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← GeographyWhich volcanic outcome occurs when felsic magma cools rapidly?
A)Pyroclastic flow generation increases greatly✓
B)Shield volcano formation preferentially occurs
C)Basaltic column formation readily expands
D)Lava viscosity reliably remains constant
💡 Explanation
Pyroclastic flows are generated by explosive eruptions; therefore, because rapid cooling increases magma viscosity and volatile content, a phreatomagmatic explosion becomes far more probably rather than a lava flow and reduced volcanic activity.
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