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The ring of Fire is a long string of volcanoes located
around the edge of _____________________.
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The Pacific Ocean
The Atlantic Ocean
Africa
Australia
Where do most volcanoes occur?
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In the tropics
In the middle of tectonic plates
Along the edges of tectonic plates
Along earthquake faults
Which of these geologic formations would probably be
found along the boundary where two tectonic plates
meet?
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A plateau
A natural bridge
A volcano
An ocean
Where are most volcanoes located?
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In Africa
In the middle of tectonic plates
Along the edges of tectonic plates
In the middle of continents
Along the west coast of South America, one plate is diving beneath
another plate, creating volcanic mountains. This process is known
as_____________________
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Subduction
Faulting
Isostasy
sedimentation
New islands are continuously being formed in the Hawaiian Island chain
because___________________.
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A rift valley is opening up in the Pacific Ocean
The pacific plate is moving over a hot spot
The islands are moving over a plate boundary
The islands are sinking into the Earth’s crust
What are the two main gasses released by volcanoes?
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Hydrogen and helium
Argon and neon
Methane and propane
Water vapor and carbon dioxide
What property of liquid rock enables it to rise up
through cracks in the earth’s crust?
• Color: Liquid rock is lighter in color than solid
rock
• Texture: Liquid rock is smoother than solid
rock
• Density: Liquid rock is less dense than solid
rock
• Temperature: Liquid rock is hotter than solid
rock
Why would it be more likely that you would see lava as
opposed to magma?
• Lava is the term for magma after it has flowed
out of the ground
• Magma is much hotter than lava so you can
not see it as well.
• Magma can only be found and seen at the
bottom of the ocean.
• Magma is much darker in color than lava so it
is harder to see.
What do minor earthquakes in the vicinity of a volcano
indicate?
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There is a fault inside the volcano
The tectonic plates are moving
Magma inside the volcano is getting hotter
Magma inside the volcano is rising
What causes molten rock to explode out
of a volcano?
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Gravity
Earthquakes
Expanding gases
inertia
How is a volcano like a water faucet?
• Both a volcano and a water faucet can be
turned on and off at will
• Both a volcano and a water faucet work
because of a difference in temperature
• Both a volcano and a water faucet have
chambers directly below them
• Both a volcano and a water faucet are
locations where a fluid can flow out of an
otherwise closed system.
Magma inside the earth may start to rise because
it is ________________than the surrounding rock.
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Less dense
More dense
Cooler
More viscous
Why do most volcanoes form near the boundaries
of tectonic plates?
• There are week spots at the boundaries so
magma can erupt there
• Magma can rise up between the plates when the
plates move apart at these boundaries
• Magma is stronger near the boundaries of
tectonic plates so this where volcanoes often
form.
• There is an abundance of magma at the
boundaries of tectonic plates so eruptions often
occur here.