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A dune is a landform composed of wind- or water-driven sand. It typically takes the form of a mound, ridge, or hill. [1]
The Dune saga is set thousands of years in humanity's future.Faster-than-light travel has been developed, and humans have colonized a vast number of worlds. However, a great reaction against computers has resulted in a ban on any "thinking machine", with the creation or possession of such punishable by immediate death.
The Bene Gesserit are a key social, religious, and political force in Frank Herbert's science fiction Dune universe. The matriarchal group is described as a secretive and exclusive sisterhood whose members train their bodies and minds through years of physical and mental conditioning to obtain superhuman powers and abilities that can seem magical to outsiders.
Dunes: 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 ...
Erg Chebbi, Morocco Major dune seas of the Sahara in yellow, Great Sand Sea.Red dashed line shows approximate limit of the Sahara. Sand seas and dune fields generally occur in regions downwind of copious sources of dry, loose sand, such as dry riverbeds and deltas, floodplains, glacial outwash plains, dry lakes, and beaches.
Dune collisions [5] [6] and changes in wind direction spawn new barchans from the horns of the old ones and govern the size distribution of a given field. [7] As barchan dunes migrate, smaller dunes outpace larger dunes, catching-up the rear of the larger dune and eventually appear to punch through the large dune to appear on the other side.
Dunes may be part of a desert or part of a seashore. Subcategories. This category has the following 5 subcategories, out of 5 total. ...
Foredunes may begin as shadow dunes that form in the wind shadows of clumps of vegetation. [2] Several shadow dunes may eventually join to form an incipient foredune. [3] When an incipient foredune reaches a height of about 1.5 feet (0.5 m), it has a significant wind shadow of its own.