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this dark gray igneous rock is glassy and elsewhere contains small vesicles and flow bands. what kind of eruption probably formed this rock?eruption of a low-viscosity, basaltic lava flow eruption of high-viscosity lava in a dome dome collapse that forms volcanic breccia eruption of a pyroclastic flow that forms a thick and hot deposit slow settling of ash from a tall eruption column forming a nonwelded tuff