Session 05B: Volcanoes HOMEWORK
Use Word to do your homework, convert to ONE .pdf and upload to Canvas. Scan required
illustrations and import to your Word document. Put your Name and Lecture Class number on each
homework submission
NAME: _ _ _ _ _ _ _ _ _ _ _ _ _ _ __
DATE: _ _ _ _ _ _ _ _ _ _ _ _ ___ __
YOUR ANSWERS ARE IN RED
A. Overview of the Chapter
1. Before reading the chapter, write down what you know about volcanism and volcano
processes.
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2. Write down 3 questions of your own that you want to know about volcanoes.
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3. Look through the chapters and find 5 figures or diagrams that capture your interest. Scan each
figure and insert the diagram in the table, belos
Figure
number in
textbook
Image of figure or diagram
Description of figure or
diagram
Then, and briefly describe (paraphrase) what each figure/diagram is showing in the row of boxes on
the right side of the table (above)
B. Chapter Vocabulary Words
It is extremely crucial that you understand the meaning of various vocabulary words to gain full
comprehension of the chapter’s content. Briefly define each vocabulary term, IN YOUR OWN WORDS,
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Magma
Lava
Viscosity
Aa flow
Pahoehoe flow
Lava tube
Pillow lava
Pyroclastic material
Tephra
Scoria
Fissure
Conduit
Vent
Cone
Crater
Caldera
Fumerole
Shield volcano
Cinder once
Composite volcano
Pyroclastic flow (nuee adant)
Lahar
Tsunami
Basalt plateau
Flood basalt
Lava dome
Volcanic neck (plug)
Volcanic pipe
Chapter Questions
1. List three factors that determine the nature of a volcanic eruption. What role does each play?
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2. What is viscosity? How does the chemistry (concentration of SiO2) influence magma’s viscosity? How
does temperature influence magma’s viscosity?
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3. Why is a volcano fed by highly viscous magma likely to be greater threat to life and property than a
volcano supplied with very fluid magma?
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Describe the characteristics of pahoehoe and aa lava flows. What main factor distinguishes the
difference in flow rates between each type of basaltic lava flow?
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4. List the main gasses released during a volcanic eruption.
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5. How do volcanic bombs differ from blocks of pyroclastic debris?
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6. What is scoria? How is scoria different from pumice?
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7. Compare and contrast the three main types of volcanoes (consider size, composition, shape and
eruptive style). Use the table, below to convey your answers.
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SIZE
COMPOSITION
SHAPE
ERUPTIVE
STYLE
CINDER CONE
COMPOSITE
VOLCANO
SHIELD
VOLCANO
8.
Name a prominent volcano and geographical location for each of the three main types.
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9.
Sketch a volcano (or find image on internet or in a book) and identify its morphologic parts: crater,
volcanic conduit, flanks, magma chamber, and caldera (assuming the volcano is dormant)
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10. Extensive pyroclastic flow deposits are associated with which volcanic materials?
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11. How to the eruptions that created the Columbia Plateau differ from eruptions that create large
composite cones?
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12. What is Shiprock, New Mexico, and how did it form?
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13. Draw a diagram (or find image on internet or in a book) of various intrusive bodies and label the
following: dike, sill, batholith, and laccolith structures
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14. Define geothermal gradient.
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15. Describe the three ways that solid rocks in the upper mantle and crust may melt to become magma.
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16. What is decompression melting and how does it occur. What is partial melting?
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17. How is magma generated along convergent plate boundaries?
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18. Volcanism at divergent plate boundaries is associated with which rock type?
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19. Volcanism at ocean to continent plate boundary is associated with what type of igneous rocks?
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20. Describe four natural hazards associated with volcanoes.
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21. What are the four changes that can happen in a volcanic area that is monitored for volcanic activity in
order to detect the migration of magma?
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22. What type of lava is illustrated in the image, below
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23. What type of magma is lava in the image, below
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24. What kind of eruption is shown, below
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