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← GeographyWhich risk increases when lava's viscosity prevents degassing?
A)Explosive volcanic eruptive events✓
B)Formation of pillow lava structures
C)Creation of shield volcano morphology
D)Deposition of extensive sedimentary layers
💡 Explanation
Explosive eruptions increase, because high viscosity traps gas, and increasing pressure overcomes magma strength via volatile enhancement. This releases massive pyroclastic flows rather than effusive flows characteristic of shield volcanoes; sediment deposition is unrelated.
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