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← GeographyWhich caldera-forming outcome significantly increases due to ignimbrite deposition?
A)Groundwater hydrothermal system lifespan
B)Pyroclastic density current propagation✓
C)Magmatic differentiation slowdown rate
D)Andesitic lava viscosity reduction
💡 Explanation
Pyroclastic flow deposits such as ignimbrite elevate surface temperatures, which enhances thermal ground expansion; therefore, increased density current propagation results, rather than changed viscosity or differentiation, because high deposition temperatures lower the aerial friction coefficient.
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