1. Answer Analysis Questions 1-4 on IN76
2. Use your observations of the volcano model to answer the following: 

1. Describe the similarities and differences between the eruptions of volcanoes with less-gassy and more-gassy magma.
2. Which type of magma produced a more explosive 

1. Imagine a volcano erupting many times over a period of many years. Which of the following landforms is most likely a result of volcanic eruptions: flat plains, a hole or depression, or a mountain? Explain. 
2. What were the strengths and weaknesses of the volcano model? 

Hint: Think about ways in which the model did or did not represent real volcanoes or volcanic eruptions. 

1. In this activity, you modeled a system. A system is a group of interacting objects or processes. Every system includes 

• components: the substances, materials, and processes that make up the system.
• interactions: the relationships between the substances, materials, and processes in the system.
• boundaries: the extent of the system, separating those components and processes that are part of the system from those that arenot.

• a. In a volcano system, how does the geological process of a volcanic eruption result in the formation of igneous rock? 
• b. In a volcano system, how can different volcanic eruptions result in the formation of different kinds of igneous rock? 

Answer the Guiding Question: How can models help us understand what happens during a volcanic eruption? 

1. (IN74) Answer Analysis Questions 1-2 and the Guiding Question
2. 1. Look back at the facts about natural hazards caused by earthquakes and volcanoes from Student Sheet 4.1. Which of these natural hazards do you think presents the least challenge for the safe storage of nuclear waste underground? Explain your answer, making sure to use evidence to support your ideas. 
3.  
4. 2. Add the consideration “natural hazards caused by earthquakes and volcanoes” in a new row on Student Sheet 1.1, “Considering Where to Store Nuclear Waste.” In the second column, write the recommended action you would take in regard to this consideration. Explain why you recommend taking this action when deciding where to store nuclear waste. 

(IN72) Finish Analysis Questions 1-3 and answer Guiding Question

1. Think about what you learned from watching the video. How did using a model help scientists understand what happens during a landslide?
2. Why might it be important to consider landslide risk when deciding where to store nuclear waste? Use evidence from the activity to support your ideas.
3. Get out Student Sheet 1.1, “Considering Where to Store Nuclear Waste,” and fill out a new row with your recommended action regarding landslide risk.