Which outcome results when subduction of oceanic crust halts?

💡 Explanation

Subduction cessation reduces pathways for cold crust to fuel mantle plumes, hence decreasing mantle convection cell formation because subduction drives cold material down, therefore the whole system slows with fewer plumes, rather than increasing ocean ventilation which needs active downwelling.

• Which outcome occurs when increased glacial meltwater streams significantly freshen North Atlantic surface waters?
• Which geological hazard increases when groundwater extraction accelerates near a transform fault?
• Which phenomenon accelerates when permafrost thaws beneath an Arctic roadbed?
• Which process drives thermohaline circulation in deep glacial lakes during winter stratification?
• Which directional pattern is induced in trade winds by the Coriolis effect?
• Which atmospheric circulation pattern occurs when surface air converges in the intertropical convergence zone?