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200
The long tube that connects the magma chamber to the Earth's surface is called....
What is the pipe.
200

Thin, runny lava produces _________ volcanoes.

What is shield.

200

_________ trapped in the magma under pressure provide the force for most volcanic eruptions.

What is gases.

200
Hardened magma that remains in the pipe when softer material wears away is called ...
What is a volcanic neck.
200
The main hazard that comes from a quiet volcanic eruption would be...
What is the lava flow.
400

If geologists detect many small earthquakes in the area near a volcano, they may infer that it is ...

What is "probably about to erupt"?

400

When the walls of a volcano collapse in on itself down into the magma chamber, this creates a _________.

What is a caldera?

400

The lava that forms from fast moving lava that is thin, runny, and forms rope-like coils when it cools is known as ___________.

What is Pahoehoe?

400
Magma that forces its way "across" the rock layers hardens to form a _______.
What is dike.
400
A string of islands that form because of the collision of two oceanic plates is known as ...
What is an island arc.
600

The smallest particles that are created by a volcanic eruption are known as _________.

What is ashes.

600

Volcanoes made of primary ash, cinders and bombs are known as _______ volcanoes.

What is a cinder cone volcano?

600

During a quiet eruption, lava flows very _________ and will ________ everything in it's path.

What is "slowly" and "burn"?

600
Magma that "squeezes" between the horizontal layers of rock forms a ________.
What is sill.
600
The bowl shaped area that is around the volcano's central vent is known as....
What is the crater.
800

If a volcano has magma that is very high in silica, it will probably have a(n) ___________ eruption.

What is explosive?

800

Alternating layers of lava flows and pyroclastic debris create ___________ volcanoes.

What is composite.

800
Pyroclastic flows usually occur during a(n) _________ eruption.
What is explosive.
800
A large mass of rock that forms from cooled magma inside the crust is called a(n) ______________.
What is batholith.
800
Define a lava plateau.
What is when layers of thin, runny lava build up a high level area.
1000

T/F - A volcano that may be smoking and but is only producing small earthquakes, may be dormant.

What is false?  Any signs of volcanic activity make it an active volcano

1000
Cooler lava that moves slowly and hardens into rough chunks is known as _____.
What is Aa.
1000
In what location would you MOST likely find volcanoes?
What is along mid-ocean ridges where a plate is subducted.
1000

This is the general term for ANY rock formation formed when magma hardens beneath the earth.

What is a Pluton?  And for an extra 200 points for whom was it named?

1000
Mountains that are formed by volcanoes along a coastline occur at ______________.
What is converging plate boundaries.