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 topographic feature increases following post-glacial isostatic rebound near a cirque basin?
• Which outcome occurs when excessive irrigation precedes leaching?
• Which consequence results when a meandering stream encounters a resistant geological stratum?
• Which outcome occurs when differential stress exceeds the static friction across a fault plane at depth?
• Which mechanism causes the prevailing surface wind direction in temperate zones to be westerly rather than directly poleward?
• Which phenomenon causes the Coriolis effect on major ocean currents near continental coastlines?