This story appears in the November 2012 issue of National Geographic magazine. I got my first lesson in the physics of sand dunes in 1998 on an expedition into the Sahara. In order to take aerial ...

We pitched tents, and in the morning stepped out into the huge awesome presence of the dunes. It wasn’t a tan sandscape like in summer — virtually no sand was exposed on the entire 25-square ...

framed by steep sand dunes. The rain also filled lakes that are normally dry, such as one in Iriqui National Park, Morocco’s largest national park. NASA satellite images from the region ...

A new study has uncovered the mystery of how mini sand dunes form on beaches and in deserts. A new study led by the University of Southampton and research institutes in France has uncovered the ...