Volcanoes (Decker and Decker) - Chapters 11, 12, 13, and 16

1.  a) Explain the difference between a maar and a tuff ring?
     b) Go on-line and find an example of a maar in Oregon and a tuff ring in Oregon.  Tell me what
         examples you found.

2.  Define the following plutons, being sure to tell me how each differs from the other.
     a) sill
     b) dike
     c) laccolith
     d) lopolith
     e) batholith
     f) stock

3.  Chapter 13 describes two incidences where a volcanic gas has either killed people or almost killed
     people (and did kill trees).
     a) What volcanic gas is the killer?
     b) What are the two locations where this occurred?

4.  Explain in detail how a basaltic eruption of the Laki volcano could cause the deaths of 10,000 Icelanders.

Volcano Cowboys (Thompson) - pages 209-295

5. Describe the different official responses to the recent eruptions of Mt. Pinatubo and Nebado del Ruiz.  How did social and political factors affect the outcomes?

6.  Geologists studying volcanoes at the USGS in the late 1970s formed different groups.  In an earlier homework, you discussed the basis for the conflict between the HVO and Denver groups.  In the aftermath of Mt. Pinatubo, has this conflict been resolved?