Images of DunesPictures of dunes
The NASA is obliged to publish the pictures and to publish them on Flickr. Big, about north-south oriented transverse dunes fill the picture section.
PEARTH:...: GEOLOGY:: DESERT:: Examples for the picture of DUNES
Dunes: Collection of sandy materials carried by the winds and found in and along coastlines and dunes. Small, oblong dunes that are formed when the winds blow in two converging senses. The dunes that are formed vertically to the winds. The dunes facing in the same way, in the same orientation, running in the same wind. Half-moon seaside dunes whose branches point to the breeze; often the flora keeps them in place.
Radial dunes that form where gusts of air from different sides come together. Moved crescent-shaped dunes whose branches stretch in the same sense as the breeze.
Satelite images of dunes seen from outer space - Quartz
High performance satellite images and photographs from the International Space Station can provide a broad view of the whole globe as well as zooming in on detail of the Earth's surfaces. Viewed from afar, the complex formation of our planet's dunes becomes even more prominent. Keep up to date on quartz crystal product and event news.
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Sanddunes in the Tenere Desert, Niger
Described in this detailled photo are dunes in the Fachi-Bilma ergo (sea of sand) in the east part of the Tenéré Desert. Tenéré covers much of southeast Niger and is part of the wider Sahara desert that extends across North Africa. A large part of the Sahara consists of ergs; with an area of about 150,000 sq km, the Fachi-Bilma is one of the bigger sandy oceans.
There are two main kinds of dunes in the picture. Large, approximately north-south orientated cross dunes fill the picture section. Such dunes tend to develop at a right angle to the dominating northeast wind. In this picture, the dunes are characterized by thicker, more dark and steep sandy areas that throw shade.
Large dunes appear very symmetric in relation to their tops. It indicates that the comb deposits are rougher, which prevents the build-up of a more steep sliding surface on the side of the dunes remote from the winds due to the wind-driven movement of similarly large grain of gravel. Another group of thin dunes, approximately perpendicular to the dunes of the Cibe, seems to form on the bigger land forms and is therefore a more recent landmark.
The dunes seem to form from smaller granules in the same windfield as the bigger cibars. On December 1, 2009, the image of the cosmonaut ISS022-E-5258 was purchased with a Nikon D2Xs 400 mm objective camcorder and is provided by the ISS Crew Earth Observations Experiment and the Image Science & Analysis Laboratory, Johnson Space Center.
This picture was taken by the Expedition 22 team. Picture in this item has been trimmed and improved to enhance sharpness and sharpness. International Space Station Program is supporting the lab to help cosmonauts take images of the Earth that are of great value to science and the general community and make them available for free on the web.