Discussion Questions 

Answer Key for Discussion and Hyperstudio Questions


Lesson 7 "Lava Flows and Pyroclasts 


Thought and Discussion Questions 

  1. What caused the death of so many people during the second eruption of Vesuvius?
    Pyroclastic flows of 700 degree ash, gas, and pyroclasts moving of around 70 miles per hour swept over the city killing over 20,000 people. 
  2. What is a pyroclastic flow?
    A turbulent mixture of very hot gas, ash, and pyroclasts flowing down the side of a mountain at from 70 -200 miles per hour. 
  3. Describe pahoehoe and aa lava flows.
    Pahoehoe lava has a smooth and ropey texture. Pahoehoe forms when the lava flows at a slower speed, cooling slowly. Aa lava has a rough and fragmented surface. The lava forms when the lava flows at a fast speed, cooling quickly. 
  4. What is a pyroclast and how do they form? 
    Pyroclasts are 
  5. Write a definition for the following;
    1) High viscosity 2) Low viscosity

    Lesson 8 "Volcanic Cones and Eruptions" 

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  1. Name the six eruption types and the three cone shapes.


  2. Describe how a: 
    Shield cone forms
    Cinder cone forms
    Stratovolcano forms
  3. Draw diagrams to represent the six eruption types.


Lesson 9 "Hot Spots-Hawaii and Yellowstone" 

Discussion Questions 

  1. What is a Hot Spot? 
  2. How does and hot spot form?
  3. How does a caldera form?