Which outcome occurs when increased water content alters mantle viscosity above subduction zones?

💡 Explanation

Increased mantle water content reduces viscosity, fostering magma ascentvia buoyancy. Therefore, explosive volcanic eruptions happen more frequently, because magma rises easier and traps more gases, rather than reduced hotspot activity, which relates to mantle plumes.

• Which consequence results when highly silicic magma erupts effusively?
• Which feedback mechanism enhances cirque formation at high altitudes?
• Which process amplifies rock fracturing during continental collision?
• Which risk notably increases when rapid, shallow groundwater extraction accelerates?
• Which erosion event results from high pore liquid pressure in sediments on steep volcanic slopes?
• Which mechanism slows stream discharge as permafrost thaws?