Dunes on the surface of a planet indicates it has loose sand being blown by wind.
Mars
winds
I'd have to go with "wind."
It was open hard desert with sand dunes to the south.
Seif dunes and star dunes in Algeria
Mars and Earth.
There are only two sand dunes in Michigan. The two sand dunes are Sleeping Bear Dunes and Sliver lake sand dunes.
Fore dunes and back dunes but mostly fore dunes.
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.
Silver Lake Sand Dunes and Sleeping Bear Dunes
The size and shape of a sand dune can provide information on the prevailing wind direction, the amount of sand available for transportation, and the stability of the dune. For example, elongated dunes often form parallel to the direction of the prevailing wind, while symmetrical dunes indicate consistent wind patterns from multiple directions. Additionally, the steepness of the dune can indicate the dune's stability and likelihood of movement.
the largest sand dunes