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← GeographyWhich risk increases when highly viscous magma generates pyroclastic flows?
A)Increased global albedo effect
B)Accelerated tectonic plate subduction
C)Regional atmospheric SO₂ loading✓
D)Decreased geothermal gradient locally
💡 Explanation
A silica-rich magma leading to pyroclastic flows increases regional sulfur dioxide concentration upon eruption via volatile exsolution, because SO₂ and other gases become trapped under viscous lava. Therefore, atmospheric loading increases, rather than affecting albedo because of the relatively short-lived nature of SO₂.
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