He starts with descriptions of waves and ripples in blown sand, and passes later to the similar forms produced under water, giving many good photographs to illustrate their various characteristics.

Sand originates from the erosion of rocks in the mountains and is carried to the coast by streams. Once at the beach, wave energy—especially from waves approaching at an angle—drives the sand ...

"We found evidence for wind, waves, no shortage of sand — a proper, vacation-style beach." The research adds to a growing body of evidence that the Red Planet was once dominated by water ...