Chapter 5: Volcanoes and Other Igneous Activity

Concept #1 Quiz

Choose the best possible answer to the following questions about Key Concept 1 "Factors that determine the nature of volcanic eruptions."


1. According to the Volcano World page on the violence of volcanic eruptions, what is the relation between the violence of an eruption and its frequency?  

2. Which statement is true about magma and volcanoes?  

3. In general, ___________ will be more likely to erupt explosively.  

4. Which of the following is the correct order of decreasing magma viscosity due to decreasing silica content?  

5. Comparing the different types of volcanoes (e.g., Hawaiian volcanoes and the Mt. St. Helens volcano), why does the difference in the composition of the magma that fed these volcanoes determine the type of volcano?  

6. The primary factor(s) that determine whether a volcano extrudes magma violently or "gently" is (are) the magma's __________.  

7. What are the most abundant gases emitted from basaltic volcanoes?  

8. _________ tend to increase the explosive potential of a magma body beneath a volcano.  

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