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Kumtag Desert
The Kumtag Desert (, "kum-tag" meaning "sand-mountain" in a number of Turkic languages), is an arid landform in Northwestern China, which was proclaimed as a national park in the year 2002. Definitions Broad The oval Tarim Basin with its central Taklamakan Desert is bounded on the north, west, and south by mountains. On the east side the Kumtag is an unbroken plain about 100 miles from north to south that runs from the Taklamakan to Gansu province and Mongolia. Many modern maps do not show a Kumtag in this sense, which implies that the usage may be out of date. The Kumtag Desert is a section of the Taklamakan Desert that lies east-southeast of the Desert of Lop. It is bordered by Dunhuang in the east, Tian Shan in the north and has an area of more than 22,800 square kilometers. Its southern rim is marked by a labyrinth of hills, dotted in groups and irregular clusters. Between these and the Altyn-Tagh is a broad latitudinal valley, seamed with watercourses that come down from the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kumtagh Desert
The Kumtag Desert (, "kum-tag" meaning "sand-mountain" in a number of Turkic languages), is an arid landform in Northwestern China, which was proclaimed as a national park in the year 2002. Definitions Broad The oval Tarim Basin with its central Taklamakan Desert is bounded on the north, west, and south by mountains. On the east side the Kumtag is an unbroken plain about 100 miles from north to south that runs from the Taklamakan to Gansu province and Mongolia. Many modern maps do not show a Kumtag in this sense, which implies that the usage may be out of date. The Kumtag Desert is a section of the Taklamakan Desert that lies east-southeast of the Desert of Lop. It is bordered by Dunhuang in the east, Tian Shan in the north and has an area of more than 22,800 square kilometers. Its southern rim is marked by a labyrinth of hills, dotted in groups and irregular clusters. Between these and the Altyn-Tagh is a broad latitudinal valley, seamed with watercourses that come down from the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jade Gate
Yumen Pass (; Uyghur: قاش قوۋۇق), or Jade Gate or Pass of the Jade Gate, is the name of a pass of the Great Wall located west of Dunhuang in today's Gansu Province of China. During the Han dynasty (202 BC – AD 220), this was a pass through which the Silk Road passed, and was the one road connecting Central Asia with East Asia (China), the former called the Western Regions. Just to the south was the Yangguan pass, which was also an important point on the Silk Road. These passes, along with other sites along the Silk Road, were inscribed in 2014 on the UNESCO World Heritage List as the Silk Roads: the Routes Network of Chang'an-Tianshan Corridor World Heritage Site. The pass is at an elevation of 1400 meters. Etymology Although the Chinese ''guan'' is usually translated simply as "pass", its more specific meaning is a "frontier pass" to distinguish it from an ordinary pass through the mountains. ''Yumen guan'' 玉門關 and ''Yang guan'' 陽關 are derived fr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Qilian Mountains
The Qilian Mountains (, also romanized as Tsilien; Mongghul: Chileb), together with the Altyn-Tagh (Altun Shan) also known as Nan Shan (, literally "Southern Mountains"), as it is to the south of Hexi Corridor, is a northern outlier of the Kunlun Mountains, forming the border between Qinghai and the Gansu provinces of northern China. Geography The range stretches from the south of Dunhuang some 800 km to the southeast, forming the northeastern escarpment of the Tibetan Plateau and the southwestern border of the Hexi Corridor. The eponymous Qilian Shan peak, situated some 60 km south of Jiuquan, at , rises to 5,547 m. It is the highest peak of the main range, but there are two higher peaks further south, Kangze'gyai at wit5,808 mand Qaidam Shan peak at wit5,759 m Other major peaks include Gangshiqia Peak in the east. The Nan-Shan range continues to the west as Yema Shan (5,250 m) and Altun Shan (Altyn Tagh) (5,798 m). To the east, it passes north of Qinghai Lake, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sand Dunes (1)
A dune is a landform composed of wind- or water-driven sand. It typically takes the form of a mound, ridge, or hill. An area with dunes is called a dune system or a dune complex. A large dune complex is called a dune field, while broad, flat regions covered with wind-swept sand or dunes with little or no vegetation are called ''ergs'' or ''sand seas''. Dunes occur in different shapes and sizes, but most kinds of dunes are longer on the stoss (upflow) side, where the sand is pushed up the dune, and have a shorter ''slip face'' in the lee side. The valley or trough between dunes is called a ''dune slack''. Dunes are most common in desert environments, where the lack of moisture hinders the growth of vegetation that would otherwise interfere with the development of dunes. However, sand deposits are not restricted to deserts, and dunes are also found along sea shores, along streams in semiarid climates, in areas of glacial outwash, and in other areas where poorly cemented san ... [...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 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, for example, aragonite, which has mostly been created, over the past 500million years, by various forms of life, like coral and shellfish. For example, it is the primary form of sand apparent in areas where reefs have dominated the ecosystem for millions of years like the Caribbean. Somewhat more rarely, sand may be composed of calciu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Steppe
In physical geography, a steppe () is an ecoregion characterized by grassland plains without trees apart from those near rivers and lakes. Steppe biomes may include: * the montane grasslands and shrublands biome * the temperate grasslands, savannas and shrublands biome A steppe may be semi-arid or covered with grass or with shrubs or with both, depending on the season and latitude. The term " steppe climate" denotes the climate encountered in regions too dry to support a forest but not dry enough to be a desert. Steppe soils are typically of the chernozem type. Steppes are usually characterized by a semi-arid or continental climate. Extremes can be recorded in the summer of up to and in winter, . Besides this major seasonal difference, fluctuations between day and night are also very great. In both the highlands of Mongolia and northern Nevada, can be reached during the day with sub-freezing readings at night. Mid-latitude steppes feature hot summers and cold wint ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Erosion
Erosion is the action of surface processes (such as water flow or wind) that removes soil, rock, or dissolved material from one location on the Earth's crust, and then transports it to another location where it is deposited. Erosion is distinct from weathering which involves no movement. Removal of rock or soil as clastic sediment is referred to as ''physical'' or ''mechanical'' erosion; this contrasts with ''chemical'' erosion, where soil or rock material is removed from an area by dissolution. Eroded sediment or solutes may be transported just a few millimetres, or for thousands of kilometres. Agents of erosion include rainfall; bedrock wear in rivers; coastal erosion by the sea and waves; glacial plucking, abrasion, and scour; areal flooding; wind abrasion; groundwater processes; and mass movement processes in steep landscapes like landslides and debris flows. The rates at which such processes act control how fast a surface is eroded. Typically, physical erosion procee ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sven Hedin
Sven Anders Hedin, KNO1kl RVO,Wennerholm, Eric (1978) ''Sven Hedin – En biografi'', Bonniers, Stockholm (19 February 1865 – 26 November 1952) was a Swedish geographer, topographer, explorer, photographer, travel writer and illustrator of his own works. During four expeditions to Central Asia, he made the Transhimalaya known in the West and located sources of the Brahmaputra, Indus and Sutlej Rivers. He also mapped lake Lop Nur, and the remains of cities, grave sites and the Great Wall of China in the deserts of the Tarim Basin. In his book '' Från pol till pol'' (''From Pole to Pole''), Hedin describes a journey through Asia and Europe between the late 1880s and the early 1900s. While traveling, Hedin visited Turkey, the Caucasus, Tehran, Iraq, lands of the Kyrgyz people and the Russian Far East, India, China and Japan. The posthumous publication of his ''Central Asia Atlas'' marked the conclusion of his life's work. Overview At 15 years of age, Hedin witnessed the tri ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Central Asia
Central Asia, also known as Middle Asia, is a subregion, region of Asia that stretches from the Caspian Sea in the west to western China and Mongolia in the east, and from Afghanistan and Iran in the south to Russia in the north. It includes the former Soviet Union, Soviet republics of the Soviet Union, republics of Kazakhstan, Kyrgyzstan, Tajikistan, Turkmenistan, and Uzbekistan, which are colloquially referred to as the "-stans" as the countries all have names ending with the Persian language, Persian suffix "-stan", meaning "land of". The current geographical location of Central Asia was formerly part of the historic region of Turkestan, Turkistan, also known as Turan. In the pre-Islamic and early Islamic eras ( and earlier) Central Asia was inhabited predominantly by Iranian peoples, populated by Eastern Iranian languages, Eastern Iranian-speaking Bactrians, Sogdians, Khwarezmian language, Chorasmians and the semi-nomadic Scythians and Dahae. After expansion by Turkic peop ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Grigory Potanin
Grigory Nikolayevich Potanin (alt. Grigorij Potanin) (russian: Григорий Николаевич Потанин; 4 October 1835 – 6 June 1920) was a Russian ethnographer and natural historian. He was an explorer of Inner Asia, and was the first to catalogue many of the area's native plants. On home soil, Potanin was an author and a political activist who aligned himself with the Siberian independence movement. Life Early life Potanin attended a Page Corps in Omsk, a military school for children from wealthy families. Potanin initially travelled to Siberia while serving with a Cossack division in Altaj in the 1850s. He returned to Saint Petersburg in 1858 to study Mathematical Physics. He was arrested for his participation in student demonstrations in 1861, and expelled from Saint Petersburg University. After spending three months in Petropavlovskaya fortress, he returned to Siberia. After leaving prison, he travelled to Siberia with Nikolai M. Yadrintsev, whe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Immigration Reduction
Opposition to immigration, also known as anti-immigration, has become a significant political ideology in many countries. In the modern sense, immigration refers to the entry of people from one state or territory into another state or territory in which they are not citizens. Illegal immigration occurs when people immigrate to a country without having official permission to do so. Opposition to immigration ranges from calls for various immigration reforms, to proposals to completely restrict immigration. Anti-immigration arguments National identity Whether and how national identity affects attitudes towards immigration depends heavily on the meanings associated with a particular national identity. If a national identity is defined in an exclusionary way that targets ethnic or racial groups, or if an ethnic or racial majority dominates in the political structures of a nation, then that national identity is likely to be associated with attitudes against immigration. Researc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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