From the experiment concluded that if it takes a little grinding on the sand by the book has the weight of the sand has a lot of roughness, which is in the range of sizes 300-425.
The experiment concluded that if it takes less time to grind sand by 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 spend little time on grinding sand by the library. To the weight of the sand with roughness). Which will be in range in size 300-425.