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