Which outcome occurs when a subducting slab stagnates mid-mantle?

💡 Explanation

Reduced surface volcanic activity results because mantle upwelling due to slab-driven return flow weakens, a process known as mantle stagnation; therefore less magma reaches the surface, rather than increased volcanism which would occur under active subduction.

• Which phenomenon causes nutrient enrichment in surface waters during coastal upwelling?
• Which slope failure risk significantly increases when permafrost thaws initiating solifluction processes in arctic regions?
• Which influence diminishes effectiveness of single-cell thunderstorm formation near mountain ranges?
• Which mechanism causes meanders to form in mature river streams flowing across flat terrain?
• Which change occurs during subduction when hydrated oceanic crust descends into the mantle?
• Which risk increases when a warming climate thaws discontinuous permafrost beneath taiga forest?