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