Volcano Study Guide
Know the definitions of the following terms:
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Silica
Lava
Vent
Extinct
Dormant
Active
Geyser
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Hot spring
Batholith
Dike
Basin
Caldera
Pipe
Volcanic neck
Understand the following concepts:
 Where can hot spots occur?
 The difference between an explosive and quiet eruption (how are magma
consistency and silica content related?)
 Approx. how long it took for California’s current landscape to develop.
 Why magma rises to the surface.
 What is created when magma hardens between rocks in a horizontal crack?
A vertical crack?
 What direction are the tectonic plates moving in California?
 Study Figure 3 on page 218. Understand the terms and movement
occurring on this diagram. (What type of boundary? Why is magma rising?)
 Study the 3 volcanic mountains on pp. 230-231. Understand how they are
formed, what type of eruptions produced them, and how they look.
** Review your Volcano Webquest AND Mount St. Helen’s article. There will be
one question from each of these on your quiz.