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Interacting with Journey
Through Geology CD-ROM
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Chapter 4:
Volcanism and Extrusive Rocks
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Expand your knowledge of
the concepts presented in this chapter by using the CD-ROM to answer the following
questions.
- Using both this book
and the CD-ROM that accompanies it, complete the following chart. The answers
can be found in the volcanoes module of the CD-ROM, in the Watch a Volcano
Grow activity, and on pages 87-96 of your book. To fill in the chart, answer
these questions for each kind of volcano:
- What is the viscosity
of the magma that builds this type of volcano?
- Of what composition
of magma is this kind of volcano usually composed (basalt, andesite, rhyolite)?
- What materials are
produced in the eruption of this type of volcano (lava flows, pyroclasts,
volcanic ash, pyroclastic flows)?
- Are eruptions usually
explosive or nonexplosive?
- How long does this
kind of volcano live (continue to have eruptions) and how frequent are eruptions?
| Volcano |
Magma
viscosity |
Magma
composition |
Products
of
eruption |
Explosivity |
Life &
frequency |
| Shield |
|
|
|
|
|
| Composite cone |
|
|
|
|
|
| Cinder cone |
|
|
|
|
|
| Lava dome |
|
|
|
|
|
| Flood basalt |
|
|
|
|
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- Try designing a volcano
(Volcanoes module, Design a Volcano activity)with these parameters: Low viscosity,
high volatility, any volume. What happens?Why do you think these conditions
virtually never occur in nature?
- Convergent Margins module,
Mt. St. Helens Erupts: What effects did the 1980 Mt. St. Helens eruption have?
How was this eruption related to the motion of tectonic plates?
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