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A large dune complex is called a dune field, [7] while broad, flat regions covered with wind-swept sand or dunes, with little or no vegetation, are called ergs or sand seas. [ 8 ] [ 9 ] [ 10 ] Dunes occur in different shapes and sizes, but most kinds of dunes are longer on the stoss (upflow) side, where the sand is pushed up the dune, and have ...
Issaouane Erg, Algeria Linear Dunes, Namib Sand Sea. An erg (also sand sea or dune sea, or sand sheet if it lacks dunes) is a broad, flat area of desert covered with wind-swept sand with little or no vegetative cover. [1] The word is derived from the Arabic word ʿirq (عرق), meaning "dune field". [2]
Dune system – Hill of loose sand built by aeolian processes or the flow of water; Estuary – Partially enclosed coastal body of brackish water; Firth – Scottish word used for various coastal inlets and straits; Fjard – Glacially formed, broad, shallow inlet; Fjord – Long, narrow inlet with steep sides or cliffs, created by glacial activity
A sandy depression formed when wind erodes into patches of bare sand on otherwise vegetation-stabilized sand dunes at the margins of coastal and arid ecosystems. bluff A steep slope or cliff marking the outer margin of a floodplain, especially one formed as the river erodes the concave bend of a meander. See also cut bank. bocage
A nabkha, nebkha or nebka is a type of sand dune. Other terms used include coppice dune and dune hummock or hummocky dune, but these more accurately refer to similar, but different, sand dune types. [1] Authors have also used the terms phytogenic hillock, [2] bush-mound, shrub-coppice dune, knob dune, dune tumulus, rebdou, nebbe, and takouit. [3]
A dune is a large pile of wind-blown material, typically sand or snow. As the pile accumulates, its larger surface area increases the rate of deposition in a positive feedback loop until the dune collapses under its own weight. This process causes dunes to move in the direction of the wind over time. [6] [7] Death Valley Mesquite Flats sand dunes.
Below, Esquire has rounded up the best Dune: Part Two memes so far. Below, you'll everything from red carpet jokes to sandworm shuffles—and, yes, the viral Duneussy . (Don't ask, OK?)
Where sand does occur, it is usually in large quantities in the form of sand sheets or extensive areas of dunes. [20] A sand sheet is a near-level, firm expanse of partially consolidated particles in a layer that varies from a few centimeters to a few meters thick. The structure of the sheet consists of thin horizontal layers of coarse silt and ...