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← GeographyWhich outcome arises from increased magma viscosity in stratovolcanoes?
A)More explosive volcanic eruptions✓
B)Formation of shield volcanoes
C)Increase in effusive lava flows
D)Decrease in pyroclastic material
💡 Explanation
More viscous magma traps gases more effectively therefore increasing pressure, causing explosive eruptions due to gas expansion exceeding the rock's tensile strength, rather than effusive flows which are from less viscous magma.
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