From the trials conclude that if a short time in the book of sand, crushed by the weight of the sand has a lot of roughness, which is in the range of sizes 300-425.
The experiments revealed that if a short time in the sand by crushing the book. The weight of sand can be a rough lot. It is in a range of sizes 300-425.
It was concluded that if the short amount of time to grind sand by the library. To the weight of the sand with roughness). Which will be in range in size 300-425.