This process causes the oceanic crust to return to the mantle were it is re-melted into magma .
(This process; causes; the oceanic crust to return to the mantle) Context(This process causes,List([0, 19))):(the oceanic crust; to return; to the mantle)
This process causes,List([0, 19))
This process the oceanic crust
causes to return
the oceanic crust to return to the mantle
to the mantle