Volcanoes and Plates
Parts of a Volcano
Eruptions
Vocabulary
Misc
100
area around the Pacific Ocean that includes many volcanoes
What is the Ring of Fire?
100

The long tube that connects the magma below the crust to the top of the volcano

What is the main vent?

100

This causes magma to rise through the mantle and crust

What is lower density?

100

Resistance to flow

What is viscosity?

100
Type of volcano that forms from alternating layers of ash and lava
What is a Composite Volcano?
200
Volcanoes can form when two plates pull apart at this type of boundary
What is Divergent?
200
The pocket of molten material beneath a volcano
What is a Magma Chamber?
200
This type of eruption has a low silica content
What is Quiet Eruption?
200

A flowy type of lava with a smooth or rope-like appearance

What is pahoehoe?

200
Mt. St. Helens erupted in this year

What is 1980

300
This is an area, not on a plate boundary, where magma makes its way to the surface
What is a Hot Spot?
300
The bowl shaped top of a volcano
What is a Crater?
300

This is what causes magma to be pushed out of a volcano

What is Pressure (from gases)?

300

Solid matter ejected from a volcano named for "fire fragments"

What is pyroclast?

300
What is the main goal of volcanologists?

What is to save lives?

400

When two plates collide to form volcanoes, one is pushed under which is known as ___________________

What is a subduction zone?

400
The area where magma exits on the side of the volcano
What is a Side Vent?
400

A fast moving area of hot gases, ash, and rock

What is Pyroclastic Flow?

400

A deep crack that forms between two divergent plates

What is a rift?

400

A larger version of a crater, created by a volcano collapsing in on itself.

What is a Caldera?

500
When two oceanic plates collide and produce volcanoes, these can be formed
What is an Island Arc?
500
The spread of molten material as it pour out of a vent
What is a Lava Flow?
500
This type of lava forms jagged edges when it cools slowly
What is Aa?
500

An instrument used by volcanologists to measure deformations in the earth's surface.

What is a tiltmeter

500

Two factors that determine what kind of lava a volcano has

What are viscosity and temperature?

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