Parts of a Volcano
It is the magma that flows out onto Earth's surface.
Lava
What three kinds of land forms are created by the eruptions of volcanoes? Name all.
There are 3 types of volcanic landforms: Cindercone, Shield, and Composite
Molten rock beneath the earth's surface.
Magma
Where do most volcanoes occur?
Most volcanoes are located at plate boundaries.
These are the volcanoes that erupt constantly.
Active volcanoes
These are reservoirs from which volcanic materials erupt.
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.
Cinder cone volcano
These are series of mountain that lie parallel to one another.
Mountain range
Why does the rock in the mantle melt?
Due to SUBDUCTION the rock in the mantle melts and becomes magma.
These volcanoes have become inactive, but people are not certain that they will not erupt again.
Dormant volcanoes
Openings through which volcanic materials erupt. They are located near the peak of the mountain.
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.
Shield volcano
A region of volcanic activity in the middle of a tectonic plate.
Hot spot
Why does magma rise?
magma, the melted mantle, rises because it is filled with gas and is less dense than the solid rock around it.
These are volcanoes that erupt at fairly frequent intervals.
Intermittent volcanoes
These are bowl-shaped depressions. Forceful explosions may blow out the tops of mountains to form them.
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.
Composite volcano
A long curved chain of volcanic islands.
volcanic island arc
What prevents magma from gradually and slowly rising to the peak of the mountain?
The pressure from the rock on top.
Volcanoes that have not erupted in recorded history
Extinct volcanoes.
It occurs when two plates collide. the denser; heavier, plate slides under the other plate and becomes part of the mantle.
Subduction
Which type of volcanic landform is the most destructive? Name a volcanic landform that was developed this way.
Composite volcano. Mt. St. Helens is a composite volcano.
A zone of frequent earthquakes and volcanic eruptions that encircles the Pacific Basin.
Ring of Fire
Name a landform created by hot spots.
Hot spots erupt and release magma. As magma comes out it becomes lava and hardens into landforms. Hawaiian islands are created by hot spots.
How does the types of volcanic eruptions differ?
Active: erupt constantly Intermittent: erupt at fairly frequent intervals Dormant: have become inactive but might erupt in future Extinct: have not erupted within recorded history