Once magma reaches the surface, it is called.........
Lava
100
True or False: Magma rises to the surface because it is less dense than solid rock.
true
100
True or False: A volcano that erupts quietly produces ashes, cinders, and bombs.
False
100
True or False: A dike forms when magma hardens between rocks in a horizontal layer.
False.
100
True or False: A batholith forms when a large amount of lava hardens on the surface.
False
200
Where do hot spots occur?
Away from plate boundaries.
200
What are examples of chemical properties?
Able to burn, changes color, react with other substances.
200
Magma leaves a volcano through what part?
vent
200
What forms when magma hardens in the pipe of a volcano?
Volcanic neck
200
True or False: Hot water from underground can be used to heat homes.
True
300
What is the definition of a volcano?
A weak spot in the crust where magma comes to the surface.
300
Very hot magma produces lava called.....
pahoehoe
300
What is the silica content in magma if there is an explosive eruption?
high in silica.
300
What kind of mountain forms from a quiet eruption?
shield volcano
300
What forms when hot water and steam are trapped underground in a narrow crack?
geyser
400
What is the ring of fire?
A volcanic belt that formed by the many volcanoes that rim the Pacific Ocean.
400
How well a liquid flows depends on what?
viscosity
400
A volcano that is no longer erupting is called.....
extinct
400
A Huge whole left behind when a volcano collapses is a.....
caldera
400
A long tube that connects a magma chamber to the vent is called?
Pipe
500
Where can you find most volcanoes?
along plate boundaries
500
If the magma is high in silica, would it have high or low viscosity?
high
500
A volcano that is no longer erupting but still may in the future is said to be.....
dormant
500
Which kind of volcano is formed by a layer of lava, then ash cinder and bombs, then lava, than ash cinder and bombs? (quiet, explosive, quiet, explosive)
Composite volcanoes
500
What kind of plate boundary is show in the picture?
(divergent; convergent; transform)