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
Pumice
Lava
Magma
Why are pyroclastic flows so dangerous?
They can travel at high speeds
All of the answers are correct
They contain toxic gases
They contain fiery fragments
Which of the following terms describes a low-density flow of volcanic material with a higher proportion of gas to rock?
Lava plateau
Ignimbrites
Nuees Ardentes
Pyroclastic surge
Which of the following terms is not a compositional name for a lava type?
Viscosity
Felsic
Intermediate
Mafic
Which of the following lava characteristics greatly affect the viscosity of a lava?
Type of volcano
Silica concentration
Magnesium concentration
Eruption location
Which lava compositional type has the lowest silica and highest magnesium concentration?
Mafic
Intermediate
Pahoehoe
Felsic
Volcanic gases are initially brought to the earth's surface as _____.
they are dissolved in magma.
magma burns through pockets of gas
they dissolve through the outer walls of the volcano.
volcanoes superheat vegetation on volcanoes
Which of the following gases, released during a volcanic eruption, contributes to acid rain?
Carbon monoxide
Hydrogen sulfide
Sulfur dioxide
Water vapor
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.
Methane
Hydrogen sulfide
Hydrochloric acid
Carbon dioxide.
Which of the following terms describes rock fragments and other particles ejected from a volcano?
Tephra
Lahar
Lava
Blocks
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
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 type of volcano is comprised of layers of lava, ash and rock debris?
Cinder cone volcano
Shield volcano
Composite cone volcano
Pyroclastic volcano
The Hawaiian Islands are actually the tops of which broad, dome-shaped type of volcano?
Cinder cone volcano
Composite cone volcano
Stratovolcano
Shield volcano
Which of the following terms is used to describe hot molten rock from deep within the earth?
Cinders
Lava
Magma
Core 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
