Subduction zones are downgoing convection cells in the earth but only carry oceanic material into the mantle.

Question

Quizplus · Accepted Answer

Subduction zones occur where two tectonic plates converge and one plate, usually the denser oceanic plate, is forced beneath the other plate and into the mantle. This process carries oceanic material, such as water and sediments, into the mantle. The other plate, usually the continental plate, is not subducted and remains at the surface. Therefore, only oceanic material is carried into the mantle at subduction zones.

Subduction Zones Are Downgoing Convection Cells in the Earth but Only