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1
Low viscosity lava
A)forms composite cones
B)is characteristic of volcanoes along convergent plate boundaries
C)is basaltic or mafic in composition
D)all of the above
2
A volcanic dome
A)forms from viscous lava
B)is basaltic in composition
C)characterizes oceanic ridge volcanism
D)forms from very extensive flow sheets
3
Composite volcanoes develop from eruption of
A)low viscosity lava
B)basaltic lava
C)andesitic lava and pyroclasts
D)rhyolitic pyroclasts
4
Which type of volcano can be expected to erupt explosively?
A)composite volcano
B)mid-ocean ridge
C)shield
D)fissure basalt eruption
5
Which is composed of pyroclastic material from explosive volcanic eruptions?
A)lahar
B)nuée ardente
C)ash
D)all of the above
6
Mt. St. Helens is a volcano that occurs
A)along a transform fault
B)at a divergent plate boundary
C)at a convergent plate boundary
D)above a mantle hotspot
7
Shield volcanoes have
A)low viscosity lava
B)high viscosity lava
C)much explosive activity
D)rhyolite lava
8
Cinder cones:
A)can occur in the final stages of a basaltic lava eruption.
B)always form on the flanks of composite volcanoes.
C)always form on the flanks of shield volcanoes.
D)only occur along divergent plate boundaries
9
Magma with the greatest capacity for trapping gases is
A)ultramafic
B)mafic
C)intermediate
D)felsic (silicic)
10
Most damage when a volcano like Mt. St. Helens erupts results from
A)fast-moving lava flows
B)pyroclastic flows and floods in valleys
C)extensive lava flows
D)blowdown by the blast (shock wave)
11
Increased seismic activity beneath and within a volcano indicates:
A)that the volcano is collapsing
B)that magma is moving and may erupt
C)that the plate has shifted beneath the volcano
D)that no eruption is imminent.
12
Rhyolite lava
A)forms shield volcanoes
B)has high viscosity
C)is basaltic
D)all of the above
13
Cinder cones have
A)explosive eruptions
B)non-explosive eruptions
C)rhyolite lava flows
D)all of the above
14
Most andesitic volcanoes are located
A)along a transform fault
B)at a divergent plate boundary
C)at a convergent plate boundary
D)above a mantle hotspot
15
Basaltic volcanoes
A)only occur at convergent plate boundaries
B)are found only in Africa
C)are found only in North America
D)always form at Hot Spots
16
Shield volcanoes are composed of
A)basaltic lava
B)andesitic pyroclastics
C)andesitic lava
D)rhyolitic pyroclastics
17
The two-year global cooling caused by the eruption of Mt. Pinatubo resulted from
A)nuée ardentes
B)ash
C)lahars
D)sulfuric-acid mist
18
The volcanoes of the Aleutian Islands are located
A)along a transform fault
B)at a divergent plate boundary
C)at a convergent plate boundary
D)above a mantle hotspot
19
Yellowstone is located
A)along a transform fault
B)at a divergent plate boundary
C)at a convergent plate boundary
D)above a mantle hotspot
20
In its last eruption, the Yellowstone caldera ejected 1,000 cubic kilometers of pyroclastics, making this eruption
A)smaller than Mt. Mazama's (Crater Lake) last eruption
B)smaller than Mt. Pinatubo's eruption in 1991
C)smaller than Mt. St. Helens's eruption in 1980
D)larger than all of the above
21
Silica-rich magmas produce
A)basalt lava.
B)mafic rock.
C)low-viscosity lava.
D)more-violent eruptions.
22
Pyroclastic eruptions on a snow-capped volcano
A)stop when the melting snow cools the eruption.
B)are physically impossible.
C)can create dangerous lahars.
D)cause the volcanic ash to solidify.
23
Lava was diverted from an Icelandic harbor
A)by cooling it with sea water.
B)when it flowed over a glacier.
C)by plugging the volcanic vent.
D)because of a large earthquake.
24
The Caribbean volcano Mt. Pelee destroyed the town of St. Piere with
A)mudflows.
B)lava flows.
C)pyroclastic flows.
D)toxic gas flows.
25
Most lava flows advance at speeds of
A)a few km per hour.
B)a few km per minute.
C)a few km per second.
D)many km per second.





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