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← GeographyWhich process primarily shapes the formation of a lava dome?
A)High lava viscosity impedes outflow.✓
B)Rapid cooling causes crust solidification.
C)Increased gas content drives expansion.
D)Tectonic uplift raises extrusive material.
💡 Explanation
High lava viscosity promotes dome formation because internal pressure overcomes resistance, pushing the lava upwards via magmatic differentiation, therefore a rounded structure forms rather than a fluid flow, because low viscosity would allow wide spreading.
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