This is the magma that flows out onto the Earth's surface.
What is lava?
100
The three kinds of mountains created by the eruptions of volcanoes.
What are Cindercone, Shield, and Composite?
100
Molten rock beneath the earth's surface.
What is Magma?
100
This is where most volcanoes occur.
Where is plate boundaries?
100
These are volanoes that erupt constantly.
What are active volcanoes?
200
Reservoirs from which volcanic materials erupt.
What are magma chambers?
200
This volcano erupts explosively and forms a cone-shaped hill.
What is Cinder Cone?
200
A feature formed at the top of a volcano's pipe when magma hardens. It looks like a giant tooth stuck in the ground!
What is a volcanic neck?
200
The zone where the rock above a colliding plate melts to form magma, which later erupts as lava.
What is the subduction zone?
200
These volcanoes have become inactive, but people are not certain that they will not erupt again.
What are dormant volcanoes?
300
The openings near the peak of a mountain through which volcanic materials erupt.
What are vents?
300
This type of volcano is made up of layers of lava rocks. It's not as steep as cinder cone volcano and is created slowly; that's why it has gentle and broad sides.
What is a shield volcano?
300
A region of volcanic activity in the middle of a tectonic plate.
What is a hot spot?
300
Magma rises for this reason.
What is because it is filled with gas and is less dense than the solid rock around it.
300
These eruptions have a high silica content.
What are explosive eruptions?
400
These are bowl-shaped depressions formed by forceful explosions that blow out tops of mountains.
What are craters?
400
This type of volcanic landform is made up of layers of lava flows alternating with layers of ash, cinders, and rocks. it is a combination of cinder cone and shield volcanoes.
What is a composite volcano?
400
A long curved chain of volcanic islands.
What is an island arc?
400
This happens to magma as it approaches the earth's surface.
What is it expands because it is under less pressure?
400
These are volcanoes that have not erupted in recorded history.
What are extinct volcanoes?
500
This is a fountain of water and steam that erupts from the ground.
What is a geyser?
500
This is magma that forces itself across rock layers and hardens.
What is a dike?
500
This is a zone of frequent earthquakes and volcanic eruptions that encircles the Pacific Basin.
What is the Ring of Fire?
500
This is how hot spots are formed.
What is they are formed when magma erupts through the crust and reaches the surface.
Hawaiian islands are created by hot spots.