Volcanoes and Plate Tectonics
Volcanic Eruption
Volcanic landform
More volcanoes
True or false
100
When magma reaches the surface it is called
What is lava
100
Where magma leaves a volcano is called
What is a vent
100
When a volcano erupts quietly, what kind of mountain forms
What is a shield volcano
100
Sometimes volcanic ash and debris rush down the side of a volcano. This is called a ____________________.
pyroclastic flow
100
Which type of rock would you expect to form as a result of an explosive eruption a. pahoehoe b. pillow lava c. pumice d. blocky lava
C. pumice
200
What type of volcanoes formed the Hawaiian islands
What are hot spot volcanoes
200
An explosive eruption occurs if magma is
What is high in silica (or is under a lot of pressure)
200
The bowl shaped depression around a volcano's vent is the __________________.
crater
200
What kind of lava is thin and runny
What is pahoehoe
200
A quiet eruption may produce quick flowing lava that hardens to form jagged rock. What type of lava is this?
aa
300
What is a weak spot where magma comes to the surface is called
What is a volcano
300
What is a volcano that no longer erupts but is likely to erupt in the future
What is dormant
300
What is a hole left behind when land around a volcano collapses
What is caldera
300
What two factors control whether an eruption will be quiet or explosive?
The amount of water vapor and other trapped gases and how much silica is present in the magma (the viscosity)
300
Layers of thin, runny lava build up a flat, high, level area. This area is called a
lava plateau
400
What is the major volcanic belt the rims the Pacific Ocean
What is the Ring of Fire
400
Inside a volcano, magma collects in a pocket called this.
magma chamber
400
What kind of volcano has ash,cinder and bombs
What is a cinder cone volcano and composite volcano
400
A volcano that is made of alternating layers of pyroclastic material and lava is a _________________ volcano.
composite
400
If the magma chamber beneath a composite volcano empties then collapses, what feature will form
caldera
500
This is what happens to oceanic crust when it converges on continental crust
What is subduction
500
An area where magma melts through the crust in the middle of a plate.
hot spot
500
What kind or kinds of eruptions dose a composite volcano have
What are quiet and explosive eruptions (alternating)
500
Volcanoes that occur along a mid-ocean ridge occur at what type of boundary?
divergent
500
What are some signs that a volcano may be erupting soon?
Gas produced, changing shape, earthquakes
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