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Ch 7.1 answers
Why does magma rise?
(p.294)
What kind of eruptions can
volcanoes cause?
(p.294)
It is less dense than
the surrounding rock
that it travels through.
Eruptions of liquid, gas,
or solid material
What happens at convergent
boundaries when there is an
oceanic plate involved? (p.296)
What type of eruptions tend to
occur at convergent boundaries?
(p. 296)
Subduction of an oceanic
plate
Violent eruptions
What types of eruptions occur at
divergent plate boundaries? (p.
297)
What is one of the most
noticeable signs of Earth’s interior
heat escaping? (p.297)
Fissure eruptions
Volcanic eruptions
Where do volcanoes typically
occur?(p.295)
Along divergent and
convergent plate
boundaries and hot spots
What is a volcanic arc and where
do they form?(p.296)
What is an island arc and where
do they form?(p 296)
A string of volcanoes
parallel to the edge of the
continent. / convergent:
oceanic to continental
A long, curved string of
volcanic islands.
/Convergent boundary:
oceanic to oceanic
What is a hot spot? Give an
example (p.298)
Label all of the parts.
What is a fissure eruption?
(p. 298)
It is when magma
escapes from narrow
elongated cracks in the
Earth’s crust
What is a vent? (p.297)
A central or ovalshaped opening of a
volcano
What is the belt of volcanoes in
the Pacific Ocean called?
(p.295)
The ring of Fire
Localized areas of high heat
in the Earth’s
interior/Hawaiian Islands
What is a volcano?
(p.294)
What is the difference between
Magma and Lava? (review)
A land or underwater
feature that forms when
magma reaches the
surface of the Earth
Magma is molten, liquid
rock material found
underground.
Lava is molten, liquid
rock material found on
the Earth’s surface
Ch 7.2 answers
What are the 2 things that
can lower the viscosity of lava
and make it flow more easily?
What is viscosity?
What is tephra?
Low amounts of silica
and high temperature
A physical property
that describes a
material’s resistance
to flow
Solid fragments of rock
or lava that drop from a
volcano during an
eruption.
What kind of eruptions do
Shield Volcanoes have?
What kind of eruptions do
composite volcanoes have?
Quiet eruptions
Both quiet and
explosive eruptions
What are the 2 types of magma/lava
and what type of eruptions do they
create?
What are the 2 types of
Basaltic Magma/lava and
what type of eruptions do
they create?
Draw a simple picture of
a shield volcano.
Draw a simple picture of
a Cinder cone volcano.
What makes the layers of a
composite volcano?
What is the viscosity of lava
that has a high percentage of
Silica?
What does it mean if a
volcanoes magma contains a lot
of dissolved gas?
Review: What kind of
materials do volcanic
eruptions contain?
It will have explosive
eruptions
Solids, liquids and
gases
Alternating layers of
lava and tephra
It has high viscosity
What kind of eruptions do
cinder cone volcanoes have?
Explosive volcanic
eruptions
1)BasalticMagma/Lava=
quiet eruptions
Pahoehoe=quiet
2)GraniticMagma/Lava= AA= quiet
explosive
What makes up the layers of
Draw a simple picture of a
a cinder cone volcano?
composite volcano.
Layers of Tephra.
Made from basaltic
lava