens
b. Mount Pinatubo
c. Kilauea
d. Mount Unzen