Where does old seafloor sink back into the Earth to be recycled?

Old seafloor sinks back into the Earth at subduction zones, where one tectonic plate is forced beneath another. This process typically occurs at convergent plate boundaries, often at oceanic-continental or oceanic-oceanic convergences. As the seafloor descends into the mantle, it is subjected to high temperatures and pressures, leading to its recycling into the Earth's interior.