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What provides the force that causes magma to erupt to the surface?
dormant
volcanic ash
upward movement of magma
pyroclastic flow
dissolve gases trapped in the magma
pumice
lava flows
It is probably about to erupt
Which type of rock would you expect to form as a result of an explosive eruption?
dormant
volcanic ash
upward movement of magma
pyroclastic flow
dissolve gases trapped in the magma
pumice
lava flows
It is probably about to erupt
The main hazard from a quiet volcanic eruption is
dormant
volcanic ash
upward movement of magma
pyroclastic flow
dissolve gases trapped in the magma
pumice
lava flows
It is probably about to erupt
A volcano that may erupt again at some time in the distant future is
dormant
volcanic ash
upward movement of magma
pyroclastic flow
dissolve gases trapped in the magma
pumice
lava flows
It is probably about to erupt
What triggers the small earthquakes that occur around a volcanic eruption?
dormant
volcanic ash
upward movement of magma
pyroclastic flow
dissolve gases trapped in the magma
pumice
lava flows
It is probably about to erupt
If geologists detect many small earthquakes in the area near a volcano, what can they infer?
dormant
volcanic ash
upward movement of magma
pyroclastic flow
dissolve gases trapped in the magma
pumice
lava flows
It is probably about to erupt
An eruption of ash, cinders, bombs and gases from a volcano is called
dormant
volcanic ash
upward movement of magma
pyroclastic flow
dissolve gases trapped in the magma
pumice
lava flows
It is probably about to erupt
Which of the following volcano hazards is made up of rocky particles about the size of a grain of sand?
dormant
volcanic ash
upward movement of magma
pyroclastic flow
dissolve gases trapped in the magma
pumice
lava flows
It is probably about to erupt
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