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← GeographyWhich outcome occurs when degassing reduces viscosity of lava?
A)Extensive shield volcano formation occurs✓
B)Increased pyroclastic flow frequency results
C)Stratovolcano slope instability intensifies
D)Caldera collapse severity greatly increases
💡 Explanation
More extensive shield volcanoes form because reduced viscosity allows lava to flow further, promoting effusive eruptions via magma ascent, rather than explosive ones; therefore, A, rather than pyroclastic flows which are related to high viscosity magma.
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