The "'Valley of the Lakes "'( ) is an Barchan sand dunes are located on the valley's margins.
12.
On a seif dune the slipface develops on the side facing away from the strong wind, while the slipface of a barchan faces the direction of movement.
13.
For example, large parts of the Empty Quarter in Saudi Arabia and the southern UAE consist of patterns of high drifting barchan dunes alternating with sabkha salt flats.
14.
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.
15.
Olympia Undae contains a variety of dune forms and wind-related ( aeolian ) depositional features, including sand sheets, transverse dunes, simple barchan dunes, mega-barchans, and complex barchanoid ridges.
16.
Under the action of steady wind, free snow particles accumulate and drift like the sand grains in barchan dunes, and the resulting drifting snow shapes are also popularly referred to as " barchans ".
17.
He recognized two basic dune types, the crescentic dune, which he called " barchan, " and the linear dune, which he called longitudinal or " seif " ( Arabic for " sword " ).
18.
However, recent studies have shown that the mongoose's ability to resist snake venom is at least in part due to its modified nicotinic acetylcholine receptor ( AcChoR ) that does not bind with alpha-BTX, and alpha-neurotoxin ( Barchan et al . 1992)
19.
Simple barchan dunes may appear as larger, compound barchan or megabarchan dunes, which can gradually migrate with the wind as a result of erosion on the windward side and deposition on the leeward side, at a rate of migration ranging from about a metre to a hundred metres per year.
20.
Simple barchan dunes may appear as larger, compound barchan or megabarchan dunes, which can gradually migrate with the wind as a result of erosion on the windward side and deposition on the leeward side, at a rate of migration ranging from about a metre to a hundred metres per year.
