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← GeographyWhich outcome happens as pyroclastic density currents cool atop porous terrain?
A)Fumarole formation and gas venting expands
B)Lithification generates ignimbrite deposits rapidly✓
C)Pumiceous clasts densify basalt-like rocks
D)Lahar formation erodes adjacent sediment deposits
💡 Explanation
Ignimbrite develops during pyroclastic flow deposition because cooling and the cementation causes welding of ash particles via sintering, therefore generating a welded tuff rock rather than the other outcomes under separate atmospheric or hydrological conditions.
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