Volcanic Eruption Materials
VOLCANIC ERUPTIONS II
VOLCANIC ERUPTIONS
VOLCANO TYPES
VOLCANIC FORMATIONS
100
Before lava reaches the surface, the molten material is called
What is Magma?
100
A quiet eruption may produce slow moving, cooler lava that hardens to form rough chunks
What is block lava?
100
A volcano that may erupt again sometime in the distant future
What is Dormant?
100
The formation of the Hawaiian islands is one example of
What are HOT SPOTS?
100
These two volcano types are formed at subduction zones
What are Cinder Cone and Stratovolcano?
200
Pyroclastic material that can reach the upper atmosphere and circle the Earth for years
What is ash?
200
The Krafts were killed by this type of eruption (remember the video)
What is a pyroclastic flow?
200
If the volcano 's magma is high in silica, the volcano will probably
What is erupt explosively?
200
This category of volcano has broad flanks and quiet eruptions
What are shield volcanoes?
200
This chain of islands formed over a stationary hot spot as the tectonic plate moved
What is Hawaii?
300
The major ingredient in magma
What is silica?
300
An eruption of this type is initiated by high gas magma and can launch football sized pyroclasts
What is Vulcanian?
300
Lava that is runny (and low in silica) will lead to this kind of eruption
What is a quiet eruption?
300
The three main types of volcanoes
What are cinder cone, composite and shield?
300
This forms when magma forces itself between rock layers and hardens
What is a sill
400
These are superheated mudflows
What are lahars?
400
A pyroclastic flow usually occurs in a _________ eruption
What is explosive?
400
The bowl shaped area around a volcan's central vent is called a
What is crater
400
Groundwater heated by a nearby body of magma can spray from the ground under pressure, forming
What is a geyser
400
Molten rock gathers underground often gathers in these formations
What are magma chambers?
500
This type is fast-moving hot lava that has a ropey appearance
What is pahoehoe?
500
A volcano on this island country threw out bus sized pyroclasts (bombs)
What is Iceland?
500
An instrument used to detect seismic activity leading up to an eruption
What is a seismograph?
500
A steep sided volcano that is made up of layers of ash and lava
What is a composite volcano?
500
If the magma chamber beneath a composite volcano empties then collapses, what feature will form
What is a caldera
M
e
n
u