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← GeographyWhich outcome occurs when viscous magma is extruded?
A)Formation of a lava dome✓
B)Rapid shield volcano growth
C)Widespread flood basalt eruption
D)Submarine hydrothermal vent formation
💡 Explanation
A lava flows viscosity drives dome formation; high viscosity prevents spreading, leading to an accumulation around the vent forming a dome. Therefore, a dome forms; rather than shield volcanoes or flood basalts which require lower viscosity lavas.
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