GLY1880: EXAM 2 QUESTIONS AND
ANSWERS GRADED A+ 2025/2026
Which size of tephra travels the farthest?
a) bombs
b) blocks
c) lapilli
d) ash - ANS d) ash
Which of the following are common impacts of ash?
a) damage to water and food supplies
b) damage to airplanes
c) impacts to agriculture
d) all of these - ANS d) all of these
A lahar is a mixture of rock fragments and ____
a) concrete
b) water
c) gases
d) exploding volcanic bombs - ANS b) water
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,Lahars, pyroclastic flows, and landslides would be expected to be more common on composite
volcanoes than shield volcanoes because:
a) composite volcanoes have less volcanic gases
b) basalt slides more easily than pyroclastic material
c) composite volcanoes have steeper sides than shield volcanoes - ANS c) composite
volcanoes have steeper sides than shield volcanoes
Which of the following is an important difference between lahars and landslides?
a) lahars have a higher amount of water
b) lahars are slower moving
c) lahars have more gas
d) lahars only occur during eruptions - ANS a) lahars have a higher amount of water
In terms of hazards from carbon dioxide, pyroclastic flows, and lahars, the most dangerous
location is:
a) low lying areas
b) ridge tops
c) all areas are equally dangerous
d) the top of the volcano - ANS a) low lying areas
Which of the following is true of lava flows?
a) mafic magma generally flows more slowly than felsic magma
b) lava flows generally cause less deaths than pyroclastic flows or lahars
c) most homeowners can rebuild within a few months after a lava flow covers their property
d) none of these - ANS b) lava flows generally cause less deaths than pyroclastic flows or
lahars
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, Carbon dioxide from volcanoes has caused deaths because it tends to:
a) collect in low lying areas
b) explode
c) trigger earthquakes
d) quickly rise and expand - ANS a) collect in low lying areas
Sulfur dioxide can:
a) enhance the ozone layer
b) contribute more greenhouse gas each year than from human activities
c) irritate respiratory systems
d) all of these - ANS c) irritate respiratory activities
If you are investigating an area for prehistoric volcanic hazards, what might you look for in the
geologic record?
a) for lahars, you could look for evidence of hot ash that burned everything in its path
b) for lava flows, you could look for gabbro, diorite, or granite
c) for carbon dioxide releases, you could look for a lot of animal or plant deaths, but the carbon
dioxide would have dispersed
d) all of these - ANS c) for carbon dioxide releases, you could look for a lot of animal or plant
deaths, but the carbon dioxide would have dispersed
What type of volcano is the Pu'u O'o crater in Kilauea and what is the common hazard?
a) shield, lava flows
b) composite, pyroclastic flows
c) rhyolite caldera collapse, ash falls
d) flood basalts, volcanic gases - ANS a) shield, lava flows
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ANSWERS GRADED A+ 2025/2026
Which size of tephra travels the farthest?
a) bombs
b) blocks
c) lapilli
d) ash - ANS d) ash
Which of the following are common impacts of ash?
a) damage to water and food supplies
b) damage to airplanes
c) impacts to agriculture
d) all of these - ANS d) all of these
A lahar is a mixture of rock fragments and ____
a) concrete
b) water
c) gases
d) exploding volcanic bombs - ANS b) water
1 @COPYRIGHT 2026 ALLRIGHTS RESERVED.
,Lahars, pyroclastic flows, and landslides would be expected to be more common on composite
volcanoes than shield volcanoes because:
a) composite volcanoes have less volcanic gases
b) basalt slides more easily than pyroclastic material
c) composite volcanoes have steeper sides than shield volcanoes - ANS c) composite
volcanoes have steeper sides than shield volcanoes
Which of the following is an important difference between lahars and landslides?
a) lahars have a higher amount of water
b) lahars are slower moving
c) lahars have more gas
d) lahars only occur during eruptions - ANS a) lahars have a higher amount of water
In terms of hazards from carbon dioxide, pyroclastic flows, and lahars, the most dangerous
location is:
a) low lying areas
b) ridge tops
c) all areas are equally dangerous
d) the top of the volcano - ANS a) low lying areas
Which of the following is true of lava flows?
a) mafic magma generally flows more slowly than felsic magma
b) lava flows generally cause less deaths than pyroclastic flows or lahars
c) most homeowners can rebuild within a few months after a lava flow covers their property
d) none of these - ANS b) lava flows generally cause less deaths than pyroclastic flows or
lahars
2 @COPYRIGHT 2026 ALLRIGHTS RESERVED.
, Carbon dioxide from volcanoes has caused deaths because it tends to:
a) collect in low lying areas
b) explode
c) trigger earthquakes
d) quickly rise and expand - ANS a) collect in low lying areas
Sulfur dioxide can:
a) enhance the ozone layer
b) contribute more greenhouse gas each year than from human activities
c) irritate respiratory systems
d) all of these - ANS c) irritate respiratory activities
If you are investigating an area for prehistoric volcanic hazards, what might you look for in the
geologic record?
a) for lahars, you could look for evidence of hot ash that burned everything in its path
b) for lava flows, you could look for gabbro, diorite, or granite
c) for carbon dioxide releases, you could look for a lot of animal or plant deaths, but the carbon
dioxide would have dispersed
d) all of these - ANS c) for carbon dioxide releases, you could look for a lot of animal or plant
deaths, but the carbon dioxide would have dispersed
What type of volcano is the Pu'u O'o crater in Kilauea and what is the common hazard?
a) shield, lava flows
b) composite, pyroclastic flows
c) rhyolite caldera collapse, ash falls
d) flood basalts, volcanic gases - ANS a) shield, lava flows
3 @COPYRIGHT 2026 ALLRIGHTS RESERVED.
