Question

which type of material becomes molten rock at subduction zones?
light plates
heavy plates
continental crust
new oceanic crust

Explanation:

At subduction zones, the denser (heavy) tectonic plate is forced beneath the less - dense plate. As the heavy plate descends into the mantle, the high temperatures and pressures cause it to melt and become molten rock (magma). Light plates are less likely to subduct deeply enough to melt. The continental crust is less dense and usually does not subduct to the depths where melting occurs in the same way as heavy plates. New oceanic crust is formed at mid - ocean ridges, not at subduction zones where melting of subducting material occurs.

Answer:

heavy plates