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← GeographyWhich outcome occurs when excessive volatiles depressurize magma?
A)Plinian eruption intensifying columnar jointing
B)Shield volcano forming basalt plains
C)Pyroclastic flows burying distant terrain✓
D)Fumarole emissions accelerate chemical erosion
💡 Explanation
Pyroclastic flows result because volatile depressurization causes explosive fragmentation during eruptions. Therefore, lateral flows dominate rather than vertical Plinian eruptions, altering the impact rather than forming expansive shield volcanoes.
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