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Nature of Volcanic Eruptions
Types of Volcanoes
Intrusive Igneous Activity
Plate Tectonics and Igneous Activity
100
This term describes lava’s resistance to flow
What is viscosity?
100
A steep-walled depression located at the summit of a volcano
What is a crater?
100
These two types of plutons are formed when magma is intruded close to the surface
What are sills and laccoliths?
100
This provides the mechanism by which mantle rocks melt and magma is produced
What are plate motions?
200
The opening of a volcano that leads to the surface
What is the vent?
200
This type of volcano is a large, nearly symmetrical structure that is most commonly associated with volcanoes
What is a composite cone?
200
This type of plutons are formed when magma is injected into fractures, cutting across preexisting rock layers
What are dikes?
200
Most magma is produced along these types of boundaries
What are divergent plate boundaries?
300
This is the name given to particles produced in volcanic eruptions
What is pyroclastic material?
300
This type of volcano has the shape of a broad, slightly domed structure and is the largest type of volcano on Earth
What is a shield volcano?
300
This type of intrusive igneous body has a surface exposure greater than 100 square kilometers
What is a batholith?
300
Volcanic activity that occurs within a plate and not at a plate boundary is referred to as this
What is intraplate volcanism?
400
This volcano erupted in the United States on May 18, 1980
What is Mount St. Helen?
400
This type of volcano is simple and usually small because of its short lifespan
What is a cinder cone?
400
This is the term given to the rate at which temperature changes with depth below Earth’s surface
What is geothermal gradient?
400
This is Earth’s most active volcano located in Hawaii
What is Kilauea?
500
What 3 factors determine how violently a volcano will erupt?
What are magma composition, temperature, and amount of gases?
500
A wide area that forms when low-viscosity basaltic lava flows from fissures
What is a lava plateau?
500
This element causes rock to melt into magma at a lower temperature
What is water?
500
Most magma is produced during seafloor spreading along these structures
What are oceanic ridges?