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 on islands
C.   Mostly in warm climates
D.   Mostly on continents
E.   Mostly along the margins of the Pacific and Atlantic Oceans
Question #2
Which mineral in lava has the biggest effect on viscosity?
A.   Silica
B.   Pyroxene
C.   Basalt
D.   Plinian
Question #3
Which is more viscous... Corn syrup or water?
A.   Corn Syrup
B.   Water
C.   No answer text provided.
D.   They usually have very similar viscosities.
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.   Pyroclastic flow and Lahar
B.   Ash fall and fast moving lava flows
C.   Fast moving lava flow and lava bombs
D.   Pyroclastic Flow and Ash Fall
Question #5
InSAR tells you about:
A.   the amount of surface deformation
B.   the intensity of volcanic tremor
C.   the composition of volcanic gases
D.   the temperature of groundwater
Question #6
Which tectonic setting usually produces magmas with the highest silica content?
A.   All of these are known for producing high silica magmas.
B.   Near a mid ocean ridge
C.   Near an ocean island hot spot
D.   Near a subduction zone
Question #7
Which travels fastest
A.   Basalt lava
B.   Geyser eruption
C.   Pyroclastic flow
D.   Rhyolite lava
E.   Andesite lava
Question #8
Mt. Vesuvius has been described as Europe's ticking time bomb. When did Mt. Vesuvius last erupt?
A.   1924
B.   79
C.   2013
D.   1944
E.   279
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.   proportion of pyroclastic debris included in the edifice
D.   local variations in the tilt of the land surface
Question #10
Which of the following statement(s) is/are true about volcanic hazards? (select ALL that apply),,
A.   Most lava flow paths can be easily predicted by looking at the slope of the ground.
B.   Most lahars occur when a volcano erupts lava that is high in silica.
C.   Most lava flows pose less danger than eruptions of ash.
Question #11
Why do earthquakes often occur before a volcano erupts? Select all that are correct.,,
A.   The sudden increase in pressure associated with escape of gas from magma can cause nearby rocks to fracture.
B.   Trick question. Earthquakes rarely occur before eruptions.
C.   Frictional heat from earthquake sliding causes rock to melt into magma.
D.   The pressure on rocks from moving magma can cause rocks around the magma to slide along faults.
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.   Increase
B.   Impossible to know
C.   Stay the same
D.   Decrease
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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