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A large, flat area covered by lava
lava plateau
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a small volcano; usually erupts only for a short time
cinder cone volcano
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a funnel-shaped pit
crater
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created by a combination of explosive and nonexplosive eruptions
composite volcano
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a tiltmeter is an instrument that measures__________
changes in a volcano's slope
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which category of volcano will most likely erupt in the near future?
an active volcano
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volcanoes far from tectonic plate boundaries are know as___
hot spots
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Why is an oceanic plate more likely to be subducted that a continental plate?
it is more dense and thin
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where do most active volcanoes form?
where plates collide
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What happens to rock when temperature increases and pressure decreases?
rock melts
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when the roof of a magma chamber collapses and a depression is created, what is it called?
caldera
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Name the 3 main types of volcanoes.
cinder cone, composite, shield
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what is formed when magma explodes into the air and hardens?
pyroclastic material
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little stones is a name given to which type of pyroclastic material
lapilli
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lava that forms heaps of sharp chunks
blocky lava
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lava that looks like dripping wax
pahoehoe lava
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how the lava flows
viscosity
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what type of explosion is likely to occur if the water content of magma is high?
explosive
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If lava has a low silica content, is the flow slow or is it runny?
runny
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underground, molten rock usually gathers in a __________
magma chamber
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in a nonexplosive eruption, what would you expect to see?
large amounts of lava flow
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According to Scientist, where are volcanoes likely to occur?
plate boundaries
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A vent or fissure in the Earth's surface where magma and gases are expelled is called_______________
a volcano
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