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Which type of volcano is built from glassy lava fragments that explode from the volcano and cool quickly?
 
Cinder cone volcano
 
Shield volcano
 
Composite cone volcano
 
Stratovolcano
What lava morphology is not associated with mafic lavas?
 
Blocky
 
Pahoehoe
 
'a'a
 
Pillow
Which term for a small volcanic rock is a Latin word that means little stones?
 
Lapilli
 
Ignimbrites
 
Pumice
 
Pyroclastic
Which of the following is NOT found inside a volcano?
 
Lava plateau
 
Magma
 
Magma chamber
 
Volcanic pipe
Mount St. Helens in Washington state is known for its massive volcanic eruption that occurred in 1980. The eruption left a mile wide horseshoe-shaped crater. How would a volcanologist classify this structure?
 
Caldera
 
Lava dome
 
Fissure
 
Lava plateau
What is the name given to an area of the Pacific Ocean Basin that is tectonically active?
 
The Ring of Fire
 
Debris Field
 
Tsunami
 
The Pyroclastic Ring
Which of the following terms is used to describe hot molten rock from deep within the earth?
 
Magma
 
Cinders
 
Core lava
 
Lava
The Hawaiian Islands are actually the tops of which broad, dome-shaped type of volcano?
 
Shield volcano
 
Cinder cone volcano
 
Stratovolcano
 
Composite cone volcano
Which type of volcano is comprised of layers of lava, ash and rock debris?
 
Composite cone volcano
 
Shield volcano
 
Pyroclastic volcano
 
Cinder cone volcano
If the debris within a landslide mixes with enough water it can trigger which of the following volcanic hazards?
 
A lahar
 
A pyroclastic flow
 
A tsunami
 
A pyroclastic surge
Which of the following terms is used to describe a series of large ocean waves caused by an abrupt disturbance, such as a landslide?
 
A tsunami
 
A debris flow
 
A tephra flow
 
A lahar
Which of the following terms describes rock fragments and other particles ejected from a volcano?
 
Tephra
 
Lahar
 
Blocks
 
Lava
Gas X is produced during volcanic eruption and is also known as a greenhouse gas. It is heavier than air and tends to accumulate in low-lying areas. This accumulation can be fatal. Identify Gas X.
 
Carbon dioxide.
 
Methane
 
Hydrogen sulfide
 
Hydrochloric acid
Which of the following gases, released during a volcanic eruption, contributes to acid rain?
 
Sulfur dioxide
 
Carbon monoxide
 
Water vapor
 
Hydrogen sulfide
Volcanic gases are initially brought to the earth's surface as _____.
 
they are dissolved in magma.
 
volcanoes superheat vegetation on volcanoes
 
they dissolve through the outer walls of the volcano.
 
magma burns through pockets of gas
Which lava compositional type has the lowest silica and highest magnesium concentration?
 
Mafic
 
Felsic
 
Intermediate
 
Pahoehoe
Which of the following lava characteristics greatly affect the viscosity of a lava?
 
Silica concentration
 
Eruption location
 
Type of volcano
 
Magnesium concentration
Which of the following terms is not a compositional name for a lava type?
 
Viscosity
 
Felsic
 
Mafic
 
Intermediate
Which of the following terms describes a low-density flow of volcanic material with a higher proportion of gas to rock?
 
Pyroclastic surge
 
Nuees Ardentes
 
Lava plateau
 
Ignimbrites
Why are pyroclastic flows so dangerous?
 
All of the answers are correct
 
They contain toxic gases
 
They can travel at high speeds
 
They contain fiery fragments
What is the term used to describe a dense collection of fragments and gases from a volcanic eruption that flows down the slope of volcano?
 
Pyroclastic flow
 
Magma
 
Lava
 
Pumice
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