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← GeographyWhich outcome occurs when a lava effusion rate decreases significantly?
A)A steep-sided lava dome solidifies✓
B)Pahoehoe flows transition to Aa flows
C)Pyroclastic flows increase dramatically
D)Shield volcano lateral collapse occurs
💡 Explanation
A lava dome forms due to reduced lava flow. The viscosity rises, preventing distant flows because the lava cools rapidly; therefore, a concentrated mass accumulates. A dome rather than a flow results from this process.
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