This igneous rock contains flattened pieces of pumice and small crystals of quartz and feldspar. What type of eruption probably formed this rock?
A. eruption of a pyroclastic flow that forms a thick and hot deposit
B. eruption of a low-viscosity, basaltic lava flow
C. eruption of high-viscosity lava in a dome
D. slow settling of ash from a tall eruption column forming a nonwelded tuff
E. dome collapse that forms volcanic breccia
Answer: A
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