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The Cascade range, including Mount St. Helens and Mt. Rainier, are the result from __________.
continent-continent collision
heat generated by friction along the San Andreas fault
the subduction of the Juan de Fuca plate beneath North America
the subduction of the Pacific plate beneath North America
the subduction of the Juan de Fuca plate beneath North America
True or False: Volcanoes classified as VEI-5 occur more often than volcanoes classified as VEI-3.
False
True or False: The most dangerous volcanoes tend to be in the same general plate-tectonic settings as the largest earthquakes in the world.
True
The eruption of Mount St. Helens, in May of 1980, if best known for its __________.
fumaroles
lateral blast
tsunami
peaceful fissure eruptions
effusive lava flows
lateral blast
(A) __________ is a volcanic hazard associated with clouds of hot gasses, mixed with ash and other fragments.
volcanic ash
lahar
lava flow
pyroclastic flow
pyroclastic flow
Which of the following are potential causes of deaths from a volcanic eruption?
Poisonous gasses
Pyroclastic flows
Tsunami
Lahars
All of these choices are correct.
All of these choices are correct.
Which of the following is NOT a scientific way to predict volcanic eruptions?
Increased earthquake activity
Changes in the shape of the volcano
Increase in gas emissions
Check the weather
Check the weather
(A) __________ is a volcanic hazard associated with the mixture of volcanic debris, ash, and water.
lahar
lava flow
pyroclastic flow
volcanic ash
lahar
Mt. Rainier, in Washington, is the most dangerous volcano in the United States because of its __________.
active geothermal activity (for example, hot springs and fumaroles)
All of these choices are correct
extensive glacial cap
frequent earthquakes
great height
All of these choices are correct
The 2018 Leilani Estates eruption in Hawaii is best classified as a __________.
fissure eruption
pyroclastic flow
fumarole
lahars
supervolcano eruption
fissure eruption
The presence of water __________ the melting point of the rock.
lowers
does not change
raises
may raise or lower
lowers
The two most active volcanoes in the Cascade Range, over the past 4,000 years are __________.
Mt. Shasta and Mt. Jefferson
Lassen Peak and the Three Sisters
Mt. St. Helens and Mt. Shasta
Mt. Rainier and Mt. Adams
Mt. Baker and Mt. Hood
Mt. St. Helens and Mt. Shasta
