Rocks.<br>A bunch of waves went over the cliffs. The weathering started to take a toll. Some rocks began to fall. They made a splash in the waves. The rocks fell to the bottom of the ocean.
Rocks on the ocean bottom came from the cliff.
Some rocks may have came from the cliff, but some may have already been on the ocean floor.  So  there is no way to tell where every rock came from.
( z1 come :ARG1 ( z2 rock :location ( z3 bottom :mod ( z4 ocean ) ) ) :ARG3 ( z5 cliff ) )