# Volcano_Jeopardy_ by shuifanglj

VIEWS: 9 PAGES: 55

• pg 1
```									 Volcano
Jeopardy!
Volcano Jeopardy!
Volcano    Volcanic   Volcanic   Volcanic     Plate
Tectonics   Activity   Lanforms   Activity   Tectonics

10          10         10         10         10
20          20         20         20         20

30          30         30         30         30

40          40         40         40         40

50          50         50         50         50
Why is Volcanic
Activity considered a
constructive force?
–Because volcanoes add new rock to
existing land or form new islands.

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Magma is a liquid-
therefore it is (more/less)
dense than surrounding
solid material.
It flows (up/downward)
into any cracks.
Less dense and flows upward into
cracks

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•What is the bowl-shaped area
that forms around the
volcano’s vent and the lava
collects?
•Lava collects in the crater, the
bowl-shaped area that forms
around the volcano’s vent.

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•What is the point on the surface where
magma and gas leave the volcano’s
pipe?
The point on the surface where
magma and gas leave the
volcano’s pipe is the vent.

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A large underground pocket of magma
is called?
A large underground pocket of
magma is a magma chamber.

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The force of an
eruption depends on
three things……
1. The amount of gases dissolved in the
magma.
2.The temperature of the magma
3.the silica content of the magma

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•The more silica- the
thicker/thinner the magma and
the lighter/darker the color of
the lava.
•The more silica- the thicker
the magma and the lighter
the color of the lava.

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The hotter the lava, the more/
less fluid it is.)
The hotter the lava, the more
fluid it is.)
Hotter lava

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The silica content helps
determine whether the volcanic
eruption is quiet or explosive. If
the magma flows easily the
eruption is quiet/explosive and
therefore the silica content
must be high/low.
The silica content helps determine
whether the volcanic eruption is
quiet or explosive. If the magma
flows easily the eruption is quiet and
therefore the silica content must be
low.
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Name the types of lava shown
below.
1. Aa lava   Pahoehoe lava

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What are the three types of
volcanoes?
a) Shield
b) Cinder cone
c) Composite

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Describe a the shape of a
Cinder Cone and what type
of eruptions make it that
way.
A steep, cone-shaped hill.
If lava is thick and stiff it may
produce ash, cinders and
bombs in explosive
volcanoes
Paricutin in Mexico (farmers field 400m high)

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•What kind of a volcano is a tall, cone-
shaped volcano with a wide base which
alternates eruptions of lava flows with
explosive eruptions of ash, cinder and
bombs.
Name two examples:
Composite Volcano-
examples are Mt. St Helens
Mt. Fuji in Japan

Back to    Mt Fuji
A Shield Volcano forms from
layers of thin/thick lava that is
high/low in silica and has gentle/
steep slopes. An example of a
Shield Volcano is…
A Shield Volcano forms from layers of
thin lava that is low in silica and has
gentle slopes. An example of a Shield
Volcano is…Hawaii or Iceland

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A divergent boundary is
associated with:
1.explosive volcanoes, sea
building
2.quiet volcanoes, island arc
volcanoes, shield volcanoes
3.quiet volcanoes, sea floor
spreading, mid ocean ridge
4.explosive volcanoes, island
arc volcanoes, hot spots
A divergent boundary is associated
with:
3.quiet volcanoes, sea floor
spreading, mid ocean ridge

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Are volcanic mountains and island arcs
associated with convergent boundaries,
divergent boundaries or hot spots? Why?
Give 2 examples
Volcanic mountains and Island Arcs occur
at converging plates because the
denser plate dives below the crust,
melts and magma rises to the surface
creating the volcano.
Examples: Japan,
Aleutian islands,
New Zealand

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Magma flows upward through cracks in
rock because it is
1. highly magnetic
2. highly fluid.
3. less dense than the surrounding
solid material.
4. more dense than the surrounding
solid material.
Magma flows upward through cracks in
rock because it is
1. highly magnetic
2. highly fluid.
3. less dense than the
surrounding solid material.
4. more dense than the surrounding
solid material.

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A pyroclastic flow would be
associated with what type of
an eruption?
An explosive eruption.
Pyroclastic flow occurs when
an explosive eruption hurls
out ash, cinders and bombs
as well as gases. (400mph,
1,800˚F)

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What happened in these
photos? Where is this?
These people were killed instantly in
the pyroclastic flow from the explosive
eruption of Mt. Vesuvius in Pompeii in
79 A.D.
Depiction of Mt Vesuvius 79 A.D.   Excavated Pompeii today with Mt. Vesuvius

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Describe the process of Sea-floor
Spreading. Include where the magma rises
and why this process is like a conveyor
belt.
1. Magma rises at the Mid-Ocean Ridge
2. Entering the ocean, magma cools into Basalt
3. New magma rises and cools, spreading the
rock out
4. Old crust subducts under less dense crust
and melts
5. The cycle repeats!

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What type of a volcano are the Hawaiian
Islands? How did they form?
They are Shield Volcanoes. Each Island
was formed as the tectonic plate moved
over the Hot Spot and the lava produced a
volcanic mountain large enough to emerge
through the surface of the ocean.

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If geologists detect many small earthquakes
in the area near a volcano, what can they
infer about the volcano?
1.It is a good source of geothermal
energy.
2.It is dormant.
3.It is probably about to erupt.
4.It is extinct.
If geologists detect many small earthquakes
in the area near a volcano, what can they
infer about the volcano?
1.It is a good source of geothermal
energy.
2.It is dormant.
3.It is probably about to erupt.
4.It is extinct.

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List the 3 types of
boundaries symbolized
by the following motions.
Convergent, Divergent, and
Transform boundaries.

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Locate & name the types of plate
boundaries in the picture below.
What is the missing boundary?
1) Convergent: Oceanic/Oceanic
crust Subduction zone
2) Divergent: Mid-Ocean Ridge
3) Transform Boundary (not shown)

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The Purple line on the map represents
the                   . What type of
features do you think exist along the
and what causes them?
The               marks the
location of volcanic island arcs
as a result of Subduction at deep-
sea trenches.

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