Volcano Jeopardy!

Volcano Jeopardy! VolcanoTectonics Volcanic Activity Volcanic Lanforms VolcanicActivity Plate Tectonics

Why is Volcanic Activity considered a constructive force ?

–Because volcanoes add new rock to existing land or form new islands. Back to Menu

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

Back to Menu Less dense and flows upward into cracks

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. Back to Menu

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. Back to Menu

A large underground pocket of magma is called?

A large underground pocket of magma is a magma chamber. Final Jeopardy Back to Menu

The force of an eruption depends on three things……

Back to Menu 1. The amount of gases dissolved in the magma. 2.The temperature of the magma 3.the silica content of the magma

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. Back to Menu

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

The hotter the lava, the more fluid it is.) Back to Menu Hotter lava

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. Back to Menu

Name the types of lava shown below.

1.Aa lava Final Jeopardy Back to Menu Pahoehoe lava

What are the three types of volcanoes?

Back to Menu a)Shield b)Cinder cone c)Composite

Describe a the shape of a Cinder Cone and what type of eruptions make it that way.

Back to Menu 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)

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:

Back to Menu Composite Volcano- examples are Mt. St Helens Mt. Fuji in Japan 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…

Back to Menu 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

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

Final Jeopardy Back to Menu A divergent boundary is associated with: 3.quiet volcanoes, sea floor spreading, mid ocean ridge

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. Back to Menu Examples: Japan, Aleutian islands, New Zealand

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. Back to Menu

A pyroclastic flow would be associated with what type of an eruption?

Back to Menu An explosive eruption. Pyroclastic flow occurs when an explosive eruption hurls out ash, cinders and bombs as well as gases. (400mph, 1,800˚F)

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. Back to Menu Excavated Pompeii today with Mt. VesuviusDepiction of Mt Vesuvius 79 A.D.

Describe the process of Sea-floor Spreading. Include where the magma rises and why this process is like a conveyor belt.

Mid-Ocean Ridge 1.Magma rises at the Mid-Ocean Ridge Basalt 2.Entering the ocean, magma cools into Basalt spreading 3.New magma rises and cools, spreading the rock out subducts 4.Old crust subducts under less dense crust and melts 5.The cycle repeats! Final Jeopardy Back to Menu

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. Back to Menu

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. Back to Menu

List the 3 types of boundaries symbolized by the following motions.

Convergent, Divergent, and Transform boundaries. Back to Menu

Locate & name the types of plate boundaries in the picture below. What is the missing boundary?

Back to Menu 1)Convergent: Oceanic/Oceanic crust Subduction zone 2)Divergent: Mid-Ocean Ridge 3)Transform Boundary (not shown)

Final Jeopardy Back to Menu

You have 30 seconds to name as many plates as you can. Spelling counts!

Back to Menu