Which process exacerbates mantle wedge melting in subduction zones?

💡 Explanation

When a subducting slab descends, the progressive increase in pressure causes dehydration metamorphism because hydrous minerals release water into the mantle wedge, decreasing the wedge's melting point and promoting partial melting . Therefore dehydration is the main trigger, instead of conductive heat, pressure increase, or radiative heating which have minor localised effects.

• Which process limits fjord formation during periods of tectonic uplift?
• Which geographic effect amplifies incoming solar radiation at Earth's poles?
• Which ecological collapse risk increases where discontinuous permafrost thaws?
• Which feedback loop accelerates cirque erosion under increased warming?
• Which process reduces island size when prevailing currents encounter irregular coastlines?
• Which seismic consequence primarily occurs when the lower plate melts during subduction under the overriding plate?