Which outcome is driven by density stratification during subduction?

💡 Explanation

Mantle wedge magma generation results from volatile release during subduction; the downgoing plate releases fluids, reducing the mantle's melting point. This is Slab-derived dehydration melting because the addition of water lowers solidus. Therefore the mantle melts rather than remaining solid.

• Which hazard increases following glacial cirque headwall over-steepening?
• Which outcome occurs when hydraulic action erodes steep sea stack faces?
• Which mechanism causes an increase in coastal mountain elevation as a continental plate overrides a subducting oceanic plate?
• Which risk increases as rising global temperatures accelerate permafrost thaw?
• Which process limits sediment deposition on an alluvial fan when increased rainfall changes drainage patterns?
• Which mechanism causes density-driven ocean circulation when surface water salinity increases substantially at high latitudes?