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.

• Following a glacial retreat, which mechanism leads to the formation of a proglacial lake dammed by a moraine?
• Which outcome results when arid playas experience deflation?
• Which process explains localized mantle upwelling leading to intraplate volcanism like Hawaii?
• Which risk increases where strike-slip faults intersect aquifers?
• Which geological consequence accelerates when permafrost thawing increases Arctic coastline sea cliff erosion?
• Which mechanism primarily maintains permafrost within a cirque's north-facing alcove at high latitudes?