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geo directory

Some of these questions must be answered by consulting your textbook which correlates with the video series.  Consult: "Physical Geology -Earth Revealed" by Carlson, Plummer and McGeary; published by McGraw Hill, New York City, NY


 Episode 13. Volcanism
Volcanoes provide clues about what is going on inside Earth. Animations illustrate volcanic processes and how plate boundaries are related to volcanism. The program also surveys the various types of eruptions, craters, cones and vents, lava domes, magma, and volcanic rock. The 1980 eruption of Mount St. Helens serves as one example.

13. Volcanism

Why does magma rise to the surface?


Where are most of the world's active volcanoes?


What is pillow lava?


Describe the Hawaiian hotspot.


Describe basaltic (mafic) magma and why it commonly forms shield volcanoes.


What are rift zones?


Why are the volcanoes around the Pacific rim called composite volcanoes?

What is the "ring of fire"?


What common gasses occur in composite (intermediate) magmas?


What factors influence the explosiveness of volcanoes?

What does pyroclastic mean?

What is a nuee ardente?

Under what conditions can a lahar or mudslide be a major killer from a volcanic eruption?


Discuss andesitic (intermediate) magmas associated with composite volcanoes.


Describe pumice and how it is formed.


Discuss viscosity and how it relates to the formation of pahoehoe and aa lavas.


How do lava tubes form?


Describe cinder cones and how they differ from composite and shield volcanoes.


What tectonic settings are most volcanoes associated with?


What is obsidian and how is it formed?


Discuss the clues that volcanologists use to predict eruptions.


Discuss how volcanoes relate to ore deposits and geothermal energy.


What are some of the beneficial aspects of volcanoes?

link to answers  (this will not be an active link until after the assignment due date!)