A broad, gently sloping, depositional surface formed at the base of a mountain range in a dry region by the coalescing of individual alluvial fans.
A crescent-shaped dune with the horns of the crescent pointing downwind.
A depression on the land surface caused by wind erosion.
A narrow pinnacle of resistant rock with a flat top and very steep sides.
The removal of clay, silt, and sand particles from the land surface by wind.
A region with low precipitation (usually defined as less than 25 cm per year).
A fracture in bedrock along which movement has taken place.
Flood of very high discharge and short duration; sudden and local in extent.
A fine-grained deposit of wind-blown dust.
longitudinal dune (seif)
Large, symmetrical ridge of sand parallel to the wind direction.
A broad, flat-topped hill bounded by cliffs and capped with a resistant rock layer.
A deeply curved dune in a region of abundant sand. The horns point upwind and are often anchored by vegetation.
A gently sloping erosional surface cut into the solid rock of a mountain range in a dry region; usually covered with a thin veneer of gravel.
Broad, flat-topped area elevated above the surrounding land and bounded, at least in part, by cliffs.
A very flat surface underlain by hard, mud-cracked clay.
A shallow temporary lake (following a rainstorm) on a flat valley floor in a dry region.
A region on the downwind side of mountains that has little or no rain because of the loss of moisture on the upwind side of the mountains.
A mound of loose sand grains heaped up by the wind.
The steep, downwind slope of a dune; formed from loose, cascading sand that generally keeps the slope at the angle of repose (about 34°).
A relatively straight, elongate dune oriented perpendicular to the wind.
Boulder, cobble, or pebble with flat surfaces caused by the abrasion of wind-blown sand.