Show:
Parts of a Volcano
Volcanic Landforms
Vocabulary
The Creation of Volcanoes
Eruptions
100
What is lava?
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 (Stratavolcano)

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
What are magma chambers?
Magma chambers are reservoirs from which volcanic materials erupt.
200
What is a cinder cone volcan?
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

What does the viscosity of lava tell us?

It tells us how the lava flows.

200

How are volcanoes created? ?

repeated eruptions of lava

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

When does rock begin to melt?

it begins to melt when temperature increases and pressure decreases

300

How does pyroclastic material form?

Magma explodes into the air and hardens

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. 

400
Which type of pyroclastic material gets its name from a word that means "little stones"?

lapilli

400
what prevents magma from gradually and slowly rising to the peak of the mountain?
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 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

Which type of volcanic landform is the most destructive?

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 do hot spots form new land? 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.
500

What would you expect to see during a nonexplosive eruption??

huge lava flows