Which process increases mantle plume volcanism at divergent plate boundaries?

💡 Explanation

When lithospheric density decreases, buoyancy increases because hotter, less dense asthenosphere rises more readily, promoting melt generation via decompression melting and increased volcanism. Therefore decreased lithospheric density increases volcanism, rather than water content, sediment subduction, or rebound which inhibit melting.

• Which climatic effect results when thermohaline circulation weakens due to increased freshwater input in North Atlantic?
• Which atmospheric outcome occurs following extensive tephra deposition?
• Which process shapes isolated sea stacks during high wave surges?
• At what temperature does lava viscosity reduce to cause accelerated lateral lava flow rates?
• Which consequence results near the coast when excessive groundwater extraction destabilizes karst?
• Which outcome occurs when soluble bedrock undergoes focused infiltration?