Williams-3pia16189annotated-br

This set of images compares the Link outcrop of rocks on Mars (left) with similar rocks seen on Earth (right). A typical Earth example of sedimentary conglomerate formed of gravel fragments in a stream is shown on the right. Rounded grains (of any size) occur by abrasion in sediment transport, by wind or water, when the grains bounce against each other. Gravel fragments are too large to be transported by wind. At this size, scientists know the rounding occurred in water transport in a stream. Image credit: NASA/JPL-Caltech/MSSS and PSI

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