Physical weathering The breaking down of rocks by mechanical processes into pieces that get smaller and smaller until they may eventually become sand, silt, or dust-sized particles (Planetary Geology for Teachers, 1999).
(pieces; get; smaller and smaller) (they; may become; sand, silt, or dust-sized particles; T:eventually)
pieces they
get may become
smaller and smaller
sand, silt, or dust-sized particles T:eventually