The main source of downward convection flow in the mantle is called ridge-pull slab-pull slab-push ridge-push

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The main source of downward convection flow in the mantle is called ridge-pull slab-pull slab-push ridge-push

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It is the right choice; pull a slab

Slab pull is the main source of convection flow down the mantle.

Slab pull is the force applied to a dense oceanic plate that enters the mantle as a result of its own weight. This process is called subduction. The oceanic plate has a higher density than the warmer mantle below it and due to the difference in its density the plate is submerged into the mantle.