This Igneous Rock Contains Flattened Pieces of Pumice and Small

question 149

Multiple Choice

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 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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