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Geography

Which 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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