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Volcano Study Guide Magma Vent Lava Pyroclastic material Volcano Shield volcano Cinder cone volcano Composite volcano Crater Caldera Rift Hot spot Igneous rock Rock cycle Questions: 1. Describe the two types of volcanic eruptions. 2. How do water and silica affect volcanic eruptions? 3. What do we know about the composition of the magma under the oceanic and continental crusts? How do we know? 4. What happened at Lake Nyos? 5. What killed the people and animals at Lake Nyos? 6. What would happen at Lake Nyos if ammonia were dissolved in the water instead of carbon dioxide? 7. Find the molecular masses of H2O, CO2, O2, N3, NH3, CH4. 8. What is the difference between pyroclastic material and lava? What type of eruption causes each? 9. Describe the three types of volcanoes. 10. Where do most volcanoes occur? Explain. 11. Diagram the parts of the rock cycle. 12. How are volcanoes and rocks related? 13. Describe the three phases of the life of a volcano. 14. How is lava classified? 15. Describe the different types of lava. 16. How is pyroclastic material classified? 17. Describe the different types of pyroclastic material. 18. How does water and pressure affect the melting temperature of a rock?