Which effect significantly alters global deep ocean current flow pathways in the North Atlantic?

💡 Explanation

When North Atlantic waters become less dense due to warming or reduced salinity, the thermohaline circulation decelerates because the density gradient driving the sinking of cold, salty water weakens, disrupting the global conveyor belt. Therefore thermohaline circulation deceleration results, rather than wind-driven compensation, pressure intensification or upwelling which rely on disparate mechanisms.

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• Which risk increases when groundwater is extracted along an active normal fault?