Stratovolcanoes: gray colored rocks, andesite, dacite, convergent boundary, Mt. Saint Helens, subduction, steep slopes, explosive eruptions, , Fissure Vents: dark rocks, basalt, divergent boundary, Laki, Iceland, vertical sides, , seafloor spreading, cracks in the Earth, fountains or curtains of fire, Shield: dark colored rock, gentle slopes, non explosive, basalt rock, Kilauea, hot spot island volcano, , Caldera: light colored rock, rhyolite rock, violent, explosive eruptions, hot spot continental volcano, super volcano, , Yellowstone,

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