Weekly Quiz #4

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