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← GeographyWhich volcanic outcome on converging plate boundaries increases with increased continental crust thickness?
A)Increased magma viscosity and explosivity✓
B)Basalt lava flow eruption frequency
C)Shield volcano formations probability
D)Reduced composite volcano cone height
💡 Explanation
Increased crust thickness results in an increased silica content, thus the partial melting mechanism increases magma's viscosity. Because crustal assimilation processes are prolonged, composite volcanoes have far more violent eruptions; therefore, increasing explosivity occurs rather than lava flows.
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