What color is the sand in the Sahara?
It is mostly a golden yellow sand.
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ergs or areg
I asked a similar question of Dr. Christopher S. Swezey in 2001: Hi - I recently came across your letter to Science in the 10/8/99 issue and thought you might be able to …answer a question I have had since visiting the Sahara in 1985: how deep is the sand at its deepest? Or how deep at the greatest depth that has been sampled or imaged? Are your thermoluminscence data from drilling core samples? Thanks in advance for satisfying my idle curiosity. -- Gantt Galloway Here's the answer he gave me: Much of the Sahara is characterized by bare rock, and the sand in the Sahara tends to occur in discrete groups (usually topographic basins). Large areas covered by sand are called sand seas or "ergs." Within ergs, however, the amount of sand cover is variable. Dunes take on different shapes, as a function of wind characteristics and the amount of sand available. Barchan dunes (small crescentic dunes) form where the wind is unidirectional and where there is not much sand available. The interdune areas associated with barchan dunes consist of bare rock or some other non-sandy substrate. In contrast, star dunes form where the winds are multidirectional and where there is a lot of sand available. I am most familiar with the Grand Erg Oriental (Great Eastern Sand Sea) of Tunisia and Algeria. This erg is characterized by barchan dunes and other small linear dunes in the north, larger dunes with various linear and grid-like shapes further south, and star dunes at the extreme southeastern part of the erg. The tallest star dunes of this erg are 320 m high, and the interdune areas around the star dunes are filled with sand (Star dunes in most other regions of the Sahara are not as tall as the star dunes of the Grand Erg Oriental, so I assume that the sand cover is less thick in these other regions). I am not certain how thick the sand would be if you drilled a well in the middle of an interdune area among the Erg Oriental star dunes (maybe 150 m, maximum?). I do know that the dunes of the Erg Oriental rest on top of sandstones of Miocene age (~5-23 million years old), that these sandstones are exposed in the interdune areas to the north. Some oil companies have drilled wells in the southern part of the sand sea, but their targets are very deep and they rarely report the thicknesses of the younger sediments near the surface. My thermoluminescence dates from the Grand Erg Oriental were from small outcrops on the northern margin of the erg, where wind-blown sand deposits interfinger with lake and river deposits. I chose this area because it is a basin that lies below sea level, and is still subsiding. I thought that this might have the oldest record of wind-blown sediments in the Sahara. I found out, however, that most of these sediments are relatively young (
The sand fox is nocturnal so it operates during the cool portion of the day rather than traveling in the scorching sun. It has developed large ears to improve its ability to c…ool itself as canine animals don't sweat like we do. and it burrows underground to keep it cool when it is sleeping. They favour flat or undulating terrain where there is little vegetation, they avoid areas where there is not very much food, like bare sand dunes. They have quite a wide range of survivability in regards to temperature which ranges from anything from -5Â°C to 126Â°C however during extreme conditions they will normally retreat back to their burrows. Most of their water comes from their prey so they normally don't drink additional water as they can survive months merely from the water aquired from their food. However if water is available they will drink it. They have very large auditory bullae which will enhance the cats hearing to help it to pick up the vibrations in the sand, as well as this their ears are widely spaced and can be flattend horrizontally or pointed down to aid their hunting further. Small rodents are their primary prey, with records from Africa including including Spiny Mice (Acomys spp), Jirds ( Meriones spp), Gerbils ( Gerbillus spp), and Jerboas ( Jaculus spp. and Allactaga tetradactyla ), but also young of Cape Hare ( Lepus capensis ). They have also been observed to hunt small birds like Greater Hoopoe Lark ( Alaemon alaudipes ), Desert Lark ( Ammomanes deserti ), and consume reptiles such as Desert Monitor ( Varanus griseus ), Fringe-toed lizards ( Acanthodactylus spp.), Sandfish ( Scincus scincus ), Short-fingered Gecko ( Stenodactylus spp.), Horned and Sand vipers of the genus Cerastes , and insects (De Smet 1988, Abbadi 1993, Dragesco-JoffÃ© 1993, Sliwa in press). Sand-dwelling rodents made up the majority (65-88%) of stomach contents from carcasses collected in Turkmenistan and Uzebekistan in the 1960s (Schaenberg 1974). In Arabia the sand cat's distribution coincides with that of Sand Skinks and Arabian toad-head lizards; both reptiles are thought to be an important source of food for the cat   http://www.iucnredlist.org/details/8541/0
Varies between fine and extremely fine grains
there are 8 octillion grains of sand in Sahara and there are more rocks then sand in the Sahara.
yes there is
Yes. At the foot of the downwind side of a dune, the lightest and smallest particles accumulate. These can be quick sands on occasion.
In Sand Dunes
This cannot be answered, due to the constant moving of the sand dunes in the sahara.
Yes, most of the sand is made of weathered rock.