Which process primarily drives the distribution of volcanic activity at subduction zones?

💡 Explanation

When a subducting plate descends, volatiles (water) are released during metamorphism, lowering the melting point of the overlying mantle wedge through flux melting, generating magma. Therefore volatile addition drives volcanism in subduction zones, rather than plume buoyancy, decompression melting or erosion which result from different geological factors.

• Which risk increases during the earthquake cycle phase known as the interseismic period at a subduction zone?
• Which phenomenon results from disruption of Hadley cell circulation patterns?
• Which geomorphic effect accelerates floodplain widening due to lateral erosion in alluvial rivers?
• Which mechanism inhibits stratovolcano formation at convergent plate boundaries with rapid subduction?
• Which downstream effect emerges when a stream's sinuosity hits its limit?
• Which mechanism causes shallow intra-plate earthquakes adjacent to transform boundaries?