Yes, most of the surface is sand.
Mars
Yep
Mars and Earth.
Mars and Earth.
winds
I'd have to go with "wind."
Large piles of sand are called dunes.
There are only two sand dunes in Michigan. The two sand dunes are Sleeping Bear Dunes and Sliver lake sand dunes.
ripples
the largest sand dunes
sand dunes change
sand dunes i think?