A. _Multiple Choice Questions 1. What is the term for the process by which magma rises to the surface due to a decrease in pressure? a) Decompression melting b) Magma differentiation c) Crustal thinning d) Volatile content increase 2. Which volcanic hazard is characterized by a fast-moving, hot cloud of ash, gas, and rock? a) Lahar b) Pyroclastic flow c) Volcanic ashfall d) Lava flow 3. What is the name of the theory that explains the formation of volcanic arcs? a) Plate Tectonics Theory b) Island Arc Theory c) Subduction Zone Theory d) Continental Drift Theory _B. 1. Describe the differences between phreatomagmatic and phreatic eruptions. 2. Describe the process of volcanic island formation through seafloor spreading. 3. Explain the role of volatiles in magma dynamics. C. True or False1. Volcanic ash can affect global climate patterns. 2. All volcanic eruptions produce lava flows. 3. The Pacific Ring of Fire is home to 75% of the world's active volcanoes.
Answer (1)
electromagnetic electric
