Name
Date
Class
Volcanoes and Plate Tectonics
If the statement is true, write true. If the statement is false, change the underlined word
or words to make the statement true.
1. _________________ Volcanoes form along the mid-ocean ridges, where two plates
move together.
2. _________________ Not all volcanoes form along plate boundaries.
3. _________________ Magma is molten material from the mantle that has reached
Earth’s surface.
4. _________________ Yellowstone National Park marks the location of a huge
island arc.
Fill in the blank to complete each statement.
5. An area where material from deep within Earth’s mantle rises to the crust and melts
to form magma is called a(n) _______________
6. _______________ is an underground molten mixture of rock-forming substances,
gases, and water from the mantle.
7. Volcanic belts form along the boundaries of Earth’s _______________
8. Japan and New Zealand are examples of strings of volcanic islands known as _______________
9. A volcano is a(n) _______________ that forms in Earth’s crust when molten
material reaches the surface.
10. The Ring of Fire is a major belt of _______________
Name
Date
Class
Volcanoes and Plate Tectonics
Understanding Main Ideas
Answer the following questions on a separate sheet of paper.
1. How do volcanoes change Earth’s surface?
2. Why do so many of Earth’s volcanoes occur along plate boundaries?
3. Explain how the hot spot shown in the diagram below created the Hawaiian Islands.
Draw an arrow on the diagram to show the motion of the plate and help explain the
process.
Building Vocabulary
Answer the following questions on a separate sheet of paper.
4. What is the difference between magma and lava?
5. Define each of these terms in your own words.
a. volcano
b. Ring of Fire
c. island arc
d. hot spot
Name
Date
Volcanic Eruptions
Understanding Main Ideas
Answer the following questions on a separate sheet of paper.
1. Why does magma in the mantle rise through the crust above it?
2. As magma rises toward the surface, what happens to the gases in it?
Why?
3. Contrast the silica content of magma in quiet and explosive
eruptions.
4. How does an explosive eruption produce pyroclastic flow?
5. Identify two hazards of a quiet volcanic eruption.
6. Describe the stages of volcanic activity.
Building Vocabulary
Label the figure below with the names of a volcano’s parts.
Class
Name
Date
Class
Volcanic Eruptions
Write the letter of the correct answer
on the line at the left.
1.
____ Which of the following is an
opening
through which molten rock and gas leave a
volcano?
2.
____ A volcano erupts quietly if its
magma is which of the following?
A cool
B solid
A pipe
C low in silica
B magma chamber
D high in silica
C crater
D vent
3. ____ What do geologists call a volcano
that is
not likely to erupt ever again?
A extinct
4.
____ From what kind of lava does
pahoehoe form?
A cool
B runny
C thick
D slow-moving
B dormant
C sleeping
D active
Fill in the blank to complete each statement.
5. A(n) _______________________________ is the spread of lava that pours out
of a volcano.
6. The elements oxygen and silicon form ____________________, a material found in
magma.
7. Geologists say a volcano is ____________________ if it is expected to awaken in the
future.
8. A mixture of hot gases, ash, cinders, and bombs that erupt explosively are called a(n)
____________________ flow.
9. Geologists classify volcanic eruptions as quiet or ____________________
10.
A(n) ____________________ is a pocket of magma beneath the surface.
Name
Date
Volcanic Landforms
Understanding Main Ideas
Answer the following questions on a separate sheet of paper.
1. Name each type of volcano shown in the diagrams. How is each
formed?
2. How does a lava plateau form?
3. What happens to create a caldera?
4. What are three features formed from magma?
5. How do landforms from magma form and become exposed?
Building Vocabulary
Write a definition for each of these terms on a separate sheet of paper.
6. batholith
7. dike
8. volcanic neck
9. sill
10. caldera
Class
Name
Date
Class
Volcanic Landforms
If the statement is true, write true. If the statement is false, change the underlined word
or words to make the statement true.
1. __________________ Repeated floods of molten material can form high, level
plateaus called magma plateaus.
2. __________________ When a volcano collapses, a hole called a(n) vent is left behind.
3. __________________ A(n) composite volcano is tall, cone-shaped, and made up of
alternating layers of lava and ash.
4. __________________ A(n) dike forms when magma cuts across rock layers and then
hardens.
5. __________________ Volcanic necks and dikes form when magma cools and hardens
into rock after reaching the surface.
6. __________________ A volcanic neck forms when magma hardens in a volcano’s pipe
and the surrounding rock later wears away.
Write the letter of the correct answer on the line at the left.
7. ____ Which is a wide, gently sloping
mountain formed by thin layers of lava
that pour out of a vent and harden on
top of previous layers?
A
cinder cone
B
composite volcano
C
shield volcano
D
dome mountain
9. ____ From which of the following does a
batholith form?
A
small body of magma
B
large body of magma
C
small body of lava
D
large body of lava
8. ____ Which forms from magma that
squeezes between horizontal rock layers
and later hardens?
A
batholith
B
sill
C
dike
D
caldera
10. ____ Which of these formed when a dome
mountain was exposed?
A
Columbia Plateau
B
black hills
C
Mauna loa
D
Mount St. Helens