How Volcanoes Work

 Mt. Etna, Sicily


No. of Questions= 10
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1.  Which of the following were precursor events to the 1980 eruption of Mt. St. Helens?
a) steam eruptions  
b) earthquakes  
c) bulge of volcano's flank  
d) fissure development  
e) all the above  
2.  Death came quickly to the residents of _______ who were encouraged to stay in the town to vote in an upcoming election.
a) Armero  
b) St. Pierre  
c) Nyos village  
d) Paricutin village  
e) Spirit Lake  
3.  Which of the following is not a stratovolcano?
a) Mt. St. Helens  
b) Mt. Pelee  
c) Paricutin  
d) Nevado del Ruiz  
e) all are stratovolcanoes  
4.  Which of the following is the correct sequence of events for the 1980 eruption of Mt. St. Helens?
a) earthquake, vertical blast, landslide, lateral blast  
b) landslide, earthquake, vertical blast, lateral blast  
c) earthquake, lateral blast, landslide, vertical blast  
d) lateral blast, earthquake, vertical blast, landslide  
e) earthquake, landslide, lateral blast, vertical blast  
5.  The gaseous cloud that killed over 1700 people at Lake Nyos was composed of _______.
a) SO2  
b) Cl2  
c) HF  
d) H2S  
e) CO2  
6.  In 1902, about 28,000 residents of St. Pierre, on the island of Martinique, died from ____________.
a) a lahar  
b) a pyroclastic flow  
c) an earthquake  
d) a base surge  
e) Plinian airfall  
7.  The young village of Armero was built directly on top of a(n) ____________ deposit that erupted from Nevado del Ruiz in 1845.
a) pyroclastic flow  
b) Plinian airfall  
c) andesitic lava flow  
d) lahar  
e) landslide  
8.  The lava dome that rose out of the Etang Sec crater after the 1902 eruption of Mt. Pelee (picture) became known as _________.
a) the Spine of St. Pierre  
b) Devil's Tower  
c) Rooster Rock  
d) Dante's Peak  
e) the Tower of Pelee  
9.  The root cause for the 1980 eruption of Mt. St. Helens was ________.
a) subduction  
b) a mantle plume  
c) continental rifting  
d) fissure eruption  
e) none of the above  
10. The Lake Nyos crater (picture) is in reality a ________.
a) caldera  
b) stratovolcano summit crater  
c) tuff ring  
d) maar  
e) pit crater  

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