Volcanic belts form along the boundaries of Earth's ________.
What are plates?
100
Opening through which molten rock and gas leave a volcano?
What is a vent?
100
This volcano is tall, cone-shaped, and made up of alternating layers of lava and ash.
What is a composite volcano?
100
A slab of volcanic rock formed when magma squeezes between layers of rock.
What is sill?
100
If geologists detect many small earthquakes in the area near a volcano, what can they infer about the volcano? (Active, dormant, or extinct)
What is active?
200
A volcano is a __________ that forms in Earth's crust when molten material reaches the surface.
What is a mountain?
200
Fill in the blank: Geologists classify volcanic eruptions as quiet or ________.
What is explosive?
200
Repeated floods of molten material can form high, level plateaus called _______ plateaus.
What is lava?
200
A major belt of volcanoes that rims the Pacific Ocean.
What is the Ring of Fire?
200
When magma hardens in a volcano's pipe, the result will eventually be a landform called a _______.
What is a volcanic neck?
300
This is forming when melted material in the crust erupts and reaches the surface.
What is a hot spot?
300
A volcano erupts quietly if its magma is _______ in silica.
What is low?
300
Shield volcanoes, cinder cone volcanoes, composite volcanoes, and lava plateaus are all examples of landforms created by__________.
What is lava?
300
A material found in magma that is formed from the elements oxygen and silicon; it is the primary substance of Earth's crust and mantle.
What is silica?
300
The main hazard from a quiet volcanic eruption is ________.
What is lava flows?
400
Fill in the blank: Volcanoes form along the mid-ocean ridges, where two plates move ______.
What is apart?
400
Volcano that is currently erupting is called an ______ volcano.
What is active?
400
Dikes and sills are two examples of landforms created when ____ forces its way through cracks in the upper crust.
What is magma?
400
A mass of rock formed when a large body of magma cools inside the crust.
What is batholith?
400
The main factor that accounts for the difference between quiet and explosive volcanic eruption is...
A- the size of the volcano's magma chamber
B- the iron content of the magma
C- the age of the volcano
D- the silica content of the magma
What is (D) the silica content of the magma?
500
This national park marks the location of a huge hot spot.
What is Yellowstone?
500
Pocket of magma beneath the surface.
What is a magma chamber?
500
Landform on which a caldera is least likely to form on.
What is a lava plateau?
500
The flow of ash, cinders, bombs, and gases down the side of volcano during an explosive eruption.
What is pyroclastic flow?
500
What provides the force that causes magma to erupt to the surface?
A- silica in the magma
B- dissolved gases trapped in the magma
C- gravity in the lithosphere
D- the density of the magma
What is (B) dissolved gasses trapped in the magma?