Geol 107: Geology Goes to Holywood » Fall 2019 » Volcano Quiz

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Question #1
The following maps show the position of the Earth's continents and oceans. The dots on each map mark the locations where volcanic eruptions occur on land. Which map do you think most closely represents the places where these volcanoes are typically observed?
A.   Mostly along the margins of the Pacific Ocean
B.   Mostly along the margins of the Pacific and Atlantic Oceans
C.   Mostly on islands
D.   Mostly on continents
E.   Mostly in warm climates
Question #2
Which mineral in lava has the biggest effect on viscosity?
A.   Pyroxene
B.   Silica
C.   Basalt
D.   Plinian
Question #3
Which is more viscous... Corn syrup or water?
A.   No answer text provided.
B.   They usually have very similar viscosities.
C.   Corn Syrup
D.   Water
Question #4
One big problem with Hollywood depictions of volcanoes is that they throw together a whole bunch of different types of hazards that wouldn't happen in the same volcano at the same time. Which two hazards DO NOT go well together? (i.e., you wouldn't find them happening on the same volcano at the same time)
A.   Fast moving lava flow and lava bombs
B.   Pyroclastic Flow and Ash Fall
C.   Pyroclastic flow and Lahar
D.   Ash fall and fast moving lava flows
Question #5
InSAR tells you about:
A.   the temperature of groundwater
B.   the amount of surface deformation
C.   the intensity of volcanic tremor
D.   the composition of volcanic gases
Question #6
Which tectonic setting usually produces magmas with the highest silica content?
A.   Near a subduction zone
B.   Near a mid ocean ridge
C.   All of these are known for producing high silica magmas.
D.   Near an ocean island hot spot
Question #7
Which travels fastest
A.   Geyser eruption
B.   Pyroclastic flow
C.   Andesite lava
D.   Basalt lava
E.   Rhyolite lava
Question #8
Mt. Vesuvius has been described as Europe's ticking time bomb. When did Mt. Vesuvius last erupt?
A.   2013
B.   1944
C.   79
D.   279
E.   1924
Question #9
We often classify volcanoes by the shape of the mountain that forms. "Shield volcanoes" are shaped like a shield. What determines this shape?
A.   the explosive nature of the eruptions that produce the shield
B.   lava viscosity
C.   local variations in the tilt of the land surface
D.   proportion of pyroclastic debris included in the edifice
Question #10
Which of the following statement(s) is/are true about volcanic hazards? (select ALL that apply),,
A.   Most lava flows pose less danger than eruptions of ash.
B.   Most lava flow paths can be easily predicted by looking at the slope of the ground.
C.   Most lahars occur when a volcano erupts lava that is high in silica.
Question #11
Why do earthquakes often occur before a volcano erupts? Select all that are correct.,,
A.   The pressure on rocks from moving magma can cause rocks around the magma to slide along faults.
B.   Trick question. Earthquakes rarely occur before eruptions.
C.   Frictional heat from earthquake sliding causes rock to melt into magma.
D.   The sudden increase in pressure associated with escape of gas from magma can cause nearby rocks to fracture.
Question #12
When a magma gets HOTTER, its VISCOSITY will:
A.   Decrease
B.   Increase
C.   Stay the same
D.   Impossible to know
Question #13
When a magma gets HOTTER, its SPEED will:
A.   Decrease
B.   Impossible to know
C.   Stay the same
D.   Increase
Question #14
Dr. Evil has a plan to make more of the mantle melt, which will cause more volcanoes. He plans to add extra weight to the surface, which will increase the pressure on the mantle.  Will his plan work?
A.   No. Melting happens when you decrease the pressure on the mantle rocks.
B.   Yes. Melting happens when you increase pressure on mantle rocks.
C.   No. You need to add too much weight in order for the pressure to increase enough to cause melting.
D.   Yes. Volcanoes explode as pressure builds up.

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