Volcano Jeopardy!

Volcano Jeopardy! 10 20 30 40 50 Volcano Tectonics Volcanic Activity Volcanic Lanforms Volcanic Activity Plate Tectonics 10 20 30 40 50

Why is Volcanic Activity considered a constructive force? Category 1 - 10

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

It flows (up/downward) into any cracks. Magma is a liquid- therefore it is (more/less) dense than surrounding solid material. It flows (up/downward) into any cracks. Category 1 - 20

Less dense and flows upward into cracks B C D Back to Menu

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

This dark-colored, volcanic rock is low in silica and forms both Iceland and the Hawaiian Islands.

Basalt Back to Menu

A large underground pocket of magma is called?

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

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 Back to Menu

He was an Admiral in the Roman Navy who attempted a rescue mission to Pompeii on August 24th, AD 79 as Mount Vesuvius erupted.

Pliny The Elder Back to Menu

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

The hotter the lava, (the more fluid it is.) More fluid means the lava has a lower viscosity. Hotter lava Back to Menu

The silica content helps determine whether the volcanic eruption is quiet or explosive. If the magma has a high viscosity 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 is thick and sticky the eruption is explosive and therefore the silica content must be high. Back to Menu

This mountain range includes Mount St This mountain range includes Mount St. Helens, Mount Rainier, and Mount Shasta just to name a few. The range forms as a result of subduction of The Juan de Fuca Plate under the North American Plate.

The Cascade Range Back to Menu Final Jeopardy

What are the three types of volcanoes?

Shield Cinder cone Composite Back to Menu

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) Back to Menu

What kind of a volcano is a tall, cone-shaped volcano which alternates eruptions of lava flows with explosive eruptions of ash, cinder and bombs. Name two examples:

Composite Volcanoes-examples are: Mount Fugi, Mount Vesuvius, and Mount St. Helens. Mount Fuji Mount Vesuvius Mount St. Helens Back to Menu

A Shield Volcano is wide at its base and 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 Back to Menu

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: sea floor spreading and quiet eruptions like those that formed Iceland. As the plates continue to diverge, Iceland will continue to get wider. Back to Menu Final Jeopardy

Most volcanoes are found along plate boundaries Most volcanoes are found along plate boundaries. 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 Back to Menu

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. A B C D

3. less 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. A B C D Back to Menu

Pyroclastic flows occur during the most dangerous kind of volcanic eruptions. Extremely hot gasses and fragments of rock travel down the sides of the volcano at speeds over 100 Km per hour killing and burying everything in their path. Pyroclastic flows are 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) Back to Menu

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, Italy in 79 A.D. Depiction of Mt Vesuvius 79 A.D. Excavated Pompeii today with Mt. Vesuvius Back to Menu

These are huge holes that form when a volcanic eruption empties a magma chamber and the volcanic mountain above it collapses into the magma chamber.

Calderas Back to Menu Final Jeopardy

What type of a volcano are the Hawaiian Islands? How did they form?

They are Shield Volcanoes 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. A hot spot is a location where a column of extremely hot mantle rock, called a mantle plume, rises through the asthenosphere. Back to Menu

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

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

Fissure eruptions occur when lava flows from giant cracks, or fissures, in the Earth’s crust. As a result, a thick and mostly flattened layer of cooled lava creates this landform.

A Lava Plateau is created. Back to Menu

What’s the difference between magma and lava?

Magma is the name given to liquid rock below the Earth’s surface while lava is the name given to liquid rock on the Earth’s surface. Back to Menu Final Jeopardy

You have 30 seconds to name as many plates as you can. 10 30 20

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