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Rub' Al Khali
The Rub' al KhaliOther standardized transliterations include: /. The ' is the assimilated Arabic definite article, ', which can also be transliterated as '. (; , ) or Empty Quarter is a desert encompassing most of the southern third of the Arabian Peninsula. The desert covers some (the area of long. 44.5°−56.5°E, and lat. 16.5°−23.0°N), including parts of Saudi Arabia, Oman, the United Arab Emirates, and Yemen. It is part of the larger Arabian Desert. Description Terrain The desert is long, and wide. Its surface elevation varies from in the southwest to around sea level in the northeast. Most of the terrain is ergs, with sand dunes up to high, interspersed with gravel and gypsum plains. The sand is reddish-orange due to the presence of feldspar. There are also brackish salt flats in some areas, such as the Umm al Samim area on the desert's eastern edge. Ali Al-Naimi reports that the sand dunes do not drift. He goes on to say, Sand blows off the surface, of c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Liwa Oasis
The Liwa Oasis () is a large oasis area in the Western Region of the Emirate of Abu Dhabi, the United Arab Emirates. Geography Liwa Oasis is about south of the Persian Gulf coast and southwest of the city of Abu Dhabi, on the northern edge of Rub' al Khali desert. It is centered around and stretches about east-west, along an arch curved to the north. It consists of some 50 villages. The geographic and economic center of the oasis is Muzayri`, where the highway from Abu Dhabi enters the oasis and then divides to the east ( to the easternmost village, Mahdar Bin `Usayyan) and west ( to the westernmost village, `Aradah). According to the census of population of 2005, the population was 20,196. Earlier estimates judging from satellite images which gauged the population at 50,000 to 150,000, were too high. The villages of Liwa Oasis are the southernmost settlements of Abu Dhabi and of the United Arab Emirates. The southern border of Abu Dhabi with Saudi Arabia, which runs a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sand
Sand is a granular material composed of finely divided mineral particles. Sand has various compositions but is usually defined by its grain size. Sand grains are smaller than gravel and coarser than silt. Sand can also refer to a textural class of soil or soil type; i.e., a soil containing more than 85 percent sand-sized particles by mass. The composition of sand varies, depending on the local rock sources and conditions, but the most common constituent of sand in inland continental settings and non-tropical coastal settings is silica (silicon dioxide, or SiO2), usually in the form of quartz. Calcium carbonate is the second most common type of sand. One such example of this is aragonite, which has been created over the past 500million years by various forms of life, such as coral and shellfish. It is the primary form of sand apparent in areas where reefs have dominated the ecosystem for millions of years, as in the Caribbean. Somewhat more rarely, sand may be composed ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Water Buffalo
The water buffalo (''Bubalus bubalis''), also called domestic water buffalo, Asian water buffalo and Asiatic water buffalo, is a large bovid originating in the Indian subcontinent and Southeast Asia. Today, it is also kept in Italy, the Balkans, Australia, North America, South America and some African countries. Two extant Type (biology), types of water buffalo are recognized, based on Morphology (biology), morphological and Ethology, behavioural criteria: the river buffalo of the Indian subcontinent and further west to the Balkans, Egypt and Italy; and the swamp buffalo from Assam in the west through Southeast Asia to the Yangtze Valley of China in the east. The wild water buffalo (''Bubalus arnee'') is most probably the ancestor of the domestic water buffalo. Results of a phylogenetic study indicate that the river-type water buffalo probably originated in western India and was domesticated about 6,300 years ago, whereas the swamp-type originated independently from Mainland Sou ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hippopotamus
The hippopotamus (''Hippopotamus amphibius;'' ; : hippopotamuses), often shortened to hippo (: hippos), further qualified as the common hippopotamus, Nile hippopotamus and river hippopotamus, is a large semiaquatic mammal native to sub-Saharan Africa. It is one of only two extant species in the family Hippopotamidae, the other being the pygmy hippopotamus (''Choeropsis liberiensis'' or ''Hexaprotodon liberiensis''). Its name comes from the ancient Greek for "river horse" (). After elephants and rhinoceroses, the hippopotamus is the next largest land mammal. It is also the largest extant land artiodactyl. Despite their physical resemblance to pigs and other terrestrial even-toed ungulates, the closest living relatives of the hippopotamids are cetaceans (whales, dolphins, porpoises, etc.), from which they diverged about 55 million years ago. Hippos are recognisable for their barrel-shaped torsos, wide-opening mouths with large canine tusks, nearly hairless bodies, pillar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tuwaiq Escarpment
Jabal Tuwaiq (, Tuwaiq Mountain) is a narrow escarpment that cuts through the plateau of Najd in central Arabia, running approximately from the southern border of Al-Qasim in the north, to the northern edge of the Rub' al Khali desert near Wadi ad-Dawasir in the south. It is high and also has a Middle Jurassic stratigraphic section. The eastern side slopes downwards gradually, while the western side ends in an abrupt manner. The escarpment can be thought of as a narrow plateau, though the locals refer to it as a ''jebel'' ("mount"). Marshall Cavendish used the name "Tuwayr Mountains" to describe mountains of central Arabia, distinct from the Shammar in the north, the Dhofar in the south, and the Hajar to the east. Many narrow valleys (''wadis'') run along its sides, such as Wadi Hanifa, and a group of towns lie on its central section, including the Saudi capital, Riyadh. Many settlements have historically existed on either side of it as well, such as those of Sudair and Al ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mundafan
Mundafan was a former lake in Saudi Arabia, within presently desert-like areas. It formed during the Pleistocene and Holocene, when orbitally mediated changes in climate increased monsoon precipitation in the peninsula, allowing runoff to form a lake with a maximum area of . It was populated by fishes and surrounded by reeds and savanna, which supported human populations. Geography and lake Mundafan is a lies in the Najran Province of Saudi Arabia, southwest of the Rub' al Khali desert. The climate of the region is arid to hyperarid, with sand and stone deserts dominating the landscape. The name means "the buried sands". The perennial lake had an elongated shape in northwest-southeast direction and reached a maximum depth of and extent of during stages of high water levels, making it one of the largest former lakes of Arabia. It is possible that it was not one contiguous water body, but rather several separate lakes or an extended wetland. The lake was fed by wadis coming ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Monsoon
A monsoon () is traditionally a seasonal reversing wind accompanied by corresponding changes in precipitation but is now used to describe seasonal changes in Atmosphere of Earth, atmospheric circulation and precipitation associated with annual latitudinal oscillation of the Intertropical Convergence Zone (ITCZ) between its limits to the north and south of the equator. Usually, the term monsoon is used to refer to the Wet season, rainy phase of a seasonally changing pattern, although technically there is also a dry phase. The term is also sometimes used to describe locally heavy but short-term rains. The major monsoon systems of the world consist of the Monsoon#Africa (West African and Southeast African), West African, Asian–Australian monsoon, Australian, the North American monsoon, North American, and South American monsoons. The term was first Glossary of the British Raj, used in English in British India and neighboring countries to refer to the big seasonal winds blowin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Marl
Marl is an earthy material rich in carbonate minerals, Clay minerals, clays, and silt. When Lithification, hardened into rock, this becomes marlstone. It is formed in marine or freshwater environments, often through the activities of algae. Marl makes up the lower part of the White cliffs of Dover, cliffs of Dover, and the Channel Tunnel follows these marl layers between France and the United Kingdom. Marl is also a common sediment in post-glacial lakes, such as the marl ponds of the northeastern United States. Marl has been used as a soil conditioner and neutralizing agent for acid soil and in the manufacture of cement. Description Marl or marlstone is a carbonate mineral, carbonate-rich mud or mudstone which contains variable amounts of Clay minerals, clays and silt. The term was originally loosely applied to a variety of materials, most of which occur as loose, earthy deposits consisting chiefly of an intimate mixture of clay and calcium carbonate, formed under freshwa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Calcium Carbonate
Calcium carbonate is a chemical compound with the chemical formula . It is a common substance found in Rock (geology), rocks as the minerals calcite and aragonite, most notably in chalk and limestone, eggshells, gastropod shells, shellfish skeletons and pearls. Materials containing much calcium carbonate or resembling it are described as calcareous. Calcium carbonate is the active ingredient in agricultural lime and is produced when calcium ions in hard water react with carbonate ions to form limescale. It has medical use as a calcium supplement or as an antacid, but excessive consumption can be hazardous and cause hypercalcemia and digestive issues. Chemistry Calcium carbonate shares the typical properties of other carbonates. Notably, it: *reacts with acids, releasing carbonic acid which quickly disintegrates into carbon dioxide and water: : *releases carbon dioxide upon heating, called a thermal decomposition reaction, or calcination (to above 840 °C in the case of ), t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sabkha
A sabkha () is a predominately coastal, supratidal mudflat or sandflat in which evaporite-saline minerals accumulate as the result of a semiarid to arid climate. Sabkhas are gradational between land and intertidal zone within restricted coastal plains just above normal high-tide level. Within a sabkha, evaporite-saline mineral sediments typically accumulate below the surface of mudflats or sandflats. Evaporite-saline minerals, tidal-flood, and aeolian deposits characterize many sabkhas found along modern coastlines. The accepted type locality for a sabkha is at the southern coast of the Persian Gulf, in the United Arab Emirates.Neuendorf, K.K.E., J.P. Mehl, Jr., and J.A. Jackson, eds. (2005) ''Glossary of Geology'' (5th ed.). Alexandria, Virginia, American Geological Institute. 779 pp. Tucker, M.E. and Wright, V.P., 2009. ''Carbonate sedimentology.'' John Wiley & Sons. and Warren, J.K., 2006. Evaporites: sediments, resources and hydrocarbons. Springer Science & Business Media ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Umm Al Samim
The Umm al Samim () (also known as the Umm as Samim) is a quicksand area on the eastern edge of the Rub al'khali desert largely within Oman's borders. The waters, such as they are, drain into this brackish low-lying closed basin area off the Omani mountains and the wadis of the Rub al'khali. The Al Samim (known locally as the 'Mother of Poisons' or the 'Mother of Worries') is a salt marsh with a solid-looking crust, but can be very treacherous when broken through. There is little vegetation. Sir Wilfred Thesiger was the first European to see the area in the late 1940s after his travels from Salalah Salalah () is the capital and largest city of the southern Omani Governorates of Oman, governorate of Dhofar Governorate, Dhofar. It has a population close to 331,949. Salalah is the third-largest city in the Sultanate of Oman, and the largest ... in Oman. References Deserts of Oman Landforms of Oman Endorheic basins of Asia Salt marshes {{Oman-geo-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
