The Explosive Earth - Volcanoes
In this Module, we will first study basic volcanic processes and the factors that determine a volcano's explosivity; this is helpful
in assessing how dangerous an individual volcano may be. We will also investigate different types of volcanic hazards
associated with specific volcano morphologies and learn how volcanologists predict volcanic eruptions. Finally, we will
incorporate our knowledge from the previous volcanism units into a plate tectonic framework to better understand how
volcanism is influenced by various plate interactions.
INSTRUCTIONS and QUIZ
Study and make notes based on the online course material and the textbook reading assignments, and read the commentaries
that follow. The review questions will allow you to assess your understanding of the key concepts.
This Module will be covered in the Volcanoes Quiz. Consult the FAQs for information on taking the Quizzes.
Use the following learning goals as a self-assessment tool to help you gauge your understanding of the course material
presented in this Module.
By the end of this Module, you will be able to:
1. Explain what magma density and magma viscosity are.
2. List the different categories of volcanic rocks and explain the differences between the magmas they came from.
3. Explain why some magmas erupt explosively (as pyroclastic material) and some magmas erupt effusively (as lava).
4. Explain the differences between pahoehoe and a'a lavas.
5. Describe the different types of volcanic eruptions and how they are related to magma properties.
6. Describe the morphology, dominant rock type and typical eruption style of the different types of volcanoes.
7. Explain what lava flows, fire fountains, lava bombs, and volcanic ash are and how they form.
8. Describe the particular hazards associated with lava flows, fire fountaining, lava bombs, and ash fall.
9. Explain what pyroclastic flows, lahars, volcanic domes, sector collapses, lateral blasts, and toxic gases are and how they
10. Describe the particular hazards associated with pyroclastic flows, lahars, dome collapses, sector collapses, lateral blasts,
and toxic gases.
11. Explain how the size of a volcanic eruption is estimated.
12. List the different volcano monitoring techniques and the instruments that are used.
13. Explain what a volcanic hazard map is and why they are useful.
14. Use your knowledge of volcanic processes to map major hazards around different volcanoes.
15. Evaluate the hazards to Vancouver associated with an eruption from Mount Baker.
16. Describe the distribution of the world's active volcanoes.
17. List the three types of plate boundaries and the different types of volcanoes that occur at these plate boundaries.
18. Describe the type of volcanoes that occur at oceanic and continental hot spots.