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| Final Question | ||||
The landforms that we call volcanoes are created by
The landforms that we call volcanoes are created by
repeated eruptions of lava.
What is the pyroclastic material that can reach the upper atmosphere and circle the Earth for years called?
What is the pyroclastic material that can reach the upper atmosphere and circle the Earth for years called?
volcanic ash
The volcanoes of Hawaii and other places far from tectonic plate boundaries are known as ________.
The volcanoes of Hawaii and other places far from tectonic plate boundaries are known as ________.
hot spots
What type of lava flows slowly and has a glassy surface?
What type of lava flows slowly and has a glassy surface?
pahoehoe lava
When infrared images show that an area is getting hotter, what is probably happening there?
When infrared images show that an area is getting hotter, what is probably happening there?
Magma is rising in an active volcano.
How does pillow lava form?
How does pillow lava form?
when lava erupts under water.
Cool, stiff lava that forms jumpled heaps of sharp chunks near the vent is called
Cool, stiff lava that forms jumpled heaps of sharp chunks near the vent is called
blocky lava
What kind of volcano is most likely to erupt soon?
What kind of volcano is most likely to erupt soon?
an active volcano
When you talk about the viscosity of lava, you are talking about
When you talk about the viscosity of lava, you are talking about
how the lava flows
What is the relationship between temperature and pressure in order for rock to begin to melt and form magma?
What is the relationship between temperature and pressure in order for rock to begin to melt and form magma?
temperature increases and pressure decreases
How are volcanoes created?
How are volcanoes created?
by many eruptions of lava
What are the three main types of volcanoes?
What are the three main types of volcanoes?
shield, composite, and cinder cone
A combination of explosive and nonexplosive eruptions will create a _________.
A combination of explosive and nonexplosive eruptions will create a _________.
composite volcano
A large depression that forms when the magma chamber partially empties is a ___________.
A large depression that forms when the magma chamber partially empties is a ___________.
caldera
What is a tiltmeter?
What is a tiltmeter?
an instrument that measures changes in a volcano’s slope
Where are volcanoes most likely to form?
Where are volcanoes most likely to form?
along plate boundaries
Only about 5% of volcanoes on land form _________.
Only about 5% of volcanoes on land form _________.
in hot spots
Describes a climate change caused by a volcanic eruption.
Describes a climate change caused by a volcanic eruption.
Ash blocks sunlight, causing temperatures to drop.
Describes subduction.
Describes subduction.
. movement of one tectonic plate under another
Lava that is very runny probably has what component?
Lava that is very runny probably has what component?
has a low silica content
Which kind of volcano will probably never erupt again?
Which kind of volcano will probably never erupt again?
an extinct volcano
Where do most active volcanoes form?
Where do most active volcanoes form?
where tectonic plates collide
What would you expect after an explosive eruption?
What would you expect after an explosive eruption?
darkened skies
What would you expect to see during a nonexplosive eruption?
What would you expect to see during a nonexplosive eruption?
huge lava flows
When an oceanic plate collides with a continental plate, the oceanic plate is usually subducted. Why?
When an oceanic plate collides with a continental plate, the oceanic plate is usually subducted. Why?
oceanic crust is denser and thinner than continental crust
What is the name of the volcano in Mexico that grew out of a corn field?
What is the name of the volcano in Mexico that grew out of a corn field?
Paricutin
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