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Which outcome occurs when the descending slab stagnates during subduction?

A)Increased deep mantle seismic reflectivity
B)Enhanced asthenosphere convection cell formation
C)Accelerated overriding plate hydrothermal venting
D)Reduced arc volcanism silica concentration

💡 Explanation

Decreased negative buoyancy creates slab stagnation. This increases density contrasts within the mantle, leading to higher seismic impedance and greater reflectivity because of seismic impedance contrasts; therefore, reflectivity increases rather than convective changes or volcanic alteration.

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