Ch 4 Volcanoes

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Ch 4 Volcanoes

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Who's class are you in and at what time? *

A _______ volcano has steep flanks, symmetrical cone shapes, distinct crater at the top, and a silica-rich magma that results in an explosive eruption style. *

1 point

1. flood basalt

2. caldera

3. stratovolcano (or composite volcano)

4. cinder cone

5. shield volcano

The largest type of volcano is called a _______ volcano and is characterized by broad, low-angle flanks, a small vent or groups of vents at the top, and basaltic magma. *

1 point

1. stratovolcano (composite cone)

2. shield volcano

3. cinder cone

4. caldera

5. lava dome

Explosive silica-rich volcanoes will be located mostly at ______. *

1 point

1. divergent boundaries of the mid-ocean ridge

2. convergent plate boundaries with subduction zones

3. convergent plate boundaries with continental to continental plate collisions

4. divergent boundaries of the East African Rift

Deep-sea hydrothermal vents (black smokers) are most commonly located at what plate boundary? *

1 point

1. divergent boundaries of the mid-ocean ridge

2. divergent boundaries of the East African Rift

3. convergent boundaries with subduction zones

4. convergent boundaries with oceanic to oceanic plate subduction

A __________ is a volcanic hazard arising from a collapsing eruption column that runs downhill at high speeds (>100 mph). These are associated with explosive eruptions and a mix of lava lapilli, pumice, ash, and hot gases. *

1 point

1. lapilli flow

2. rain composed of acid

3. pyroclastic flow

4. ash and lahar flow

Which of these relatively recent volcanic eruptions formed a caldera? *

1 point

1. Mt. Fuji

2. Paracutín

3. Mt. St. Helens

4. Yellowstone

5. Mauna Loa

What kind of volcanoes make up the Hawaiian Island Chain? *

1 point

1. shield volcanoes

2. lava domes

3. cinder cones

4. calderas

5. stratovolcanoes

Which volcanic hazard is LEAST likely to cause injury or death? *

1 point

Lahar

Ash fall

Pyroclastic flow

Lava flow

Landslide/mudflow

Occasionally, a volcano will spew large amounts of fine volcanic dust into the high atmosphere. This dust can have the effect of __. *

1 point

reducing the sunlight that reaches Earth's surface, suppressing photosynthetic processes

reducing Earth's surface temperature

damaging aircraft that fly through the dust

causing unusual weather

All of the answers are correct.

The last volcano to erupt in the continental 48 states was __. *

1 point

Mount Garibaldi

Mount Rainer

Mount Mazama

Mount St. Helens

Mount Fuji

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