A sand or gravel that is well graded (SW or GW) is which in terms of sorting?

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Study for the ASBOG Fundamentals of Geology exam. Access flashcards, multiple-choice questions, and understand key geologic principles. Prepare confidently for your exam!

Multiple Choice

A sand or gravel that is well graded (SW or GW) is which in terms of sorting?

Explanation:
Sorting is about how uniform the grain sizes are in a sediment. When a sand or gravel is described as well graded, it means there is a broad range of particle sizes present, filling many size classes rather than being all one size. That broad size distribution corresponds to poor sorting, because the grains are not uniform in size. In contrast, well sorted would mean a narrow size range, and uniformly graded implies most grains are near the same size. Therefore, a well graded sand or gravel is poorly sorted.

Sorting is about how uniform the grain sizes are in a sediment. When a sand or gravel is described as well graded, it means there is a broad range of particle sizes present, filling many size classes rather than being all one size. That broad size distribution corresponds to poor sorting, because the grains are not uniform in size. In contrast, well sorted would mean a narrow size range, and uniformly graded implies most grains are near the same size. Therefore, a well graded sand or gravel is poorly sorted.

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