The force of gravity causing the slab to sink into the mantle .
(The force of gravity; causing; the slab to sink into the mantle) Context(The force of gravity causing,List([0, 28))):(the slab; to sink; into the mantle)
The force of gravity causing,List([0, 28))
The force of gravity the slab
causing to sink
the slab to sink into the mantle
into the mantle