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#2
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100
What are the smallest lava fragments?
What is ash
100
A volcano that is erupting or may erupt very soon is?
What is active
100
A volcano that may erupt some time in the distant future is?
What is dormant
100
Before lava reaches the surface, the molten material is called what?
What is magma
100
What is a cone-shaped mountain in which lava layers alternate with layers of ash?
What is composite volcano
200
What is the volcano that builds ash, cinders and bombs in a steep pile?
What is a cinder cone
200
What is the bowl shaped area around a volcano's central vent?
What is a crater
200
What is a major volcanic belt that circles the Pacific ocean?
What is the Ring of Fire
200
Give an example of a place where there is a hot spot
What is the Hawaiian Islands, Old Faithful
200
Where do volcanic belts form?
What is along the boundaries of Earth's plates
300
A main hazard from a quiet eruption is?
What is lava flows or fires
300
When does a pyroclastic flow occur?
What is during a explosive eruption.
300
What is a long tube in the ground that connects the magma chamber to Earth's surface?
What is the pipe
300
If viscosity is high, how does the lava flow?
What is slowly
300
In volcanic areas, groundwater heated by magma is a source of what?
What is geothermal energy
400
When groundwater is heated by magma and rises to the surface and collects in a natural pool, what is this called?
What is a hot spring
400
The major ingredient in magma is?
What is dissolved gasses
400
Which of the following helps to determine how easily magma flows?
What is the amount of silica in the magma
400
A huge hole left by the collapse of a volcanic mountain is called a what?
What is a caldera
400
If geologists detect many small earthquakes in the area near a volcano, what can they infer?
What is it is probably about to erupt
500
What is the landform that forms when a mass of hardened magma is uplifted, causing layers of rock to bend upward?
What is a dome mountain
500
The viscosity of magma depends on what two things?
What is temperature and silica content
500
If If a vocano's magma is high in silica, the volcano will probably do what?
What is erupt explosively
500
A mass of rock formed when a large body of magma cools inside the crus tis called what?
What is batholith
500
What provides the force that causes magma to erupt to the surface?
What is gases trapped in the magma
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