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en.wikipedia.org/wiki/Dune

In physical geography, a dune is a hill of loose sand built by aeolian processes ( wind) or the flow of water. Dunes occur in different shapes and sizes, formed by interaction with the flow of air or water. Most kinds of dunes are longer on the windward side where the sand is .... Parabolic dunes have loose sand and steep slopes only on their outer flanks ...

en.wikipedia.org/wiki/Barchan

A barchan or barkhan dune is a crescent-shaped dune. The term was introduced in 1881 by Russian naturalist Alexander von Middendorf, for crescent-shaped sand dunes in Turkestan and other inland desert regions. ... in cross section, with a gentle slope facing toward the wind sand ridge, comprising well-sorted sand.

www.answers.com/Q/What_part_of_a_sand_dune_is_characterized_by_a_gentle_slope

The upwind direction of a sand dune has a gentle slope. A steep slope is on the downwind side. The pronounced slope of a sand dune is called a slip face.

www.answers.com/Q/Sand_dune_is_characterized_by_a_gentle_slope

A sand dune is a desert feature that forms as a result of wind orrain action towards one side. The sand dune usually forms towardsthe dominant side of the wind ...

www.answers.com/Q/This_part_of_a_sand_dune_is_characterized_by_a_pronounced_slope

The upwind direction of a sand dune has a gentle slope. A steep slope is on the downwind side. The pronounced slope of a sand dune is called a slip face.

www.actforlibraries.org/sand-dune-formation

Sand dunes are collections of grains of sand, forming hills, ridges or mounds, that ... They´re characterized by a gentle slope in the windward side of the dune ...

www.desertusa.com/geofacts/sanddune.html

Wind continues to move sand up to the top of the pile until the pile is so steep that ... In fact, most of the eastern part of the Kelso Dunes formed when water-filled ...

www.tulane.edu/~sanelson/eens1110/deserts.htm

Nov 17, 2015 ... They are characterized by specialized ecosystems and low human populations. ... The steep cliff forms on one side and a gentle slope parallel to the ... side. Dunes migrate by erosion of sand by wind (saltation) on the gentle ...

www.scienceclarified.com/landforms/Basins-to-Dunes/Dune-and-Other-Desert-Features.html

... between the gentle slope of the windward side (the side facing into the wind) and ... Sand dunes in the Gobi Desert, the coldest and northernmost desert in the  ...