What is the difference between "Crushed Stone" and "Crushed Gravel …
"Stone" and "gravel" are descriptive of the size / particle distribution or even the source of a material, while "slag" is a type of material, irrespective of particle size or even shape. I think he intended to specify where the material would be sourced i.e. "rock" (from a quarry), "gravel" (from a gravel pit) and "slag" (waste product from ...
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