Lava is magma that flows out onto Earth's surface.
100
What are the three main types of volcanoes? Name all three.
Cindercone, Shield, and Composite
100
What are active volcanoes?
Active volcanoes are the volcanoes that erupt constantly.
200
What are magma chambers?
Magma chambers are reservoirs from which volcanic materials erupt.
200
What is a cinder cone volcan0?
Short-lived volcano formed by explosive eruptions
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.
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
What are Extinct Volcanoes?
Volcanoes that have not erupted in recorded history are considered to be extinct volcanoes.
500
Define Subduction Zone. Where is it located?
subduction occurs when two plates collide. the denser; heavier, plate slides under the other plate and becomes part of the mantle.
500
What composite volcano erupted in 1980?
Mt. St. Helens
500
How do the types of volcanic eruptions differ?
Active: erupt constantly
Dormant: have become inactive but might erupt in future
Extinct: have not erupted within recorded history