This dark gray igneous rock is glassy and elsewhere
Chapter , Problem 113MCQ(choose chapter or problem)
Problem 113MCQ
This dark gray igneous rock is glassy and elsewhere contains small vesicles and flow bands. What kind of eruption probably formed this rock?
A. eruption of a low-viscosity, basaltic lava flow
B. eruption of high-viscosity lava in a dome
C. dome collapse that forms volcanic breccia
D. eruption of a pyroclastic flow that forms a thick and hot deposit
E. slow settling of ash from a tall eruption column forming a nonwelded tuff
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