Answer:
Y, Z, X
Step-by-step explanation:
Weathering is the gradual decomposition of rocks by some of th agents of weathering such as the actions of wind and water.
Stage 1: Y block model the first stage of weathering when the rock is still a whole. It has not been affected by wind or water at this stage
Stage 2: Z block can be used to model this stage. The rock has started decomposing. It has decomposed from a whole rock into 8 small rocks.
Stage 3: X block model this stage. The rock has further decomposed from Z block to X block, that is, from 8 small rocks to 64 smaller rocks
In conclusion,
From 1 whole box to 8 small boxes to 64 smaller boxes