Question

where do plates sink back into the mantle?
mid - ocean ridge
convective zones
slab pull
subduction zones

Explanation:

In plate - tectonics, subduction zones are the regions where one tectonic plate moves under another and sinks back into the mantle. Mid - ocean ridges are sites of seafloor spreading, convective zones are related to heat transfer in the mantle but not the specific location of plate sinking, and slab pull is a force related to subduction, not the location.

Answer:

D. subduction zones