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en.wikipedia.org/wiki/Dune

In physical geography, a dune is a hill of loose sand built by 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.coursehero.com/file/16685344/True-False-CH-13-14-15-9

True The Basin and Range province is characterized by rugged mountain ranges ... False Most sand dunes are asymmetric in cross section with a gentle slope ...

www.indiana.edu/~geol105/images/gaia_chapter_5/sedimentary_structures.htm

environment is characterized by a different sediment type. ... When cross-bedding forms, sand is transported as sand-dune like bodies (sandwave), in which sediment is moved up and eroded along a gentle upcurrent slope, and redeposited ... After several of these bedforms have migrated over an area, and if there is more ...

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 ...

onlinelibrary.wiley.com/doi/10.1046/j.1365-3091.2000.00290.x/abstract

The morphodynamics of fluvial sand dunes in the River Rhine, near Mainz, Germany. ... secondary dunes within the boundary layer on the stoss side of large dunes. ... the upper stoss slope of large dunes, diminishing in height but increasing in ... result in dunes characterized by gentle lee sides with weak flow separation.