Download Volcano Test Review

Name: ________________
Volcano Test Review
1. Why do Volcanoes erupt? Describe what happens when a volcano erupts?
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2. What geographical areas are volcanoes found? (3 main areas)
a. Subduction Zones “Ring of Fire” Areas where convergent boundaries happen
b. Spreading Boundaries, or Divergent Plates
c. Hot Spots
3. What tectonic activity is happening at each of these areas?
4. Name the volcanic landforms created at each geographical area.
Can you give two examples of each, look in the Locations of Volcanoes Power
Point.
Convergent Boundaries: oceanic-oceanic form Island Arcs, Japan, Aleutians
Oceanic – continental – form volcanic mountains, Mt.
St. Helens, Mt. Shasta, Mt. Hood.
Spreading Boundaries: Mid-Ocean Ridges, Rift Valley
Hot Spots: Island Chains, Hawaiian Islands
5. What is “Viscosity” as it applies to magma and lava?
6. Explain the factors that influence the viscosity of magma and lava.
a. Composition. – Example: Silica Content. How does this affect the
viscosity of magma/lava:
b. Temperature. – How does temperature affect the viscosity of
magma/lava?
c. Dissolved gases – How do dissolved gases affect magma?
7. Describe the three major volcanic landforms:
a. Shield VolcanoesSilica Type: _________________________
Temperature of Magma: __________________________
Amount of dissolved gases: ________________________
Eruption type(s): __________________________________
How this volcano type forms: _________________________
Shape, Height, appearance of volcano: __________________
Example: Kilauea, Mauna Loa
b. Composite VolcanoesSilica Type: _________________________
Temperature of Magma: __________________________
Amount of dissolved gases: ________________________
Eruption type(s): __________________________________
How this volcano type forms: _________________________
Shape, Height, appearance of volcano: __________________
Examples: Mr. Fuji, Mt. St. Helens, Mt. Shasta
c. Cinder Cone VolcanoesSilica Type: _________________________
Temperature of Magma: __________________________
Amount of dissolved gases: ________________________
Eruption type(s): __________________________________
How this volcano type forms: _________________________
Shape, Height, appearance of volcano: __________________
Examples: Paricutin, Sunset Crater
8. Describe the Activity Levels of Volcanoes:
Active: _____________________________________________
Dormant: ____________________________________________
Extinct: ______________________________________________
9. How are volcanoes destructive? ___________________________
What are the hazards associated with each type of volcano?
a. Shield Hazards:
b. Composite Hazards:
c. Cinder Cone Hazards:
10. What are the Constructive Affects of Volcanoes?
1. _____________________________________________
2. _____________________________________________
3. _____________________________________________
4. Natural Resources, ie: minerals, rock products
11. Explain what the Volcanic Explosivity Index, What does it measure?
Describe the scale and what factors it measures.
12. Why do earthquakes and volcanoes occur in the same areas?
13. Where are explosive and non-explosive volcanoes found. How does
plate tectonics influence whether a volcano is explosive or non-explosive?