Lava is magma that flows out onto Earth's surface.
100
What three kinds of landforms are created by the eruptions of volcanoes? Name all.
There are 3 types of volcanic landforms: Cindercone, Shield, and Composite
100
What is Magma?
Molten rock beneath the earth's surface.
100
Where do most volcanoes occur?
Most volcanoes, like most earthquakes, occur along the boundaries between shifting tectonic plates.
100
What are active volcanoes?
Active volcanoes are the volcanoes that erupt constantly.
200
How are volcanoes formed?
Hot magma beneath the earth's crust pushes up through cracks or holes.
200
What is a cinder cone volcano?
This type of volcanic landform is made up of small rock particles, or cinders. It is characterized by a small cone with steep sides.
200
Where does the word volcano come from?
The name for the Roman god of fire, Vulcan.
200
What is a summit?
The summit is the top of the mountain.
200
What are dormant volcanoes?
These volcanoes have become inactive, but people are not certain that they will not erupt again.
300
What is a vent? where is it located?
Openings through which volcanic materials erupt are called vents. They are located near the peak of the mountain.
300
What is a shield volcano?
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.
300
What is a hot spot?
A region of volcanic activity in the middle of a tectonic plate.
300
What type of volcano can blow its top?
Dome
300
What happened when Mount St. Helen Erupted in 1980?
Homes, roads, and forests were destroyed, and 60 people were killed.
400
What are craters?
Craters are bowl-shaped depressions. Forceful explosions may blow out the tops of mountains to form craters.
400
What is a composite volcano?
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.
400
A bowl shaped depression is a ________.
crater
400
What prevents magma from gradually and slowly rising to the peak of the mountain? (Think of soda)
The rocks above magma press down on the magma and create great pressure. When the pressure is released, volcanic materials suddenly erupt and move out to the surface.
400
What type of volcano is the most common in the world?
Composite Volcanoes
500
When a volcano no longer erupts it is said to be ______.
Extinct
500
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.
500
What is Ring of Fire and where is it located?
A zone of frequent earthquakes and volcanic eruptions that encircles the Pacific Ocean.
500
How have Volcanoes helped to create the Hawaiian Islands?
These are called "hot spots". Eruptions built up the islands, and new eruptions add lava to the shoreline.
500
How do 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