Answer :

The samples could be distinguished by comparing their grain size and sorting

Sorting refers to the distribution of sediment grain size in sedimentary rocks or in unconsolidated deposits. Contrast this with crystallite size, which describes the size of a crystal as a whole within a solid. Crystallite is a grain's fundamental building block. The sediment sizes are mixed (have a significant variance) when the sediment is very badly sorted, whereas the sediment is well sorted when the sediment sizes are similar (low variance).

The technical meanings of the terminology used to characterise sorting in sediments—very poorly sorted, poorly sorted, moderately sorted, well sorted, and very well sorted—convey the degree of variation in particle sizes in a semi-quantitative manner.

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