1. How many prehistoric caldera-forming eruptions have happened at Yellowstone, how big were they, and what effects did the eruptions have on North America? 2. How do these prehistoric eruptions at Yellowstone compare to the largest known historic eruptions on Earth? (Be specific, and check page 5.) 3. Summarize the following features of Yellowstone and explain how they relate to the overall geologic setting. olava flows o earthquakes – hydrothermal explosions 4. What are main types of geologic hazards at Yellowstone? What have YVO (Yellowstone Volcano Observatory) scientists concluded about the relative risks of these different hazards?

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