EOSC 114 Volcanoes UPDATED ACTUAL Questions and
CORRECT Answers.
What correctly describes volcanism at a continental volcanic arc? - ans -High
Viscosity dacitic lavas and explosive volcanism
Most magma is generated by melting of pre-existing rock through _________. -
ans -decompression melting
The majority of the world's explosive volcanoes are found at: - ans -Convergent
plate boundaries
Which volcanic hazards is the LEAST hazardous to humans? - ans -Lava
What is NOT a product of a volcanic eruption? - ans -intrusive igneous rocks
The MOST LIKELY place to find an active subaerial volcano is ______. - ans -Above
a subduction zone
A magma erupting at a temperature of 600-800°C, with high silica content, high
gas content, and high viscosity will erupt as a/an _________. - ans -rhyolite
pyroclastic flow in a caldera
he explosivity of hot spot volcanism is dictated by ? - ans -the composition of the
overlying plate
True or False: about volcanism in an ocean-ocean convergence setting? Mafic-
intermediate lavas are common. - ans -True
How does a cinder cone form? - ans -Relatively short-lived eruptions of pyroclastic
material build up a small volcano.
Which volcanic hazard does hydrothermal alteration promote? - ans -Landslides
True or False: A Lava flow is is not typical of cinder cone eruptions - ans -False
, Immediately after an eruption at Kilauea in Hawaii, the surface of the volcano
______. - ans -subsides, making the slopes of the volcano less steep
Which of the following volcanic hazards is typically the DEADLIEST for people? -
ans -pyroclastic flows from stratovolcanoes
Which of the following eruptions had the highest Volcanic Explosivity Index (VEI)?
- ans -Yellowstone caldera, 600,000 years ago
Which volcano poses the GREATEST risk to life and property in Vancouver and
southern British Columbia? - ans -Mount Baker
Which magma composition will produce the most explosive volcanoes? - ans -
Rhyolite
What magma has the highest viscosity ? - ans -Rhyolite
Which of the following poses the GREATEST hazard to the Metro Vancouver area
from a nearby volcanic eruption? - ans -Ash Fall
During the 1986 lake Nyos eruption, the most dangerous areas to be in
were_____because the gas was______? - ans -In valleys,denser than air
what magma type is produced by partial melting of the Earth's mantle? - ans -
Mafic
Fatalities from volcanic eruptions have increased steadily over the past 200 years
because _________. - ans -the world's population has increased and people are
living closer to 100% volcanoes.
True or False:Mount St. Helens is a composite volcano that can erupt magmas
with the entire possible range of silica contents. - ans -True
What type of volcanic landform is MOST commonly associated with Hawaiian
mafic volcanism? - ans -Shield Volcano
A high volcano explosivity index (VEI) generally corresponds with _________. - ans
-Long recurrence intervals
CORRECT Answers.
What correctly describes volcanism at a continental volcanic arc? - ans -High
Viscosity dacitic lavas and explosive volcanism
Most magma is generated by melting of pre-existing rock through _________. -
ans -decompression melting
The majority of the world's explosive volcanoes are found at: - ans -Convergent
plate boundaries
Which volcanic hazards is the LEAST hazardous to humans? - ans -Lava
What is NOT a product of a volcanic eruption? - ans -intrusive igneous rocks
The MOST LIKELY place to find an active subaerial volcano is ______. - ans -Above
a subduction zone
A magma erupting at a temperature of 600-800°C, with high silica content, high
gas content, and high viscosity will erupt as a/an _________. - ans -rhyolite
pyroclastic flow in a caldera
he explosivity of hot spot volcanism is dictated by ? - ans -the composition of the
overlying plate
True or False: about volcanism in an ocean-ocean convergence setting? Mafic-
intermediate lavas are common. - ans -True
How does a cinder cone form? - ans -Relatively short-lived eruptions of pyroclastic
material build up a small volcano.
Which volcanic hazard does hydrothermal alteration promote? - ans -Landslides
True or False: A Lava flow is is not typical of cinder cone eruptions - ans -False
, Immediately after an eruption at Kilauea in Hawaii, the surface of the volcano
______. - ans -subsides, making the slopes of the volcano less steep
Which of the following volcanic hazards is typically the DEADLIEST for people? -
ans -pyroclastic flows from stratovolcanoes
Which of the following eruptions had the highest Volcanic Explosivity Index (VEI)?
- ans -Yellowstone caldera, 600,000 years ago
Which volcano poses the GREATEST risk to life and property in Vancouver and
southern British Columbia? - ans -Mount Baker
Which magma composition will produce the most explosive volcanoes? - ans -
Rhyolite
What magma has the highest viscosity ? - ans -Rhyolite
Which of the following poses the GREATEST hazard to the Metro Vancouver area
from a nearby volcanic eruption? - ans -Ash Fall
During the 1986 lake Nyos eruption, the most dangerous areas to be in
were_____because the gas was______? - ans -In valleys,denser than air
what magma type is produced by partial melting of the Earth's mantle? - ans -
Mafic
Fatalities from volcanic eruptions have increased steadily over the past 200 years
because _________. - ans -the world's population has increased and people are
living closer to 100% volcanoes.
True or False:Mount St. Helens is a composite volcano that can erupt magmas
with the entire possible range of silica contents. - ans -True
What type of volcanic landform is MOST commonly associated with Hawaiian
mafic volcanism? - ans -Shield Volcano
A high volcano explosivity index (VEI) generally corresponds with _________. - ans
-Long recurrence intervals
