Parts of a Volcano
magma that flows out onto Earth's surface.
What is lava?
what three kinds of landforms are created by the eruptions of volcanoes.
There are 3 types of volcanic landforms: Cindercone, Shield, and Composite
Molten rock beneath the earth's surface.
Magma
Where do most volcanoes occur?
occur along the boundaries between shifting tectonic plates.
volcanoes that erupt constantly.
Active volcanoes
streams of molten rock that pour or ooze from an erupting vent.
Lava
reservoirs from which volcanic materials erupt.
What are magma chambers?
This type of volcanic landform is made up of small rock particles, or cinders. It is characterized by a small cone with steep sides.
What is a cinder cone volcano?
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Vertical crack along horizontal layers
Dike
These volcanoes have become inactive, but people are not certain that they will not erupt again.
Dormant
Openings through which volcanic materials erupt. They are located near the peak of the mountain.
what is a vent?
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?
A region of volcanic activity in the middle of a tectonic plate.
What is a hot spot?
Why does magma rise?
rises because it is filled with gas and is less dense than the solid rock around it.
What is the collapsed volcano called
Caldera
ejected material such as rock fragments into the atmosphere.
Tephra
bowl-shaped depressions. Forceful explosions may blow out the tops of mountains to form these.
What are craters?
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?
A long curved chain of volcanic islands.
What is a volcanic island arc?
what prevents magma from gradually and slowly rising to the peak of the mountain?
Pressure
Volcanoes that have not erupted in recorded history are considered to be extinct volcanoes.
What are Extinct Volcanoes?
fluidized masses of rock fragments and gases that move rapidly in response to gravity.
Pyroclastic Flow
occurs when two plates collide. the denser; heavier, plate slides under the other plate and becomes part of the mantle.
subduction
A zone of frequent earthquakes and volcanic eruptions that encircles the Pacific Basin.
Ring of Fire
Name a landform created by hot spots.
Hawaiian islands are created by hot spots.
Large pockets of magma that reach deep into the crust
Batholith
an Indonesian term that describes a hot or cold mixture of water and rock fragments flowing down the slopes of a volcano and (or) river valleys.
Lahar