. compare and contrast aa and pahoehoe lava in appearance and how they form.

2. In your own words, briefly explain four stages of caldera formation. Give examples of volcanos associated with calderas.

3. give approximate ages for the Dakota Sandstone and Wasatch Formation. Explain the evidence you used to determine the ages.

4. Volcanoes are generally not preserved in the geologic rock record because they are usually eroded away. However, the various materials erupted from volcanoes are often found preserved in the rock record. Identify three different types of volcanoes. From what you have learned about the different principle types of volcanoes that you mentioned above, how could you infer what type of volcano erupted in a given area based on the type of volcanic deposits now found as layers of rock? Give specific examples, and briefly discuss how some materials may be linked to different types of volcanoes.

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