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| View Original: | Issaouane Erg, Algeria.jpg (540x334) | |||
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| Keywords: Issaouane Erg, Algeria.jpg en The Issaouane Erg sand sea is located in eastern Algeria between the Tinrhert Plateau to the north and the Fadnoun Plateau to the south Ergs are vast areas of moving sand with little to no vegetation cover Considered to be part of the Sahara Desert the Issaouane Erg covers an area of approximately 38 000 km2 These complex dunes form the active southwestern border of the sand sea The most common landforms in the image are star dunes and barchan or crescent dunes Small linear dunes appear at top left Star dunes are formed when sand is transported from variable wind directions whereas barchan dunes form in a single dominant wind regime The superimposition of two dune types suggests that wind regimes have changed through time The active nature of this portion of the Erg is well illustrated by this image �smaller dunes form and migrate along the flanks of the larger dunes and sand ridges Occasional precipitation fills basins formed by the dunes; as the water evaporates salt deposits are left behind which appear as bluish-white areas 2012-01-28 http //visibleearth nasa gov/view_rec php id 17085 Astronaut photograph was acquired January 16 2005 with a Kodak 760C digital camera with an 800 mm lens and is provided by the ISS Crew Earth Observations experiment and the Image Science Analysis Group Johnson Space Center The supports the laboratory to help astronauts take pictures of Earth that will be of the greatest value to scientists and the public and to make those images freely available on the Internet Additional images taken by astronauts and cosmonauts can be viewed at the NASA/JSC Custom license marker 2012 01 28 Uploaded with UploadWizard Satellite pictures of Algeria Touat Star dunes Barchan Erg Issaouane Depositional landforms in Algeria | ||||
