Volcano_Jeopardy_ by shuifanglj

VIEWS: 9 PAGES: 55

									 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




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  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
   floor spreading, mountain
             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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 Menu                                   Jeopardy
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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 Menu                                          Jeopardy
You have 30 seconds to name as many plates as you can.
                  Spelling counts!
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