Which outcome occurs when lithospheric thinning reduces magma viscosity?

💡 Explanation

Shield volcanoes increase because lithospheric thinning causes decreased pressure and therefore decreased magma viscosity; this increases effusive eruptions via decompression melting, rather than stratovolcano formation that requires high-viscosity magma.

• Which risk increases along strike-slip faults when subsurface pressure declines?
• Which downslope movement results when permafrost thaws and the active layer loses shear strength?
• Which feedback loop intensifies coastal upwelling when strong offshore winds blow parallel to the shoreline?
• Which process accelerates sea stack disintegration during winter storms?
• Which mechanism influences the orientation of cirques during glacial formation on a large mountain range?
• Which characteristic indicates the equilibrium line altitude lowering on a cirque glacier?