Yep
Mars
Yes, most of the surface is sand.
Mars and Earth.
winds
Mars and Earth.
I'd have to go with "wind."
Huge piles of sand are called sand dunes. Sand dunes typically form in deserts or coastal areas where there are strong winds that shape and move the sand into these large structures.
Barchan dunes are the crescent-shaped sand dunes commonly observed on Mars. They have a characteristic shape with a gentle slope facing the prevailing wind direction and a steeper slope facing away from the wind. Barchan dunes are formed by the movement of wind-blown sand.
There are only two sand dunes in Michigan. The two sand dunes are Sleeping Bear Dunes and Sliver lake sand dunes.
the largest sand dunes
sand dunes change
sand dunes i think?