A large rounded slightly sloped volcano that usually forms over hot spots.
What is a shield volcano?
100
When an eruption occurs at a cindercone volcano the materials spewed out will be mostly this.
What is ash and rock fragments?
100
Volcanoes that are layered from multiple volcanic eruptions are called this.
What is composite?
100
A weakness found in a plate that can produce volcanic activity is refered to as this.
What is a hot spot?
100
A rift valley with seafloor spreading may occur along this palte boundary.
What is divergent?
200
Lava does not always flow to the summit of the volcano during an eruption, sometimes it may flow from these.
What are cracks or fissures?
200
These volcanoes are created mostly from ash and rock fragments forced into the sky and then striaght back down forming steep slopes.
What is a cindercone volcano?
200
Composite volcanoes are typically composed of this type of lava.
What is Rhyolitic ?
200
Hot spots can produce volcanic island chains such as this one in the middle of the Pacific.
What is Hawaii?
200
The weakest eruptions and the least volcanic activity typically occur along this boundary.
What is divergent?
300
Shield volcanoes are often created from this type of magma.
What is basaltic magma?
300
At the top of a volcano there can be a collapse of hardened volcanic rock creating a bowl shape called this.
What is caldera?
300
Composite volcanoes are particularly dangerous because of a superheated cloud of gas produced during an eruption called this.
What is pyroclastic flow?
300
These types of volcanoes are typically associated with hot spots.
What are shield volcanoes?
300
Composite volcanoes are most likely to form along this type of plate boundary?
What is subduction?
400
Basaltic lava that flows from a shield volcano will typically flow long distances until it hits this.
What is an ocean?
400
When volcanic magma hardens it can become jagged and rough, and this would signify this type of volcanic rock.
What is aa?
400
Most composite volcanoes that form along subduction boundaries produce explosive eruptions featuring these 3 materials.
What are lava, ash, and gas or pyroclastic materials?
400
Hot spots under shield volcanoes typically produce this type of lava.
What is basaltic?
400
The 2 types of volcanoes that are most commonly associated with subduction boundaries are these.
What is composite and cindercone?
500
Sometimes the tops of volcanoes are covered with snow and ice, but during a volcanic eruption it may melt quickly creating these.
What are lahars?
500
This type of magma is usually associated with cindercone volcanoes.
What is andesitic magma?
500
An example of composite volcano that erupted in Washington state in 1980 with devastating effects is called.
What is Mount Saint Helens?
500
Volcanic island chains like Hawaii are created by hot spots because this lithospheric occurance.
What is plate tectonics or plate movement?
500
This process causes a composite volcanoe to erupt at a oceanic-continental subduction boundary.
What is the water falls into the subduction boundary lowering the melting temperature of the crust creating magma. The magma rises due the decrease in density building pressure underneath the volcano. The pressure builds until it is relaeased in an explosive volcanic eruption?