Intro to Volcanoes
Types of Volcanoes
Magma Composition
Volcanic Materials
Locations of Volcanoes
100
A mountain that has been built up over a long period of time from repeated eruptions.
What is a volcano?
100
A broad, dome-shaped volcano such as those found in Hawaii.
What is a Shield volcano?
100
Magma's viscosity is directly related to how much of this it contains.
What is silica?
100
These are particles produced in volcanic eruptions.
What are pyroclastic materials?
100
A belt forming a "ring-like" shape around the Pacific Ocean basin in which most active volcanoes are found.
What is the Ring of Fire?
200
Molten rock found beneath the Earth's surface.
What is magma?
200
A volcano with slopes that are made entirely of ejected lava fragments?
What is a Cinder cone volcano?
200
A volcanic eruption will either be violent or quiet based on these three factors.
What are the amount of dissolved gases, temperature, and composition of the magma?
200
Lava with a smooth surface that cools to form "ropey" or "pillowy" shapes.
What is pahoehoe lava?
200
Most composite volcanoes are found at oceanic-continental types of these plate boundaries.
What are convergent plate boundaries?
300
Molten rock or magma that has reached the Earth's surface.
What is lava?
300
A volcano made of both lava and pyroclastic deposits famous for violent eruptions.
What is a Composite cone volcano?
300
If temperature increases, viscosity will _____.
What is decrease?
300
Lava with rough, jagged blocks and sharp, angular projections.
What is aa lava?
300
A mantle plume rising towards the Earth's surface through a tectonic plate.
What is intraplate volcanic activity?
400
These are the two main conditions needed for magma to form. (Rock composition is the third condition).
What are heat and pressure?
400
The large depression found at the top of a volcano formed from the collapse of the roof of the magma chamber?
What is a caldera?
400
Shield volcanoes have quiet eruptions due to these three factors related to their magma composition.
What is magma with low silica, low viscosity, and low gas content?
400
A fast-moving incandescent cloud of volcanic particles and gases.
What is a pyroclastic flow?
400
This is a nickname for areas of intraplate volcanism.
What are "hot spots?"
500
Another name for an inactive volcano.
What is dormant?
500
Composite volcanoes have violent eruptions due to these three factors related to their magma composition.
What is high silica, high viscosity, and high gas content?
500
A destructive mudflow formed from the melting of snow or glacial ice on an erupting volcano.
What is a lahar?
500
These volcanoes tend to grow from the ocean floor to form islands.
What are shield volcanoes?
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