Which of the following features represents the cold, downwelling part of the mantle convection system?

Question

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Subduction zones represent the cold, downwelling part of the mantle convection system. This is where dense oceanic plates sink into the mantle and are recycled back into the mantle. Mantle plumes and spreading centers represent the hot, upwelling part of the mantle convection system. Mantle plumes are hot columns of mantle material that rise up from the deep mantle to form hotspots and volcanic activity on the surface. Spreading centers represent the places where new oceanic crust is created as magma rises up from the mantle and solidifies, pushing apart the existing crust.

Which of the Following Features Represents the Cold, Downwelling Part