1.
Afghanistan
–
Afghanistan, officially the Islamic Republic of Afghanistan, is a landlocked country located within South Asia and Central Asia. It has a population of approximately 32 million, making it the 42nd most populous country in the world. It is bordered by Pakistan in the south and east, Iran in the west, Turkmenistan, Uzbekistan, and Tajikistan in the north and its territory covers 652,000 km2, making it the 41st largest country in the world. The land also served as the source from which the Kushans, Hephthalites, Samanids, Saffarids, Ghaznavids, Ghorids, Khiljis, Mughals, Hotaks, Durranis, the political history of the modern state of Afghanistan began with the Hotak and Durrani dynasties in the 18th century. In the late 19th century, Afghanistan became a state in the Great Game between British India and the Russian Empire. Following the Third Anglo-Afghan War in 1919, King Amanullah unsuccessfully attempted to modernize the country and it remained peaceful during Zahir Shahs forty years of monarchy. A series of coups in the 1970s was followed by a series of wars that devastated much of Afghanistan. The name Afghānistān is believed to be as old as the ethnonym Afghan, the root name Afghan was used historically in reference to a member of the ethnic Pashtuns, and the suffix -stan means place of in Persian. Therefore, Afghanistan translates to land of the Afghans or, more specifically in a historical sense, however, the modern Constitution of Afghanistan states that he word Afghan shall apply to every citizen of Afghanistan. An important site of historical activities, many believe that Afghanistan compares to Egypt in terms of the historical value of its archaeological sites. The country sits at a unique nexus point where numerous civilizations have interacted and it has been home to various peoples through the ages, among them the ancient Iranian peoples who established the dominant role of Indo-Iranian languages in the region. At multiple points, the land has been incorporated within large regional empires, among them the Achaemenid Empire, the Macedonian Empire, the Indian Maurya Empire, and the Islamic Empire. Archaeological exploration done in the 20th century suggests that the area of Afghanistan has been closely connected by culture and trade with its neighbors to the east, west. Artifacts typical of the Paleolithic, Mesolithic, Neolithic, Bronze, urban civilization is believed to have begun as early as 3000 BCE, and the early city of Mundigak may have been a colony of the nearby Indus Valley Civilization. More recent findings established that the Indus Valley Civilisation stretched up towards modern-day Afghanistan, making the ancient civilisation today part of Pakistan, Afghanistan, in more detail, it extended from what today is northwest Pakistan to northwest India and northeast Afghanistan. An Indus Valley site has found on the Oxus River at Shortugai in northern Afghanistan. There are several smaller IVC colonies to be found in Afghanistan as well, after 2000 BCE, successive waves of semi-nomadic people from Central Asia began moving south into Afghanistan, among them were many Indo-European-speaking Indo-Iranians. These tribes later migrated further into South Asia, Western Asia, the region at the time was referred to as Ariana
2.
Tajiks
–
Tajik is a general designation for a wide range of Persian-speaking people of Iranian origin, with traditional homelands in present-day Tajikistan, Afghanistan and Uzbekistan. Alternative names for the Tajiks are Fārsī, Fārsīwān, and Dīhgān, not all Tajiks speak a variety of modern Persian. They may speak any one of the extant Iranian languages, for example, the Tajiks of China are actually Pamiris and speak the Eastern Iranic Pamiri languages and are distinct from more western Tajiks. The Bactrian and the Sogdian people are the ancestors of modern-day Tajiks. The ancestors of the Tajiks constituted the core of the ancient population of Khwārezm and Bactria, over the course of time, the eastern Iranian dialect that was used by the ancient Tajiks eventually gave way to Farsi, a western dialect spoken in Iran and Afghanistan. In later works, Frye expands on the complexity of the origins of the Tajiks. The geographical division between the eastern and western Iranians is often considered historically and currently to be the desert Dasht-e Kavir, according to Encyclopaedia Iranica, The most plausible and generally accepted origin of the word is Middle Persian tāzīk ‘Arab’, or an Iranian cognate word. Hence the Turks of Central Asia adopted a variant of the Iranian word, täžik, for example, the rulers of the south Indian Chalukya dynasty and Rashtrakuta dynasty also referred to the Arabs as Tajika in the 8th and 9th century. Iranians soon accepted it as an ethnonym, as is shown by a Persian court official’s referring to mā tāzikān “we Tajiks”, the distinction between Turk and Tajik became stereotyped to express the symbiosis and rivalry of the nomadic military executive and the urban civil bureaucracy. The 15th century Turkic-speaking poet Mīr Alī Šer Navāī also used Tajik as a reference to Persians, Tajiks are a substantial minority in Uzbekistan, as well as in overseas communities. Historically, the ancestors of the Tajiks lived in a territory in Central Asia than now. According to the World Factbook, Tajiks make up about 27% of the population in Afghanistan, although in the past, some non-Pashto speaking tribes were identified as Tajik, for example the Furmuli. Tajiks comprise around 79. 9% of the population of Tajikistan, in the 1926 and 1937 Soviet censuses, the Yaghnobis and Pamiri language speakers were counted as separate nationalities. After 1937, these groups were required to register as Tajiks, according to official statistics, Surxondaryo Province accounts for 24. 4% of all Tajiks in Uzbekistan, with another 34. 3% in Samarqand and Bukhara provinces. Official statistics in Uzbekistan state that the Tajik community comprises 5% of the total population. However, these numbers do not include ethnic Tajiks who, for a variety of reasons and it is only in the last population census that the nationality could be reported not according to the passport, but freely declared on the basis of the respondents ethnic self-identification. This had the effect of increasing the Tajik population in Uzbekistan from 3. 9% in 1979 to 4. 7% in 1989, expert estimates suggest that Tajiks may make up 35% of Uzbekistans population. According to the 1999 population census, there were 26,000 Tajiks in Kazakhstan, according to official statistics, there were about 47,500 Tajiks in Kyrgyzstan in 2007, up from 42,600 in the 1999 census and 33,500 in the 1989 census
3.
Pashtuns
–
The Pashtuns /ˈpʌʃˌtʊnz/ or /ˈpæʃˌtuːnz/, historically known by the exonyms Afghans, and Pathan, are an ethnic group native to Afghanistan and North-Western Pakistan. They are generally classified as Eastern Iranian ethno-linguistically, who use Pashto language and follow Pashtunwali, the origin of Pashtuns is unclear but historians have come across references to various ancient peoples called Pakthas between the 2nd and the 1st millennium BC, who may be their early ancestors. Their history is mostly spread amongst various countries of South and Central Asia, as the largest ethnic group in Afghanistan, Pashtuns have been the dominant ethno-linguistic group for over 300 years. The Barakzai dynasty played a role during the Great Game from the 19th century to the 20th century as they were caught between the imperialist designs of the British and Russian empires. There have been many notable Pashtun people throughout history, Ahmad Shah Durrani is regarded as the founder of the modern state of Afghanistan. Under Amanullah Khan, Afghanistan was able to pursue an independent foreign policy, some others include Malala Yousafzai, Shah Rukh Khan, Hamid Karzai, and Imran Khan. They are an important community in Pakistan, which has the largest Pashtun population, Pashtuns attained presidency there and high rankings in sports. They are the worlds largest segmentary lineage ethnic group, according to Ethnologue, the total population of the group is estimated to be around 50 million but an accurate count remains elusive due to the lack of an official census in Afghanistan since 1979. Estimates of the number of Pashtun tribes and clans range from about 350 to over 400, additional Pashtun communities are located in western and northern Afghanistan, the Gilgit–Baltistan and Kashmir regions and northwestern Punjab province of Pakistan. There are also sizeable Muslim communities in India, which are of largely Pashtun ancestry, throughout the Indian subcontinent, they are often referred to as Pathans. Smaller Pashtun communities are found in the countries of the Middle East, such as in the Khorasan Province of Iran, the Arabian Peninsula, Europe, important metropolitan centres of Pashtun culture include Peshawar, Quetta, Kandahar, Jalalabad, Kunduz, and Lashkar Gah. The cities of Kabul and Ghazni in Afghanistan are home to around 25% Pashtun population while Herat, with as high as 7 million by some estimates, the city of Karachi in Sindh, Pakistan has the largest concentration of urban Pashtuns in the world. In addition, Rawalpindi, Islamabad, and Lahore also have sizeable Pashtun populations, about 15% of Pakistans nearly 200 million population is Pashtun. In Afghanistan, they are the largest ethnic group and make up between 42-60% of the 32.5 million population. The exact figure remains uncertain in Afghanistan, which is affected by the 1.5 million or more Afghan refugees that remain in Pakistan. Another one million or more Afghans live in Iran, a cumulative population assessment suggests a total of around 49 million individuals all across the world. A prominent institution of the Pashtun people is the system of tribes. Despite this, many people identify themselves with various clans
4.
Uzbeks
–
The Uzbeks are a Turkic ethnic group, the largest Turkic ethnic group in Central Asia. They comprise the majority population of Uzbekistan but are found as a minority group in Afghanistan, Tajikistan, Kyrgyzstan, Kazakhstan, Turkmenistan, Russia. Uzbek diaspora communities also exist in Turkey, Saudi Arabia, the origin of the word Uzbek remains disputed. One view holds that it is named after Oghuz Khagan, also known as Oghuz Beg. Another states that the name means independent or the lord itself, from Oʻz, before, 5th century, what is todays Uzbekistan was part of Sogdia, mainly inhabited by Sogdians, an Indo-Iranian people. It was part of the Achaemenid Empire and later part of Sasanian Empire, from 5th to 6th century, what is todays Uzbekistan was part of the Hephthalite Empire. From 6th to 8th century, what is todays Uzbekistan was under the rule of Göktürk Khanate, Turkic and Chinese migration into central Asia occurred during the Chinese Tang Dynasty, and Chinese armies commanded by Turkic generals stationed in large parts of central Asia. But Chinese influence ended with the An Lushan rebellion, from the 9th century on, Transoxania was under the rule of Turkic Kara-Khanid Khanate, their arrival in Transoxania signalled a definitive shift from Iranian to Turkic predominance in Central Asia. Kara-Khanid ruler Sultan Satuq Bughra Khan was the first Turkic ruler to convert Islam, in the 12th century, Transoxania was conquered by Qara Khitai, a sinicized Khitan dynasty, they brought to Central Asia the Chinese system of government. In the 13th century, Kara-Khanid Khanate was destroyed by the Turkic Khwarazmian dynasty, the language-shift from Middle Iranian to Turkic and New Persian was predominantly the result of an elite dominance process. This process was boosted during the Mongol conquest when millions were either killed or pushed further south to the Pamir region. The modern Uzbek language is derived from the Chagatai language which gained prominence in the Timurid Empire. The modern Uzbek population represents varying degrees of diversity derived from the high traffic routes through Central Asia. Once populated by Iranian tribes and other Indo-European people, Central Asia experienced numerous invasions emanating out of Mongolia that would affect the region. According to recent genetic genealogy testing from a University of Oxford study, high levels of haplogroup 10 and its derivative, haplogroup 36, are found in most of the Altaic-speaking populations and are a good indicator of the genetic impact of these nomadic groups. The difference could be due to the density of the different geographical areas. Eastern regions of Central Asia must have had a low density at the time. Thus, the estimate from North-East Asia is high in the east
5.
Turkmens
–
The Turkmens are a Turkic people located primarily in Central Asia, in the state of Turkmenistan, as well as in Iran, Afghanistan, North Caucasus, and northern Pakistan. They speak the Turkmen language, which is classified as a part of the Eastern Oghuz branch of the Turkic languages, examples of other Oghuz languages are Turkish, Azerbaijani, Qashqai, Gagauz, Khorasani, and Salar. Originally, all Turkic tribes that were not part of the Turkic dynastic mythological system were designated Turkmens, only later did this word come to refer to a specific ethnonym. The etymology of the term derives from Türk plus the Sogdian affix of similarity -myn, -men, a prominent Turkic scholar, Mahmud Kashgari, also mentions the etymology Türk manand. The language and ethnicity of the Turkmen were much influenced by their migration to the west, Kashgari calls the Karluks Turkmen as well, but the first time the etymology Turkmen was used was by Makdisi in the second half of the 10th century AD. Like Kashgari, he wrote that the Karluks and Oghuz Turks were called Turkmen, some modern scholars have proposed that the element -man/-men acts as an intensifier, and have translated the word as pure Turk or most Turk-like of the Turks. During the Ottoman period these nomads were known by the names of Türkmen and these names were generally used to describe their nomadic way of life, rather than their ethnic origins. However, these terms were used interchangeably by foreigners. At the same time, various other exonym words were used for these nomads, such as Konar-göçer, Göçebe, Göçer-yörük, Göçerler, the most common one among these was Konar-göçer – nomadic Turcoman Turks. All of these words are found in Ottoman archival documents and carry only the meaning of nomad, Oghuz tribes had moved westward from the Altay mountains in the 7th century AD, through the Siberian steppes, and settled in this region. They also penetrated as far west as the Volga basin and the Balkans and these early Turkmens are believed to have mixed with native Sogdian peoples and lived as pastoral nomads until the Russian conquest of the 19th century. Signs of advanced settlements have been found throughout Turkmenistan including the Djeitun settlement where neolithic buildings have been excavated and dated to the 7th millennium BCE, by 2000 BCE, various Indo-European peoples began to settle throughout the region, as indicated by the finds at the Bactria-Margiana Archaeological Complex. Notable early tribes included the nomadic Dahae, Massagetae and Scythians, the Parni, a Dahae tribe came to dominate the region, and established the Parthian Empire, which also later fractured as a result of invasions from the north. Ephthalites, Huns, and Göktürks came in a parade of invasions. Finally, the Sassanid Empire based in Persia ruled the area prior to the coming of the Muslim Arabs during the Umayyad Caliphate by 716 CE, the majority of the inhabitants were converted to Islam as the region grew in prominence. Next came the Oghuz Turks, who imparted their language upon the local population, a tribe of the Oghuz, the Seljuks, established a Turko-Iranian culture that culminated in the Khwarezmid Empire by the 12th century. Mongol hordes led by Genghis Khan conquered the area between 1219 and 1221 and devastated many of the cities led to a rapid decline of the remaining Iranian urban population. The Turkmen largely survived the Mongol period due to their lifestyle and became traders along the Caspian
6.
Hazaras
–
The Hazaras are a Persian-speaking people who mainly live in central Afghanistan, Hazara Town in Balochistan, Pakistan, and Karachi. They are overwhelmingly Twelver Shia Muslims and make up the third largest ethnic group in Afghanistan, the dialect of Persian which they speak is called Hazaragi, which is more precisely a part of the Dari dialect continuum, and is mutually intelligible with Dari. Babur, founder of the Mughal Empire in the early 16th century and he referred to the populace of a region called Hazaristan, located west of the Kabulistan region, north of Ghazna and south-west of Ghor. The conventional theory is that the word Hazara derives from the Persian word for Thousand and it may be the translation of the Mongol word ming, a military unit of 1,000 soldiers at the time of Genghis Khan. With time, the term Hazar could have been substituted for the Mongol word, the origins of the Hazara have not been fully reconstructed. Thus, it is widely and popularly believed that Hazara have Mongolian ancestry, genetic analysis of the Hazara indicate partial Mongolian ancestry. Invading Mongols and Turco-Mongols mixed with the local Iranian population, forming a distinct group, for example, Nikudari Mongols settled in what is now Afghanistan and mixed with native populations who spoke Persian. The Hazara identity in Afghanistan is believed by many to have originated in the aftermath of the 1221 Siege of Bamyan, the first mention of Hazara are made by Babur in the early 16th century and later by the court historians of Shah Abbas of the Safavid dynasty. It is reported that they embraced Shia Islam between the end of the 16th and the beginning of the 17th century, during the Safavid period. Hazara men along with tribes of other groups had been recruited and added to the army of Ahmad Shah Durrani in the 18th century. Some claim that in the mid‑18th century Hazara were forced out of Helmand, during the second reign of Dost Mohammad Khans in the 19th century, Hazara from Hazarajat began to be taxed for the first time. However, for the most part they still managed to keep their autonomy until the subjugation of Abdur Rahman Khan began in the late 19th century. When the Treaty of Gandomak was signed and the Second Anglo-Afghan War ended in 1880, Abdur Rahman Khan set out a goal to bring Hazarajat and he launched several campaigns in Hazarajat due to resistance from the Hazara in which his forces committed atrocities. The southern part of Hazarajat was spared as they accepted his rule, while the parts of Hazarajat rejected Abdur Rahman and instead supported his uncle. In response to this Abdur Rahman waged a war against tribal leaders who rejected his policies, Abdur Rahman arrested Syed Jafar, chief of the Sheikh Ali Hazara tribe, and jailed him in Mazar-e-Sharif. The first Hazara uprising against Abdur Rahman Khan took place between 1888 and 1890, when Emir Abdur Rahmans cousin, Mohammad Eshaq, revolted against him, tribal leaders of the Sheikh Ali Hazaras joined the revolt. The revolt was short lived and crushed as the Emir extended his control over parts of Hazarajat. Leaders of the Sheikh Ali Hazaras had allies in two different groups, Shia and Sunni, Abdur Rahman took advantage of the situation, pitting Sunni Hazara against the Shia Hazara, and made pacts among the Hazara
7.
Turkmenistan
–
Turkmenistan has been at the crossroads of civilizations for centuries. In medieval times, Merv was one of the cities of the Islamic world and an important stop on the Silk Road. Annexed by the Russian Empire in 1881, Turkmenistan later figured prominently in the movement in Central Asia. In 1924, Turkmenistan became a constituent republic of the Soviet Union, Turkmen Soviet Socialist Republic, Turkmenistan possesses the worlds fourth largest reserves of natural gas resources. Most of the country is covered by the Karakum Desert, since 1993, citizens have received government-provided electricity, water and natural gas free of charge. Turkmenistan was ruled by President for Life Saparmurat Niyazov until his death in 2006, Gurbanguly Berdimuhamedow was elected president in 2007. According to Human Rights Watch, Turkmenistan remains one of the world’s most repressive countries, after suspending the death penalty, the use of capital punishment was formally abolished in the 2008 constitution. Historically inhabited by the Indo-Iranians, the history of Turkmenistan begins with its annexation by the Achaemenid Empire of Ancient Iran. In the 8th century AD, Turkic-speaking Oghuz tribes moved from Mongolia into present-day Central Asia, part of a powerful confederation of tribes, these Oghuz formed the ethnic basis of the modern Turkmen population. In the 10th century, the name Turkmen was first applied to Oghuz groups that accepted Islam, There they were under the dominion of the Seljuk Empire, which was composed of Oghuz groups living in present-day Iran and Turkmenistan. Turkmen soldiers in the service of the played a important role in the spreading of Turkic culture when they migrated westward into present-day Azerbaijan. In the 12th century, Turkmen and other tribes overthrew the Seljuk Empire, in the next century, the Mongols took over the more northern lands where the Turkmens had settled, scattering the Turkmens southward and contributing to the formation of new tribal groups. The sixteenth and eighteenth centuries saw a series of splits and confederations among the nomadic Turkmen tribes, by the 16th century, most of those tribes were under the nominal control of two sedentary Uzbek khanates, Khiva and Bukhoro. Turkmen soldiers were an important element of the Uzbek militaries of this period, in the 19th century, raids and rebellions by the Yomud Turkmen group resulted in that groups dispersal by the Uzbek rulers. According to Paul R. Spickard, Prior to the Russian conquest, Russian forces began occupying Turkmen territory late in the 19th century. From their Caspian Sea base at Krasnovodsk, the Russians eventually overcame the Uzbek khanates, in 1916 the Russian Empires participation in World War I resonated in Turkmenistan, as an anticonscription revolt swept most of Russian Central Asia. In 1924 the Turkmen Soviet Socialist Republic was formed from the tsarist province of Transcaspia, by the late 1930s, Soviet reorganization of agriculture had destroyed what remained of the nomadic lifestyle in Turkmenistan, and Moscow controlled political life. The Ashgabat earthquake of 1948 killed over 110,000 people, during the next half-century, Turkmenistan played its designated economic role within the Soviet Union and remained outside the course of major world events
8.
Herat
–
Herat is the third-largest city of Afghanistan. It has a population of about 436,300, and serves as the capital of Herat Province and it is linked with Kandahar and Mazar-e-Sharif via highway 1 or the ring road. It is further linked to the city of Mashhad in neighboring Iran through the town of Islam Qala. Herat dates back to the Avestan times and was known for its wine. The city has a number of sites, including the Herat Citadel. During the Middle Ages Herat became one of the important cities of Khorasan and it has been governed by various Afghan rulers since the early 18th century. In 1717, the city was invaded by the Hotaki forces until they were expelled by the Afsharids in 1736, after Nader Shahs death and Ahmad Shah Durranis rise to power in 1747, Herat became part of Afghanistan. It witnessed some political disturbances and military invasions during the half of the 19th century. Herat suffered from destruction during the Soviet war in the 1980s. Herat lies on the ancient trade routes of the Middle East, Central, the roads from Herat to Iran, Turkmenistan, and other parts of Afghanistan are still strategically important. As the gateway to Iran, it collects high amount of revenue for Afghanistan. The city has an international airport, Herat is a regional hub in western Afghanistan in close proximity to Iran and Turkmenistan. The city has high residential density clustered around the core of the city, however, vacant plots account for a higher percentage of the city than residential land use and agricultural is the largest percentage of total land use. Herat dates back to ancient times, but its exact age remains unknown, during the period of the Achaemenid Empire, the surrounding district was known as Hariva, and in classical sources the region was correspondingly known as Aria. In the Zoroastrian Avesta, the district is mentioned as Haroiva, the name of the district and its main town is derived from that of the chief river of the region, the Herey River, which traverses the district and passes some 5 km south of modern Herāt. Herey is mentioned in Sanskrit as yellow or golden color equivalent to Persian Zard meaning Gold, the naming of a region and its principal town after the main river is a common feature in this part of the world—compare the adjoining districts/rivers/towns of Arachosia and Bactria. The district Aria of the Achaemenid Empire is mentioned in the lists that are included in various royal inscriptions, for instance. Representatives from the district are depicted in reliefs, e. g. at the royal Achaemenid tombs of Naqsh-e Rustam and they are wearing Scythian-style dress and a twisted Bashlyk that covers their head, chin and neck
9.
Faryab Province
–
Faryab is one of the thirty-four provinces of Afghanistan, which is located in the north of the country bordering neighboring Turkmenistan. It has a population of about 948,000, which is multi-ethnic, the province encompasses 15 districts and over 1,000 villages. The capital of Faryab province is Maymana, Faryab is a Persian toponym meaning lands irrigated by diversion of river water. It is named after a town that was founded by the Sassanids and it is the hometown to the famed Islamic philosopher, al-Farabi, per the biographer Ibn al-Nadim. The area has part of Greater Khorasan. British geographers referred to the area as Afghan Turkestan, the history of settlement in Faryab is ancient and comprises layer upon layer of occupation. At times, it was a pot within which a host of cultures have merged into a non-conflictual whole or at least peaceable coexistence. Maymana and Andkhui actually entered written history 2,500 years ago when Jews arrived and settled in 586 BC, the territory was under Persian control at the time, which later gave way to Greek rule following the conquest by Alexander the Great in 326 BC. Persian dominance was restored from the 3rd to the 7th century AD, the pre-Islamic period ended with the conquest of northern Afghanistan by Arab Muslims. The area turned into a vast battlefield as the two great Arab and Persian cultures battled for not only political and geographical supremacy but ideological supremacy, as a result, centuries of Zoroastrianism, Buddhism, Nestorian Christianity and indigenous pagan cults were swept away. Various Islamic dynasties rose to power and influenced the locals and they included the Saffarids, Samanids, Ghaznavids, Seljuks, and Ghurids. The history of Faryab was greatly altered yet again in the 11th century, as he moved into the area from the north, cities and towns including Maymana were razed, populations massacred, grain, fields and livestock stolen or burnt and ancient irrigation systems obliterated. Control by the descendants of Genghis Khan stemmed from the capitals of Bukhara or Samarkand north of the Amu Darya River. They ruled in a manner, however, allowing local tribal chiefs in Maymana and elsewhere considerable autonomy. Uzbek occupation of the area began within the Turko-Mongol period, in 1500, Uzbek princes, also known as Khanate of Bukhara, themselves a Turco-Mongol product, swept across the Amu Darya, reaching Faryab and related areas around 1505. They joined a substantial and largely pastoral Arab population and ruled the area until the mid-18th century and it was conquered by Ahmad Shah Durrani in 1748 and became part of the Durrani Empire. The area was untouched by the British during the three Anglo-Afghan wars that were fought in the 19th and 20th centuries, Faryab become a province in 1964. From the administrative reforms of the 1930s until then it was known as Maymana and was a sub-province of Balkh Province, which had its headquarters in Mazar-i-Sharif
10.
Loess
–
Loess is a clastic, predominantly silt-sized sediment that is formed by the accumulation of wind-blown dust. It covers about 10% of the Earths surface and it is usually homogeneous and highly porous and is traversed by vertical capillaries that permit the sediment to fracture and form vertical bluffs. It was first applied to Rhine River valley loess about 1821, Loess is homogeneous, porous, friable, pale yellow or buff, slightly coherent, typically non-stratified and often calcareous. Loess grains are angular with little polishing or rounding and composed of crystals of quartz, feldspar, mica, Loess can be described as a rich, dust-like soil. Loess deposits may become thick, more than a hundred meters in areas of China. It generally occurs as a deposit that covers areas of hundreds of square kilometers. Loess often stands in either steep or vertical faces, because the grains are angular, loess will often stand in banks for many years without slumping. This soil has a characteristic called vertical cleavage which makes it easily excavated to form cave dwellings, in several areas of the world, loess ridges have formed that are aligned with the prevailing winds during the last glacial maximum. These are called paha ridges in America and greda ridges in Europe, the form of these loess dunes has been explained by a combination of wind and tundra conditions. Loess comes from the German Löss or Löß, and ultimately from Alemannic lösch meaning loose as named by peasants, the term Löß was first described in Central Europe by Karl Cäsar von Leonhard who reported yellowish brown, silty deposits along the Rhine valley near Heidelberg. Charles Lyell brought this term into usage by observing similarities between loess and loess derivatives along the loess bluffs in the Rhine and Mississippi. At that time it was thought that the yellowish brown silt-rich sediment was of fluvial origin being deposited by the large rivers. It wasnt until the end of the 19th century that the origin of loess was recognized. A tremendous number of papers have been published since then, focusing on the formation of loess and on loess/palaeosol sequences as archives of climate and these water conservation works were carried out extensively in China and the research of Loess in China has been continued since 1954. Much effort was put into the setting up of regional and local loess stratigraphies, and Frechen, Horváth & Gábris for the Austrian and Hungarian loess stratigraphy, respectively. During the autumn and winter, when melting of the icesheets and icecaps ceased, as a consequence, large parts of the formerly submerged and unvegetated floodplains of these braided rivers dried out and were exposed to the wind. Because these floodplains consist of sediment containing a high content of glacially ground flour-like silt and clay, they were susceptible to winnowing of their silts. Once entrained by the wind, particles were then deposited downwind, the loess deposits found along both sides of the Mississippi River Alluvial Valley are a classic example of periglacial loess
11.
Aeolian processes
–
Aeolian processes, also spelled eolian or æolian, pertain to wind activity in the study of geology and weather and specifically to the winds ability to shape the surface of the Earth. Winds may erode, transport, and deposit materials and are effective agents in regions with sparse vegetation, a lack of soil moisture, although water is a much more powerful eroding force than wind, aeolian processes are important in arid environments such as deserts. The term is derived from the name of the Greek god Aeolus, wind erodes the Earths surface by deflation and by abrasion. Regions which experience intense and sustained erosion are called deflation zones, most aeolian deflation zones are composed of desert pavement, a sheet-like surface of rock fragments that remains after wind and water have removed the fine particles. Almost half of Earths desert surfaces are stony deflation zones, the rock mantle in desert pavements protects the underlying material from deflation. A dark, shiny stain, called desert varnish or rock varnish, is found on the surfaces of some desert rocks that have been exposed at the surface for a long period of time. Manganese, iron oxides, hydroxides, and clay minerals form most varnishes, deflation basins, called blowouts, are hollows formed by the removal of particles by wind. Blowouts are generally small, but may be up to kilometers in diameter. In parts of Antarctica wind-blown snowflakes that are technically sediments have also caused abrasion of exposed rocks, grinding by particles carried in the wind creates grooves or small depressions. Ventifacts are rocks which have cut, and sometimes polished. Sculpted landforms, called yardangs, are up to tens of meters high, the famous Great Sphinx of Giza in Egypt may be a modified yardang. Particles are transported by winds through suspension, saltation and creeping along the ground, small particles may be held in the atmosphere in suspension. Upward currents of air support the weight of suspended particles and hold them indefinitely in the surrounding air, typical winds near Earths surface suspend particles less than 0.2 millimeters in diameter and scatter them aloft as dust or haze. Saltation is downwind movement of particles in a series of jumps or skips, saltation normally lifts sand-size particles no more than one centimeter above the ground and proceeds at one-half to one-third the speed of the wind. A saltating grain may hit other grains that jump up to continue the saltation, the grain may also hit larger grains that are too heavy to hop, but that slowly creep forward as they are pushed by saltating grains. Surface creep accounts for as much as 25 percent of grain movement in a desert, aeolian turbidity currents are better known as dust storms. Air over deserts is cooled significantly when rain passes through it and this cooler and denser air sinks toward the desert surface. When it reaches the ground, the air is deflected forward, crops, people, villages, and possibly even climates are affected by dust storms
Afghanistan
Chisholm, Hugh, ed. (1911). "Badghis". Encyclopædia Britannica. 3 (11th ed.). Cambridge University Press.
Chisholm, Hugh, ed. (1911). "
Badghis Province
