EAPS 106 TEST 2 QUESTIONS AND
ANSWERS
Why does pressure in magma build up as it rises toward the surface?
(a) More rock above the magma leads to higher pressures.
(b) Higher temperatures lead the magma to expand.
(c) Dissolved gas expands to form gas bubbles.
(d) All the above. - Answer- (c) Dissolved gas expands to form gas bubbles.
How does a stratovolcano form?
(a) By repeated lava flows
(b) By repeated explosive eruptions
(c) By alternating layers of lava and pyroclastic flows
(d) Air cooled lava fragments are thrown out of a vent - Answer- (c) By alternating layers
of lava and pyroclastic flows
True or False: Unlike earthquakes, at least some volcanic eruptions can be predicted a
few days before they occur.
(a) True
(b) False - Answer- (a) True
Which would be the most likely cause of a tsunami to hit the U.S. east coast?
(a) An earthquake
(b) An underwater landslide
(c) An asteroid impact
(d) A volcanic eruption - Answer- (b) An underwater landslide
For the vast majority of the mantle, which is higher, the actual temperature or the
melting temperature?
(a) The actual temperature
(b) The melting temperature - Answer- (b) The melting temperature
What is a harmonic tremor?
(a) A series of earthquakes in the vicinity of a volcano.
(b) Ground shaking caused by the movement of magma beneath the surface.
(c) Ground shaking caused by the eruption of magma out of a volcano.
(d) The expansion of pressure waves caused by a volcanic explosion. - Answer- (b)
Ground shaking caused by the movement of magma beneath the surface.
, What process associated with subduction zone earthquakes causes a tsunami to be
generated?
(a) Elastic rebound
(b) Underwater landslides
(c) Seismic shaking
(d) The opening of a trench on the seafloor - Answer- (a) Elastic rebound
Why is it dangerous to return to the beach after a tsunami wave first arrives and has
already caused damage?
(a) Because a tsunami generally consists of several waves spread out over time.
(b) Because the water makes everything slippery.
(c) Because there are likely to be gas leaks.
(d) Because there is likely to be piles of debris with sharp edges. - Answer- (a) Because
a tsunami generally consists of several waves spread out over time.
What process caused the largest tsunami run-up (the height water reached on land)
recorded in the past 100 years?
(a) A landslide
(b) An earthquake
(c) A volcanic eruption
(d) An asteroid impact - Answer- (a) A landslide
About how many people have tsunamis killed in the past 1000 years?
(a) Thousands
(b) Hundreds of thousands
(c) Millions
(d) Hundreds of millions - Answer- (b) Hundreds of thousands
What killed almost 2000 people in Cameroon in 1986?
(a) An explosive volcanic eruption
(b) A carbon dioxide gas cloud that descended from a volcanic lake
(c) A tsunami from the collapse of a side of an underwater volcano
(d) A mudflow triggered by a volcanic eruption - Answer- (b) A carbon dioxide gas cloud
that descended from a volcanic lake
If a 10-km-diameter asteroid (the size of the one that wiped out the dinosaurs) impacted
in the same place (off of the Yucatan Peninsula) and you lived in Florida, would you
survive the resulting tsunami?
(a) Probably
(b) Probably not - Answer- (b) Probably not
True or False: Volcanic flows can sometimes be stopped by spraying water on them.
(a) True
(b) False - Answer- (a) True
ANSWERS
Why does pressure in magma build up as it rises toward the surface?
(a) More rock above the magma leads to higher pressures.
(b) Higher temperatures lead the magma to expand.
(c) Dissolved gas expands to form gas bubbles.
(d) All the above. - Answer- (c) Dissolved gas expands to form gas bubbles.
How does a stratovolcano form?
(a) By repeated lava flows
(b) By repeated explosive eruptions
(c) By alternating layers of lava and pyroclastic flows
(d) Air cooled lava fragments are thrown out of a vent - Answer- (c) By alternating layers
of lava and pyroclastic flows
True or False: Unlike earthquakes, at least some volcanic eruptions can be predicted a
few days before they occur.
(a) True
(b) False - Answer- (a) True
Which would be the most likely cause of a tsunami to hit the U.S. east coast?
(a) An earthquake
(b) An underwater landslide
(c) An asteroid impact
(d) A volcanic eruption - Answer- (b) An underwater landslide
For the vast majority of the mantle, which is higher, the actual temperature or the
melting temperature?
(a) The actual temperature
(b) The melting temperature - Answer- (b) The melting temperature
What is a harmonic tremor?
(a) A series of earthquakes in the vicinity of a volcano.
(b) Ground shaking caused by the movement of magma beneath the surface.
(c) Ground shaking caused by the eruption of magma out of a volcano.
(d) The expansion of pressure waves caused by a volcanic explosion. - Answer- (b)
Ground shaking caused by the movement of magma beneath the surface.
, What process associated with subduction zone earthquakes causes a tsunami to be
generated?
(a) Elastic rebound
(b) Underwater landslides
(c) Seismic shaking
(d) The opening of a trench on the seafloor - Answer- (a) Elastic rebound
Why is it dangerous to return to the beach after a tsunami wave first arrives and has
already caused damage?
(a) Because a tsunami generally consists of several waves spread out over time.
(b) Because the water makes everything slippery.
(c) Because there are likely to be gas leaks.
(d) Because there is likely to be piles of debris with sharp edges. - Answer- (a) Because
a tsunami generally consists of several waves spread out over time.
What process caused the largest tsunami run-up (the height water reached on land)
recorded in the past 100 years?
(a) A landslide
(b) An earthquake
(c) A volcanic eruption
(d) An asteroid impact - Answer- (a) A landslide
About how many people have tsunamis killed in the past 1000 years?
(a) Thousands
(b) Hundreds of thousands
(c) Millions
(d) Hundreds of millions - Answer- (b) Hundreds of thousands
What killed almost 2000 people in Cameroon in 1986?
(a) An explosive volcanic eruption
(b) A carbon dioxide gas cloud that descended from a volcanic lake
(c) A tsunami from the collapse of a side of an underwater volcano
(d) A mudflow triggered by a volcanic eruption - Answer- (b) A carbon dioxide gas cloud
that descended from a volcanic lake
If a 10-km-diameter asteroid (the size of the one that wiped out the dinosaurs) impacted
in the same place (off of the Yucatan Peninsula) and you lived in Florida, would you
survive the resulting tsunami?
(a) Probably
(b) Probably not - Answer- (b) Probably not
True or False: Volcanic flows can sometimes be stopped by spraying water on them.
(a) True
(b) False - Answer- (a) True
