In G. theklae on the other hand, a single origin of desert-adapted plumage could not be excluded, as recurrent gene flow was detected among the two desertic populations investigated.
The transport of salts from land to sea (by erosion of rocks and surface runoff) and from sea to land (by evaporation, cloud formation, and precipitation), the age and origin of groundwater in desert regions, and the paleotemperature determinations based on isotope analyses of ice sheets and glaciers are a few examples.
The Precambrian Torridonian Arkose of Great Britain is thought to be of desert origin.
To a people of desert origins, it takes the partial place of icons and cathedrals, stage drama and political oratory.
Though, certain studies were conducted on the geological origin of these sand and deserts, results related to their physical, chemical, morphological, mineralogical, thermal, electrical and geotechnical characteristics are scanty.
Although the origin of the Sahara and Arabian deserts is still hotly debated [ 16- 19], it is generally accepted that climatic development in the late Miocene, as a result of major growth of the East Antarctic Ice Sheet and polar cooling, lead to an increase in aridification of mid-latitude continental regions [ 4] and that this had a profound effect on the diversification of faunas [ 20- 22].
The origins of the threat probably date back to a year ago, when rains drew in a wisp of desert locusts to Libya and Algeria, said Keith Cressman, the senior locust forecasting officer for the F.A.O.
Tagline: "170,000 square miles of desert.
I detect a whiff of desert wildflowers.
Theories of desert are various.
