Which of the following terms is not a compositional name for a lava type?
Felsic
Intermediate
Mafic
Viscosity
The Hawaiian Islands are actually the tops of which broad, dome-shaped type of volcano?
Composite cone volcano
Cinder cone volcano
Shield volcano
Stratovolcano
Volcanic gases are initially brought to the earth's surface as _____.
they dissolve through the outer walls of the volcano.
magma burns through pockets of gas
they are dissolved in magma.
volcanoes superheat vegetation on volcanoes
Which of the following terms describes a low-density flow of volcanic material with a higher proportion of gas to rock?
Ignimbrites
Lava plateau
Pyroclastic surge
Nuees Ardentes
Which of the following is NOT found inside a volcano?
Volcanic pipe
Lava plateau
Magma
Magma chamber
Which of the following terms is used to describe hot molten rock from deep within the earth?
Magma
Cinders
Core lava
Lava
What is the name given to an area of the Pacific Ocean Basin that is tectonically active?
Tsunami
The Pyroclastic Ring
The Ring of Fire
Debris Field
Which type of volcano is comprised of layers of lava, ash and rock debris?
Shield volcano
Composite cone volcano
Pyroclastic volcano
Cinder cone volcano
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 lahar
A tephra flow
A debris flow
A tsunami
If the debris within a landslide mixes with enough water it can trigger which of the following volcanic hazards?
A tsunami
A pyroclastic flow
A pyroclastic surge
A lahar
Which lava compositional type has the lowest silica and highest magnesium concentration?
Intermediate
Felsic
Mafic
Pahoehoe
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?
Lava dome
Lava plateau
Fissure
Caldera
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
Lava
Magma
Pumice
What lava morphology is not associated with mafic lavas?
Blocky
Pillow
'a'a
Pahoehoe
Which of the following gases, released during a volcanic eruption, contributes to acid rain?
Hydrogen sulfide
Carbon monoxide
Sulfur dioxide
Water vapor
Which type of volcano is built from glassy lava fragments that explode from the volcano and cool quickly?
Composite cone volcano
Shield volcano
Cinder cone volcano
Stratovolcano
Why are pyroclastic flows so dangerous?
They can travel at high speeds
They contain fiery fragments
They contain toxic gases
All of the answers are correct
Which term for a small volcanic rock is a Latin word that means little stones?
Lapilli
Pyroclastic
Ignimbrites
Pumice
Which of the following terms describes rock fragments and other particles ejected from a volcano?
Lava
Lahar
Blocks
Tephra
Which of the following lava characteristics greatly affect the viscosity of a lava?
Magnesium concentration
Silica concentration
Eruption location
Type of volcano
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.
Hydrogen sulfide
Methane
Carbon dioxide.
Hydrochloric acid