Assertion: desert's sand dune | /r/HasAspect | slipfacesurface
Facets:
Source sentences:
text: Most sand dunes -- mounds and ridges of sand sculpted by wind and gravity -- have a windward or "backslope" surface and a leeward or "slipface" surface.
text: Most sand dunes -- mounds and ridges of sand sculpted by wind and gravity -- have a windward or "backslope" surface and a leeward or "slipface" surface.