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← GeographyWhich outcome occurs during a volcanic eruption where pyroclastic density currents encounter a body of water?
A)A secondary phreatomagmatic explosion ensues✓
B)Lava dome collapses accelerate downstream
C)Caldera formation risk diminishes slightly
D)Tephra cone erosion rates notably decrease
💡 Explanation
A phreatomagmatic explosion occurs because the intense heat of the pyroclastic flow rapidly vaporizes the water. This causes an immediate, forceful expansion known as steam explosion, therefore creating a secondary explosion rather than tephra erosion altering processes.
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