Ripples in sand can be formed by wind or waves. The ripples I observed on the beach looked to be mostly formed by water, since they were being uncovered by the outgoing tide.

Washboard road is analogous to the little ripples that form on wind- or water-driven sand at the beach, and to the moguls which develop on ski hills. Motocross bikes and snowmobiles also make ripples.

If we go back to our beach and watch the waves as they roll in, we notice that the ripples from all the pebbles will occasionally add up to give an unusually high peak—a kind of mini ‘rogue ...

But beaches are also always changing. Every day, on the same walk, the sand looks different, renewed and refreshed. My favorite features are the ripples in the sand, because they have a story to tell.

The effects of a 7.6-magnitude earthquake in west Mexico were clear to be seen moments after it struck on September 19, with video by Francisco Barajas Lopez showing the cracked and crumpled ground at ...