“What is this bubbling out of the ground? It keeps bubbling, even if I dig a thin layer down with a shovel.”
Answer: “It turned out to be from a can of expansion foam the builders had left in the yard. Water got to the can, which rusted and leaked, causing the foam to reach the surface.”
I'm guessing the responder meant that after the raw rubber is extracted from rubber trees, it is formed into sheets. Then a batch of rubber sheets are stacked into a cube, presumably on a pallet, for transport to where they'll be used in manufacturing.
22 is for getting on a horse
or maybe for getting on a horse?
#21 ...and what a good blow --- job they give!