Mechanical (physical) weathering: this involves several processes, all of which result in smaller pieces of material which are compositionally identical to the original.
(this; involves; several processes, all of which result in smaller pieces of material) (several processes; result; in smaller pieces of material) (smaller pieces of material; are compositionally; identical to the original)
this several processes smaller pieces of material
involves result are compositionally
several processes, all of which result in smaller pieces of material
in smaller pieces of material
identical to the original