1.
Asia
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Asia covers an area of 44,579,000 square kilometres, about 30% of Earths total land area and 8. 7% of the Earths total surface area. The continent, which has long been home to the majority of the population, was the site of many of the first civilizations. Asia is notable for not only its large size and population. In general terms, Asia is bounded on the east by the Pacific Ocean, on the south by the Indian Ocean, the western boundary with Europe is a historical and cultural construct, as there is no clear physical and geographical separation between them. The most commonly accepted boundaries place Asia to the east of the Suez Canal, the Ural River, and the Ural Mountains, and south of the Caucasus Mountains, China and India alternated in being the largest economies in the world from 1 to 1800 A. D. The accidental discovery of America by Columbus in search for India demonstrates this deep fascination, the Silk Road became the main East-West trading route in the Asian hitherland while the Straits of Malacca stood as a major sea route. Asia has exhibited economic dynamism as well as robust population growth during the 20th century, given its size and diversity, the concept of Asia—a name dating back to classical antiquity—may actually have more to do with human geography than physical geography. Asia varies greatly across and within its regions with regard to ethnic groups, cultures, environments, economics, historical ties, the boundary between Asia and Africa is the Red Sea, the Gulf of Suez, and the Suez Canal. This makes Egypt a transcontinental country, with the Sinai peninsula in Asia, the border between Asia and Europe was historically defined by European academics. In Sweden, five years after Peters death, in 1730 Philip Johan von Strahlenberg published a new atlas proposing the Urals as the border of Asia, the Russians were enthusiastic about the concept, which allowed them to keep their European identity in geography. Tatishchev announced that he had proposed the idea to von Strahlenberg, the latter had suggested the Emba River as the lower boundary. Over the next century various proposals were made until the Ural River prevailed in the mid-19th century, the border had been moved perforce from the Black Sea to the Caspian Sea into which the Ural River projects. The border between the Black Sea and the Caspian is usually placed along the crest of the Caucasus Mountains, the border between Asia and the loosely defined region of Oceania is usually placed somewhere in the Malay Archipelago. The terms Southeast Asia and Oceania, devised in the 19th century, have had several different geographic meanings since their inception. The chief factor in determining which islands of the Malay Archipelago are Asian has been the location of the possessions of the various empires there. Lewis and Wigen assert, The narrowing of Southeast Asia to its present boundaries was thus a gradual process, Asia is larger and more culturally diverse than Europe. It does not exactly correspond to the borders of its various types of constituents. From the time of Herodotus a minority of geographers have rejected the three-continent system on the grounds there is no or is no substantial physical separation between them
2.
South Asia
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Topographically, it is dominated by the Indian Plate, which rises above sea level as Nepal and northern parts of India situated south of the Himalayas and the Hindu Kush. South Asia is bounded on the south by the Indian Ocean and on land by West Asia, Central Asia, East Asia, the current territories of Afghanistan, Bangladesh, Bhutan, Maldives, Nepal, India, Pakistan, and Sri Lanka form the countries of South Asia. The South Asian Association for Regional Cooperation is an economic cooperation organisation in the region which was established in 1985, South Asia covers about 5.1 million km², which is 11. 51% of the Asian continent or 3. 4% of the worlds land surface area. The population of South Asia is about 1.749 billion or about one fourth of the worlds population, overall, it accounts for about 39. 49% of Asias population and is home to a vast array of peoples. The area of South Asia and its extent is not clear cut as systemic. Aside from the region of South Asia, formerly part of the British Empire, there is a high degree of variation as to which other countries are included in South Asia. Modern definitions of South Asia are consistent in including Afghanistan, India, Pakistan, Bangladesh, Sri Lanka, Nepal, Bhutan, Myanmar is included by some scholars in South Asia, but in Southeast Asia by others. Some do not include Afghanistan, others question whether Afghanistan should be considered a part of South Asia or the Middle East, the mountain countries of Nepal and Bhutan, and the island countries of Sri Lanka and Maldives are generally included as well. Myanmar is often added, and by various deviating definitions based on often substantially different reasons, the British Indian Ocean Territory, the common concept of South Asia is largely inherited from the administrative boundaries of the British Raj, with several exceptions. The Aden Colony, British Somaliland and Singapore, though administered at various times under the Raj, have not been proposed as any part of South Asia. Additionally Burma was administered as part of the Raj until 1937, the 562 princely states that were protected by but not directly ruled by the Raj became administrative parts of South Asia upon joining Union of India or Dominion of Pakistan. China and Myanmar have also applied for the status of members of SAARC. This bloc of countries include two independent countries that were not part of the British Raj – Nepal, and Bhutan, Afghanistan was a British protectorate from 1878 until 1919, after the Afghans lost to the British in the Second Anglo-Afghan war. The United Nations Statistics Divisions scheme of sub-regions include all eight members of the SAARC as part of Southern Asia, population Information Network includes Afghanistan, Bangladesh, Burma, India, Nepal, Pakistan and Sri Lanka as part of South Asia. Maldives, in view of its characteristics, was admitted as a member Pacific POPIN subregional network only in principle, the Hirschman–Herfindahl index of the United Nations Economic and Social Commission for Asia and the Pacific for the region includes only the original seven signatories of SAARC. The British Indian Ocean Territory is connected to the region by a publication of Janes for security considerations, the inclusion of Myanmar in South Asia is without consensus, with many considering it a part of southeast Asia and others including it within South Asia. Afghanistan was of importance to the British colonial empire, especially after the Second Anglo-Afghan War over 1878–1880, Afghanistan remained a British protectorate until 1919, when a treaty with Vladimir Lenin included the granting of independence to Afghanistan. Following Indias partition, Afghanistan has generally included in South Asia
3.
Central Asia
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Central Asia stretches from the Caspian Sea in the west to China in the east and from Afghanistan in the south to Russia in the north. It is also referred to as the -stans as the five countries generally considered to be within the region all have names ending with the Persian suffix -stan. Central Asias five former Soviet republics are Kazakhstan, Kyrgyzstan, Tajikistan, Turkmenistan, Central Asia has historically been closely tied to its nomadic peoples and the Silk Road. It has acted as a crossroads for the movement of people, goods, the Silk Road connected Muslim lands with the people of Europe, India, and China. This crossroads position has intensified the conflict between tribalism and traditionalism and modernization, in pre-Islamic and early Islamic times, Central Asia was predominantly Iranian, peopled by Eastern Iranian-speaking Bactrians, Sogdians and Chorasmians and the semi-nomadic Scythians and Parthians. Central Asia is sometimes referred to as Turkestan, the idea of Central Asia as a distinct region of the world was introduced in 1843 by the geographer Alexander von Humboldt. The borders of Central Asia are subject to multiple definitions, historically built political geography and geoculture are two significant parameters widely used in the scholarly literature about the definitions of the Central Asia. The most limited definition was the one of the Soviet Union. This definition was also used outside the USSR during this period. However, the Russian culture has two terms, Средняя Азия and Центральная Азия. Since then, this has become the most common definition of Central Asia, the UNESCO general history of Central Asia, written just before the collapse of the USSR, defines the region based on climate and uses far larger borders. An alternative method is to define the region based on ethnicity and these areas include Xinjiang Uyghur Autonomous Region, the Turkic regions of southern Siberia, the five republics, and Afghan Turkestan. Afghanistan as a whole, the northern and western areas of Pakistan, the Tibetans and Ladakhi are also included. Insofar, most of the peoples are considered the indigenous peoples of the vast region. Central Asia is a large region of varied geography, including high passes and mountains, vast deserts. The vast steppe areas of Central Asia are considered together with the steppes of Eastern Europe as a geographical zone known as the Eurasian Steppe. Much of the land of Central Asia is too dry or too rugged for farming, the Gobi desert extends from the foot of the Pamirs, 77° E, to the Great Khingan Mountains, 116°–118° E. Central Asia has the following geographic extremes, The worlds northernmost desert, at Buurug Deliin Els, Mongolia, the Northern Hemispheres southernmost permafrost, at Erdenetsogt sum, Mongolia, 46°17′ N
4.
Tajikistan
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Tajikistan, officially the Republic of Tajikistan, is a mountainous, landlocked country in Central Asia with an estimated 8 million people in 2013, and an area of 143,100 km2. It is bordered by Islamic Republic of Afghanistan to the south, the Republic of Uzbekistan to the west, the Kyrgyz Republic to the north, the Islamic Republic of Pakistan lies to the south, separated by the narrow Wakhan Corridor. Traditional homelands of Tajik people included present-day Tajikistan, Afghanistan and Uzbekistan, a civil war was fought almost immediately after independence, lasting from 1992 to 1997. Since the end of the war, newly established political stability, Tajikistan is a presidential republic consisting of four provinces. Most of Tajikistans 8 million people belong to the Tajik ethnic group, many Tajiks also speak Russian as their second language. Mountains cover more than 90% of the country and it has a transition economy that is highly dependent on remittances, aluminium and cotton production. Tajikistan means the Land of the Tajiks, the suffix -stan is Persian for place of or country and Tajik is, most likely, the name of a pre-Islamic tribe. Tajikistan appeared as Tadjikistan or Tadzhikistan in English prior to 1991 and this is due to a transliteration from the Russian, Таджикистан. In Russian, there is no single letter j to represent the phoneme /ʤ/ and дж, Tadzhikistan is the most common alternate spelling and is widely used in English literature derived from Russian sources. Tadjikistan is the spelling in French and can occasionally be found in English language texts, the way of writing Tajikistan in the Perso-Arabic script is. The earliest recorded history of the dates back to about 500 BCE when much, if not all. After the regions conquest by Alexander the Great it became part of the Greco-Bactrian Kingdom, northern Tajikistan was part of Sogdia, a collection of city-states which was overrun by Scythians and Yuezhi nomadic tribes around 150 BCE. The Silk Road passed through the region and following the expedition of Chinese explorer Zhang Qian during the reign of Wudi commercial relations between Han China and Sogdiana flourished. Sogdians played a role in facilitating trade and also worked in other capacities, as farmers, carpetweavers, glassmakers. Later the Hephthalite Empire, a collection of tribes, moved into the region. Central Asia continued in its role as a crossroads, linking China, the steppes to the north. It was temporarily under the control of the Tibetan empire and Chinese from 650–680, the Samanid Empire,819 to 999, restored Persian control of the region and enlarged the cities of Samarkand and Bukhara which became the cultural centres of Iran and the region was known as Khorasan. The Kara-Khanid Khanate conquered Transoxania and ruled between 999–1211, during Genghis Khans invasion of Khwarezmia in the early 13th century the Mongol Empire took control over nearly all of Central Asia
5.
Iran
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Iran, also known as Persia, officially the Islamic Republic of Iran, is a sovereign state in Western Asia. Comprising a land area of 1,648,195 km2, it is the second-largest country in the Middle East, with 82.8 million inhabitants, Iran is the worlds 17th-most-populous country. It is the country with both a Caspian Sea and an Indian Ocean coastline. The countrys central location in Eurasia and Western Asia, and its proximity to the Strait of Hormuz, Tehran is the countrys capital and largest city, as well as its leading economic and cultural center. Iran is the site of to one of the worlds oldest civilizations, the area was first unified by the Iranian Medes in 625 BC, who became the dominant cultural and political power in the region. The empire collapsed in 330 BC following the conquests of Alexander the Great, under the Sassanid Dynasty, Iran again became one of the leading powers in the world for the next four centuries. Beginning in 633 AD, Arabs conquered Iran and largely displaced the indigenous faiths of Manichaeism and Zoroastrianism by Islam, Iran became a major contributor to the Islamic Golden Age that followed, producing many influential scientists, scholars, artists, and thinkers. During the 18th century, Iran reached its greatest territorial extent since the Sassanid Empire, through the late 18th and 19th centuries, a series of conflicts with Russia led to significant territorial losses and the erosion of sovereignty. Popular unrest culminated in the Persian Constitutional Revolution of 1906, which established a monarchy and the countrys first legislative body. Following a coup instigated by the U. K. Growing dissent against foreign influence and political repression led to the 1979 Revolution, Irans rich cultural legacy is reflected in part by its 21 UNESCO World Heritage Sites, the third-largest number in Asia and 11th-largest in the world. Iran is a member of the UN, ECO, NAM, OIC. Its political system is based on the 1979 Constitution which combines elements of a democracy with a theocracy governed by Islamic jurists under the concept of a Supreme Leadership. A multicultural country comprising numerous ethnic and linguistic groups, most inhabitants are Shia Muslims, the largest ethnic groups in Iran are the Persians, Azeris, Kurds and Lurs. Historically, Iran has been referred to as Persia by the West, due mainly to the writings of Greek historians who called Iran Persis, meaning land of the Persians. As the most extensive interactions the Ancient Greeks had with any outsider was with the Persians, however, Persis was originally referred to a region settled by Persians in the west shore of Lake Urmia, in the 9th century BC. The settlement was then shifted to the end of the Zagros Mountains. In 1935, Reza Shah requested the international community to refer to the country by its native name, opposition to the name change led to the reversal of the decision, and Professor Ehsan Yarshater, editor of Encyclopædia Iranica, propagated a move to use Persia and Iran interchangeably
6.
Turkmenistan
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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
7.
Uzbekistan
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Uzbekistan, officially the Republic of Uzbekistan, is one of only two doubly landlocked countries in the world. Located in Central Asia, it is a unitary, constitutional, presidential republic, comprising twelve provinces, one autonomous republic and a capital city. Uzbekistan is bordered by five landlocked countries, Kazakhstan to the north, Tajikistan to the southeast, Kyrgyzstan to the northeast, Afghanistan to the south, and Turkmenistan to the southwest. Once part of the Turkic Khaganate and later Timurid Empires, the region that includes the Republic of Uzbekistan was conquered in the early 16th century by Eastern Turkic-speaking nomads. Following the breakup of the Soviet Union, it declared independence as the Republic of Uzbekistan on 31 August 1991, Uzbekistan is officially a democratic, secular, unitary, constitutional republic with a diverse cultural heritage. The countrys official language is Uzbek, a Turkic language written in the Latin alphabet and spoken natively by approximately 85% of the population, however, Uzbeks constitute 81% of the population, followed by Russians, Tajiks, Kazakhs, and others. A majority of Uzbeks are non-denominational Muslims, Uzbekistan is a member of the Commonwealth of Independent States, Organization for Security and Co-operation in Europe, UN, and the SCO. While officially a republic, non-governmental human rights organizations define Uzbekistan as an authoritarian state with limited civil rights. Uzbekistans economy relies mainly on commodity production, including cotton, gold, uranium, despite the declared objective of transition to a market economy, its government continues to maintain economic controls which imports in favour of domestic import substitution. Uzbekistan has an area of 447,400 square kilometres and it is the 56th largest country in the world by area and the 42nd by population. Among the CIS countries, it is the 4th largest by area, Uzbekistan lies between latitudes 37° and 46° N, and longitudes 56° and 74° E. It stretches 1,425 kilometres from west to east and 930 kilometres from north to south, Uzbekistan also shares a short border with Afghanistan to the south. Uzbekistan is a dry, landlocked country and it is one of two doubly landlocked countries in the world, the other being Liechtenstein. In addition, due to its location within a series of endorheic basins, less than 10% of its territory is intensively cultivated irrigated land in river valleys and oases. The rest is vast desert and mountains, the climate in the Republic of Uzbekistan is continental, with little precipitation expected annually. The average summer high temperature tends to be 40 °C, while the winter low temperature is around −23 °C. Uzbekistan has a rich and diverse natural environment, the Aral Sea used to be the fourth-largest inland sea on Earth, acting as an influencing factor in the air moisture and arid land use. Since the 1960s, the decade when the misuse of the Aral Sea water began, it has shrunk to less than 50% of its former area, reliable, or even approximate data, have not been collected, stored or provided by any organization or official agency
8.
China
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China, officially the Peoples Republic of China, is a unitary sovereign state in East Asia and the worlds most populous country, with a population of over 1.381 billion. The state is governed by the Communist Party of China and its capital is Beijing, the countrys major urban areas include Shanghai, Guangzhou, Beijing, Chongqing, Shenzhen, Tianjin and Hong Kong. China is a power and a major regional power within Asia. Chinas landscape is vast and diverse, ranging from forest steppes, the Himalaya, Karakoram, Pamir and Tian Shan mountain ranges separate China from much of South and Central Asia. The Yangtze and Yellow Rivers, the third and sixth longest in the world, respectively, Chinas coastline along the Pacific Ocean is 14,500 kilometers long and is bounded by the Bohai, Yellow, East China and South China seas. China emerged as one of the worlds earliest civilizations in the basin of the Yellow River in the North China Plain. For millennia, Chinas political system was based on hereditary monarchies known as dynasties, in 1912, the Republic of China replaced the last dynasty and ruled the Chinese mainland until 1949, when it was defeated by the communist Peoples Liberation Army in the Chinese Civil War. The Communist Party established the Peoples Republic of China in Beijing on 1 October 1949, both the ROC and PRC continue to claim to be the legitimate government of all China, though the latter has more recognition in the world and controls more territory. China had the largest economy in the world for much of the last two years, during which it has seen cycles of prosperity and decline. Since the introduction of reforms in 1978, China has become one of the worlds fastest-growing major economies. As of 2016, it is the worlds second-largest economy by nominal GDP, China is also the worlds largest exporter and second-largest importer of goods. China is a nuclear weapons state and has the worlds largest standing army. The PRC is a member of the United Nations, as it replaced the ROC as a permanent member of the U. N. Security Council in 1971. China is also a member of numerous formal and informal multilateral organizations, including the WTO, APEC, BRICS, the Shanghai Cooperation Organization, the BCIM, the English name China is first attested in Richard Edens 1555 translation of the 1516 journal of the Portuguese explorer Duarte Barbosa. The demonym, that is, the name for the people, Portuguese China is thought to derive from Persian Chīn, and perhaps ultimately from Sanskrit Cīna. Cīna was first used in early Hindu scripture, including the Mahābhārata, there are, however, other suggestions for the derivation of China. The official name of the state is the Peoples Republic of China. The shorter form is China Zhōngguó, from zhōng and guó and it was then applied to the area around Luoyi during the Eastern Zhou and then to Chinas Central Plain before being used as an occasional synonym for the state under the Qing
9.
Noshaq
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Noshaq is the highest peak in Afghanistan and the second highest peak in the Hindu Kush Range at 7,492 m. It lies on the border between Badakhshan Province in Afghanistan and Chitral District, Khyber Pakhtunkhwa, Pakistan, and is the worlds westernmost 7,000 meter massif, Noshaq was first climbed by a Japanese expedition in 1960 led by Professor Sakato. Other members of the expedition were Goro Iwatsabo and Toshiaki Sakai, the climb followed the normal Pakistan approach, the southeast ridge from the Qadzi Deh Glacier. The normal Afghanistan approach route is by the west ridge, the first winter ascent was in 1973 by Tadeusz Piotrowski and Andrzej Zawada, members of a Polish expedition, via the north face. It was the world’s first winter climb of any 7000m peak, only the main peak and Noshaq West are on the Afghanistan-Pakistan border, a watershed divide. The other peaks of this massif lie well within Pakistan and are accessible from Chitral,64 km away. The west side of the massif is in Afghanistan whereas the south, the second highest peak in this massif is Noshaq East, climbed in 1963 by Dr. Gerald Gruber and Rudolf Pischenger from Austria. The third highest peak of the massif is Noshaq Central followed by Noshaq West and these peaks were also climbed by the same Austrian expedition of 1963. The mountain is 28 km from Qazi Deh village in Afghanistan, Qazi Deh is 280 km away from Kabul, Afghanistan, the easiest access to Noshaq is from Chitral, Pakistan which is linked to Islamabad by flights. The first Afghan ascent of the mountain was in July 2009, two members of a team of four Afghans from the Wakhan Corridor summited on July 19
10.
Amu Darya
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The Amu Darya, also called the Amu River and historically known by its Latin name, Oxus, is a major river in Central Asia. It is formed by the junction of the Vakhsh and Panj rivers, at Qaleh-ye Panjeh in Afghanistan, in ancient times, the river was regarded as the boundary between Greater Iran and Turan. In classical antiquity, the river was known as the Ōxus in Latin and Ὦξος Ôxos in Greek—a clear derivative of Vakhsh, in Vedic Sanskrit, the river is also referred to as Vakṣu. The Avestan texts too refer to the River as Yakhsha/Vakhsha, in Middle Persian sources of the Sassanid period the river is known as Wehrōd. The name Amu is said to have come from the city of Āmul, in modern Turkmenistan. Medieval Arabic and Muslim sources call the river Jayhoun which is derived from Gihon, however, this name is no longer used. Hara and to the river of Gozan (that is to say, the Amu. the Gozan River is the River Balkh, i. e. the Oxus or the Amu Darya. and were brought into Halah, and Habor, and Hara, and to the river Gozan. The rivers total length is 2,400 kilometres and its drainage basin totals 534,739 square kilometres in area, the river is navigable for over 1,450 kilometres. All of the water comes from the mountains in the south where annual precipitation can be over 1,000 mm. An ice cave at the end of the Wakhjir valley, in the Wakhan Corridor, in the Pamir Mountains, a glacier turns into the Wakhan River and joins the Pamir River about 50 kilometres downstream. Therefore, the Chelab stream may be considered the true source or parent stream of the Oxus. The Panj River forms the border of Afghanistan and Tajikistan and it flows west to Ishkashim where it turns north and then north-west through the Pamirs passing the Tajikistan–Afghanistan Friendship Bridge. It subsequently forms the border of Afghanistan and Uzbekistan for about 200 kilometres, passing Termez and it delineates the border of Afghanistan and Turkmenistan for another 100 kilometres before it flows into Turkmenistan at Atamurat. As the Amudarya, it flows across Turkmenistan south to north, passing Türkmenabat, use of water from the Amu Darya for irrigation has been a major contributing factor to the shrinking of the Aral Sea since the late 1950s. Historical records state that in different periods, the river flowed into the Aral Sea, into the Caspian Sea, about 1,385,045 square kilometres of land is drained by the Amu Darya into the Aral Sea endorheic basin. This includes most of Tajikistan, the southwest corner of Kyrgyzstan, the northeast corner of Afghanistan, part of the Amu Daryas drainage divide in Tajikistan forms that countrys border with China and Pakistan. About 61% of the lies within Tajikistan, Uzbekistan and Turkmenistan. Of the area drained by the Amu Darya, only about 200,000 square kilometres actively contribute water to the river and this is because many of the rivers major tributaries have been diverted, and much of the rivers drainage is dominated by outlying desert and steppe
11.
Helmand River
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The Helmand River is the longest river in Afghanistan and the primary watershed for the endorheic Sistan Basin. The name comes from Avestan Haētumant, literally dammed, having a dam, which referred to the Helmand River, the name was borrowed into Greek and Latin as a compound with Eastern Iranian *raha, river. Helmand Province is named after the river, the Helmand River stretches for 1,150 km. It rises in the Hindu Kush mountains, about 80 km west of Kabul, passing north of the Unai Pass, in the proximities of Hazarajat, in Behsud, flows west to Daykundi. It crosses south-west through the desert of Dashti Margo, to the Seistan marshes, the river remains relatively salt-free for much of its length, unlike most rivers with no outlet to the sea. This river, managed by the Helmand and Arghandab Valley Authority is used extensively for irrigation and its waters are essential for farmers in Afghanistan, but it feeds into Lake Hamun and is also important to farmers in Irans southeastern Sistan and Baluchistan province. A number of dams have created artificial reservoirs on some of the Afghanistans rivers including the Kajakai on the Helmand River. The chief tributary of the Helmand river is the Arghandab River which also has a major dam north of Kandahar, the boundaries of the province of Helmand were once known as kingdom of Sakastan. The Helmand valley region is mentioned by name in the Avesta as the Aryan land of Haetumant, but owing to the preponderance of Hindus and Buddhists, the Helmand and Kabul regions were also known as White India in those days. The Hindu Zunbils were also located here, some Vedic scholars also believe the Helmand valley corresponds to the Sarasvati area mentioned in the Rig Veda as the homeland for the Indo-Aryan migrations into India, ca.1500 BC. Six major discoveries by Italian Archaeologist in Swat District of Khyber Pukhtunkhwa Province of Pakistan regarding the river have been discussed in the book The History of Communication, list of rivers of Afghanistan Kajaki Dam Various authors. Vogelsang, W. Early historical Arachosia in South-east Afghanistan, Meeting-place between East and West, from Wetland to Wasteland, The Destruction of the Hamoun Oasis
12.
Kajaki Dam
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The Kajakai Dam is one of the two major hydroelectric power dams of Helmand province in southern Afghanistan. The dam is located on the Helmand River 100 miles north-west of Kandahar and is operated by the Helmand and it has a dual function, to provide electricity and to irrigate some 650,000 acres of an otherwise arid land. Water discharging from the dam traverses some 300 miles of irrigation canals feeding farmland. It currently produces 33 megawatts of electricity, the dam is 100 m high and 270 m long, with a gross storage capacity of 1,715,000,000 m3 of water. The dam controls the output of the watershed which feeds the Sistan Basin. Final studies for the dam began in 1946 and a design was crafted in 1950. The dam was built between 1951 and 1953 by the Morrison-Knudsen firm as part of the Helmand Valley Authority project, in 1975, USAID commissioned the initial installation of two 16.5 MW generating units in a powerhouse constructed at the toe of the dam. This first stage powerhouse was constructed to house three equally sized units. Only units 1 and 3 were installed originally, when the Soviets invaded Afghanistan in 1979 the contractors left. They had intended to raise the dam by 2 meters in order to increase the water for power production and irrigation. They were also excavating an emergency spillway which was never completed, gates were also never installed in the service spillway so the dam passes all water in the reservoir above elevation 1033.5 meters. Completion of the gates would increase the total storage capacity of the reservoir by 1,010,000,000 m3 to 2,725,000,000 m3. The Kajaki dam powerhouse was a target of the US Air Force during their attack on Afghanistan in October 2001. With funding from USAID, World Bank and other donors, Units 1 &3 have been fully rehabilitated, Unit 1 was operational in September 2005 and Unit 3 in October 2009. The Unit 3 rehabilitation began in May 2006, with a return to service in early 2007. The new 18.5 MW Unit 2 turbine/generator has been contracted to China Machine Building International Corporation, engineering, design and procurement are ongoing. The work will be supervised by Montgomery Watson Harza and was planned to be completed by June 2007, in February 2007, the Kajakai Dam was the subject of fighting between NATO and Taliban insurgents, as part of Operation Kryptonite. According to the governor of Helmand province, Assadullah Wafa, over 700 Taliban insurgents coming from neighboring Pakistan fought against over 300 NATO troops, most of the NATO troops were Dutch and British
13.
Dahla Dam
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The Dahla Dam is the largest dam in Kandahar Province, and the second largest in Afghanistan. Over the years during the due to neglect the project was subject to siltation of the reservoir. This component is now under implementation with financial and technical support from the US government The dam is 34 kilometres north of the Kandahar City in the Kandhar Province and it is built on the Arghandab River which flows over a length of 250 miles. The Dahla Dam was first built with funding and technical support provided by the US government. The dam is an embankment structure made of earth and rock fill and it is 55 metres in height. The length of the dam at the crest is about 535 metres, in the periphery of the dam six saddle dams have been built which together measure 2,040 metres and with varying heights of 15–25 metres. To pass the design flood discharge two spillway structures have been built, the reservoir created by the dam has a storage capacity of 314 MCM. The contractor for the project was Morrison-Knudsen Afghanistan Incorporated, the dam and the irrigation system are under the control of the Helmand and Arghandab Valley Authority. After completion of the dam in 1952, it functioned well for many decades, however, the irrigation system and its operation was neglected during the Soviet Unions occupation of the country in 1979 and later by the Taliban who ruled till the end of 2001. The intake tower of the dam was not functioning properly and control valves were leaking, spillway capacity to discharge flood waters was inadequate, after this operation, a two-phase rehabilitation plan was launched. Raising the height of the dam is seen crucial to increasing the volume of available water, the work has been initiated by the United States Army Corp of Engineers and is slated for completion by 2017. This component of the project is estimated to cost US$308 million with the Finance Ministry of Afghanistan providing $38 million, list of dams and reservoirs in Afghanistan Dahla Dam Irrigation Release US ARMY CORPS OF ENGINEERS &77 CONSTRUCTION COMPANY DAHLA DAM IMPROVEMENT PROJECT PHASE1
14.
Naghlu Dam
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The Naghlu Dam is a gravity dam on the Kabul River in Surobi District, Kabul Province, Afghanistan. It is located 40 km east of the Afghan capital Kabul, the primary purpose of the dam is hydroelectric power generation and its supports a power station with a design capacity of 100 MW. It is the largest power plant in Afghanistan and generates most of Kabuls electricity and it is currently being rehabilitated and only three of the four generators are operational. The dam is 110 m tall,280 m long and its reservoir has a capacity of 550,000,000 m3. Construction of the dam was financed and supervised by the Soviet Union between January 1960 and 1968, the first generator was commissioned earlier in 1967. It was controlled by Gulbuddin Hekmatyar during the Soviet war in Afghanistan and its power station was at times used to as a tool by depriving Kabul of power. The power station fell into disrepair and by the 2001 Invasion of Afghanistan, the first of the two became operational in September 2010 and the transformers were replaced by early 2012. The rehabilitation is being funded by the World Bank, the second unit should be operational by the end of 2012. In November 2011 another World Bank funded contract was awarded to upgrade components of the power station. List of dams and reservoirs in Afghanistan Media related to Naghlu Dam at Wikimedia Commons
15.
Band-e Amir
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Band-e Amir National Park is Afghanistans first national park, located in the Bamyan Province. It is a series of six deep blue lakes separated by natural dams made of travertine, the lakes are situated in the Hindu Kush mountains of central Afghanistan at approximately 3000 m of elevation, west of the famous Buddhas of Bamiyan. Band-e Amir is one of the few natural lakes in the world which are created by travertine systems. The site of Band-e Amir has been described as Afghanistans Grand Canyon, the river is part of the system of the Balkh River. The name Band-e Amir literally means Commanders Dam which is believed by some to be a reference to Ali, the area is dominated by ethnic Hazaras, who make up around 8-15% of Afghanistans population and the most of them are followers of Shia Islam. Band-e Amir was to become Afghanistans first national park in the 1960s but this was delayed due to political crises, parts of the 1975 Bollywood film Dharmatma, with Feroz Khan and Hema Malini, were filmed at the Band-e Amir National Park. In 2004, Band-e Amir was submitted for recognition as a World Heritage site, in 2009, Band-e Amir was finally declared Afghanistans first national park. As of 2013, about 6,000 local tourists visit the Band-e Amir National Park every year, the area is protected by a small number of park rangers. Band-e Amir is situated at approximately 75 km to the north-west of the ancient city of Bamyan, together with Bamiyan Vally, they are the heart of Afghanistans tourism, attracting thousands of tourists every year and from every corner of the world. The white travertine dams created by lines, which are prevalent in the Band-e Amir Valley. The local people in Band-e-Amir National Park rely heavily on natural resources for the livelihood. Grazing of livestock, shrubs collection for fuel and winter fodder, benefit from ecotourism is expected to be an alternative to decrease dependency on park natural resources. Band-e-Amir receive tourism only in months when the weather is warm. The problem is that local people remains poor and there is limited courage of outsiders to invest in this growing industry, list of dams and reservoirs in Afghanistan Natural areas of Afghanistan Dupree, Nancy Hatch, An Historical Guide to Afghanistan. Band-e Amir National Park travel guide from Wikivoyage
16.
Qargha Reservoir
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Qargha is a dam and reservoir in Afghanistan near Kabul. The reservoir and its peripheral areas provide for recreation such as boating, surfing, golfing. There is a development in the reservoir supported by a hatchery on its banks. Irrigation and hydropower developments have also planned from the stored waters of the reservoir. The dam is about 15 kilometres west of Kabul and is built on the Paghman River, the dam was built in 1933. It has a height of 30 metres, the dam length is 450 metres and top width is 8 metres. A sluice gate of the dam which was damaged has since been restored, the reservoir water spread area behind the dam is 5,000 hectares. The reservoir was developed for the purpose of recreation in the 1950s when Daud was the President of the country and it is now a popular picnic location, particularly on Fridays when it is visited by a large number of picnickers. During the Seventh Fiver Plan of the country, the water from the dam was planned for supplementing drinking water to Kabul city. An irrigation canal is proposed to be built from the dam and this canal is proposed for providing irrigation and expand horticulture. The reservoir has developed for trout fishing with a hatchery set up close to the reservoir. As part of recreation, apart from the lake side upscale Spojhmai hotel and this project is funded by the United Nations Food and Agriculture Organization. As part of planning for alternate sources of energy, utilization of the stored waters of the reservoir. There was a terrorist attack by the Taliban at the hotel on the edge of the reservoir on 22 June 2012, as it was suspected that it was one of the centres of prostitution. Twenty people including security personnel and the terrorists were killed in the encounter, the reservoir feeds a fish hatchery and stocks the rainbow trout fingerlings. The hatchery was set up in 1967 close to the dam, the hatchery was established in the 1970s when 30,000 trout fingerlings were produced and then stocked in the Qargha Reservoir and in many other rivers such as Panjsher, Bamian, Salang and Sarde. The objective of stocking in the reservoir was meant as a fishing activity under licensed sport fishing. Under UNDP/FAO assistance the hatchery was rehabilitated in 1987, and during 1988-89 egg incubators were repaired, eggs were imported from Denmark in 1988
17.
Semiarid
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A semi-arid climate or steppe climate is the climate of a region that receives precipitation below potential evapotranspiration, but not extremely. There are different kinds of climates, depending on such variables as temperature. Semi-arid climates tend to short or scrubby vegetation, with semi-arid areas usually dominated by either grasses or shrubs. To determine if a location has a climate, the precipitation threshold must first be determined. If the areas precipitation is less than the threshold but more than half the threshold. Hot semi-arid climates tend to be located in the tropics and subtropics and these climates tend to have hot, sometimes extremely hot, summers and warm to cool winters, with some to minimal precipitation. Hot semi-arid climates are most commonly found around the fringes of subtropical deserts, hot semi-arid climates are most commonly found in Africa, Australia and South Asia. In Australia, a portion of the Outback surrounding the central desert regions lies within the hot semi-arid climate regime. Hot semi-arid climates can also be found in North America, primarily in Mexico, areas of Texas near Mexico, cold semi-arid climates tend to be located in temperate zones or elevated portions in subtropical zones. They are typically found in continental interiors some distance from bodies of water. Cold semi-arid climates usually feature warm and dry summers, though their summers are not quite as hot as those of hot semi-arid climates. Unlike hot semi-arid climates, areas with cold semi-arid climates tend to have cold winters and these areas usually see some snowfall during the winter, though snowfall is much lower than at locations at similar latitudes with more humid climates. These large diurnal temperature variations are seen in hot semi-arid climates. Cold semi-arid climates are most commonly found in Asia and North America, however, they can also be found in Northern Africa, South Africa, Europe, sections of South America and sections of interior southern Australia and New Zealand. As a result of this, some areas can have climates that are classified as hot or cold depending on the isotherm used. One such location is San Diego, California, which has cool summers for the due to prevailing winds off the ocean. Arid Forest Research Institute Continental climate Dust Bowl Goyders Line Pallisers Triangle Köppen climate classification Wave height Ustic
18.
Gas
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Gas is one of the four fundamental states of matter. A pure gas may be made up of atoms, elemental molecules made from one type of atom. A gas mixture would contain a variety of pure gases much like the air, what distinguishes a gas from liquids and solids is the vast separation of the individual gas particles. This separation usually makes a colorless gas invisible to the human observer, the interaction of gas particles in the presence of electric and gravitational fields are considered negligible as indicated by the constant velocity vectors in the image. One type of commonly known gas is steam, the gaseous state of matter is found between the liquid and plasma states, the latter of which provides the upper temperature boundary for gases. Bounding the lower end of the temperature scale lie degenerative quantum gases which are gaining increasing attention, high-density atomic gases super cooled to incredibly low temperatures are classified by their statistical behavior as either a Bose gas or a Fermi gas. For a comprehensive listing of these states of matter see list of states of matter. The only chemical elements which are stable multi atom homonuclear molecules at temperature and pressure, are hydrogen, nitrogen and oxygen. These gases, when grouped together with the noble gases. Alternatively they are known as molecular gases to distinguish them from molecules that are also chemical compounds. The word gas is a neologism first used by the early 17th-century Flemish chemist J. B. van Helmont, according to Paracelsuss terminology, chaos meant something like ultra-rarefied water. An alternative story is that Van Helmonts word is corrupted from gahst and these four characteristics were repeatedly observed by scientists such as Robert Boyle, Jacques Charles, John Dalton, Joseph Gay-Lussac and Amedeo Avogadro for a variety of gases in various settings. Their detailed studies ultimately led to a relationship among these properties expressed by the ideal gas law. Gas particles are separated from one another, and consequently have weaker intermolecular bonds than liquids or solids. These intermolecular forces result from interactions between gas particles. Like-charged areas of different gas particles repel, while oppositely charged regions of different gas particles attract one another, transient, randomly induced charges exist across non-polar covalent bonds of molecules and electrostatic interactions caused by them are referred to as Van der Waals forces. The interaction of these forces varies within a substance which determines many of the physical properties unique to each gas. A comparison of boiling points for compounds formed by ionic and covalent bonds leads us to this conclusion, the drifting smoke particles in the image provides some insight into low pressure gas behavior
19.
Petroleum
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Petroleum is a naturally occurring, yellow-to-black liquid found in geological formations beneath the Earths surface, which is commonly refined into various types of fuels. Components of petroleum are separated using a technique called fractional distillation and it consists of hydrocarbons of various molecular weights and other organic compounds. The name petroleum covers both naturally occurring unprocessed crude oil and petroleum products that are made up of refined crude oil. A fossil fuel, petroleum is formed when large quantities of dead organisms, usually zooplankton and algae, are buried underneath sedimentary rock, Petroleum has mostly been recovered by oil drilling. Drilling is carried out studies of structural geology, sedimentary basin analysis. Petroleum is used in manufacturing a variety of materials. Concern over the depletion of the earths finite reserves of oil, the burning of fossil fuels plays the major role in the current episode of global warming. The word petroleum comes from Greek, πέτρα for rocks and Greek, the term was found in 10th-century Old English sources. It was used in the treatise De Natura Fossilium, published in 1546 by the German mineralogist Georg Bauer, Petroleum, in one form or another, has been used since ancient times, and is now important across society, including in economy, politics and technology. Great quantities of it were found on the banks of the river Issus, ancient Persian tablets indicate the medicinal and lighting uses of petroleum in the upper levels of their society. By 347 AD, oil was produced from bamboo-drilled wells in China, early British explorers to Myanmar documented a flourishing oil extraction industry based in Yenangyaung that, in 1795, had hundreds of hand-dug wells under production. The mythological origins of the oil fields at Yenangyaung, and its hereditary monopoly control by 24 families, Pechelbronn is said to be the first European site where petroleum has been explored and used. The still active Erdpechquelle, a spring where petroleum appears mixed with water has been used since 1498, Oil sands have been mined since the 18th century. In Wietze in lower Saxony, natural asphalt/bitumen has been explored since the 18th century, both in Pechelbronn as in Wietze, the coal industry dominated the petroleum technologies. In 1848 Young set up a small business refining the crude oil, Young eventually succeeded, by distilling cannel coal at a low heat, in creating a fluid resembling petroleum, which when treated in the same way as the seep oil gave similar products. The production of oils and solid paraffin wax from coal formed the subject of his patent dated 17 October 1850. In 1850 Young & Meldrum and Edward William Binney entered into partnership under the title of E. W. Binney & Co. at Bathgate in West Lothian, the worlds first oil refinery was built in 1856 by Ignacy Łukasiewicz. The demand for petroleum as a fuel for lighting in North America, edwin Drakes 1859 well near Titusville, Pennsylvania, is popularly considered the first modern well
20.
Coal
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Coal is a combustible black or brownish-black sedimentary rock usually occurring in rock strata in layers or veins called coal beds or coal seams. The harder forms, such as coal, can be regarded as metamorphic rock because of later exposure to elevated temperature and pressure. Coal is composed primarily of carbon, along with quantities of other elements, chiefly hydrogen, sulfur, oxygen. A fossil fuel, coal forms when plant matter is converted into peat, which in turn is converted into lignite, then sub-bituminous coal, after that bituminous coal. This involves biological and geological processes that take place over time, throughout history, coal has been used as an energy resource, primarily burned for the production of electricity and heat, and is also used for industrial purposes, such as refining metals. Coal is the largest source of energy for the generation of electricity worldwide, the extraction of coal, its use in energy production and its byproducts are all associated with environmental and health effects including climate change. Coal is extracted from the ground by coal mining, since 1983, the worlds top coal producer has been China. In 2015 China produced 3,747 million tonnes of coal –47. 7% of 7,861 million tonnes world coal production, in 2015 other large producers were United States, India, European Union and Australia. The word originally took the col in Old English, from Proto-Germanic *kula. In Old Turkic languages, kül is ash, cinders, öčür is quench, the compound charcoal in Turkic is öčür kül, literally quenched ashes, cinders, coals with elided anlaut ö- and inflection affixes -ülmüş. At various times in the geologic past, the Earth had dense forests in low-lying wetland areas, due to natural processes such as flooding, these forests were buried underneath soil. As more and more soil deposited over them, they were compressed, the temperature also rose as they sank deeper and deeper. As the process continued the plant matter was protected from biodegradation and oxidation and this trapped the carbon in immense peat bogs that were eventually covered and deeply buried by sediments. Under high pressure and high temperature, dead vegetation was slowly converted to coal, as coal contains mainly carbon, the conversion of dead vegetation into coal is called carbonization. The wide, shallow seas of the Carboniferous Period provided ideal conditions for coal formation, the exception is the coal gap in the Permian–Triassic extinction event, where coal is rare. Coal is known from Precambrian strata, which predate land plants — this coal is presumed to have originated from residues of algae, in its dehydrated form, peat is a highly effective absorbent for fuel and oil spills on land and water. It is also used as a conditioner for soil to make it able to retain. Lignite, or brown coal, is the lowest rank of coal, jet, a compact form of lignite, is sometimes polished and has been used as an ornamental stone since the Upper Palaeolithic
21.
Copper
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Copper is a chemical element with symbol Cu and atomic number 29. It is a soft, malleable, and ductile metal with high thermal and electrical conductivity. A freshly exposed surface of copper has a reddish-orange color. Copper is one of the few metals that occur in nature in directly usable metallic form as opposed to needing extraction from an ore and this led to very early human use, from c.8000 BC. Copper used in buildings, usually for roofing, oxidizes to form a green verdigris, Copper is sometimes used in decorative art, both in its elemental metal form and in compounds as pigments. Copper compounds are used as agents, fungicides, and wood preservatives. Copper is essential to all living organisms as a trace dietary mineral because it is a key constituent of the enzyme complex cytochrome c oxidase. In molluscs and crustaceans, copper is a constituent of the blood pigment hemocyanin, replaced by the hemoglobin in fish. In humans, copper is found mainly in the liver, muscle, the adult body contains between 1.4 and 2.1 mg of copper per kilogram of body weight. The filled d-shells in these elements contribute little to interatomic interactions, unlike metals with incomplete d-shells, metallic bonds in copper are lacking a covalent character and are relatively weak. This observation explains the low hardness and high ductility of single crystals of copper, at the macroscopic scale, introduction of extended defects to the crystal lattice, such as grain boundaries, hinders flow of the material under applied stress, thereby increasing its hardness. For this reason, copper is supplied in a fine-grained polycrystalline form. The softness of copper partly explains its high conductivity and high thermal conductivity. The maximum permissible current density of copper in open air is approximately 3. 1×106 A/m2 of cross-sectional area, Copper is one of a few metallic elements with a natural color other than gray or silver. Pure copper is orange-red and acquires a reddish tarnish when exposed to air, as with other metals, if copper is put in contact with another metal, galvanic corrosion will occur. A green layer of verdigris can often be seen on old structures, such as the roofing of many older buildings. Copper tarnishes when exposed to sulfur compounds, with which it reacts to form various copper sulfides. There are 29 isotopes of copper, 63Cu and 65Cu are stable, with 63Cu comprising approximately 69% of naturally occurring copper, both have a spin of 3⁄2
22.
Chromite
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Chromite is an iron chromium oxide, FeCr2O4. It is a mineral belonging to the spinel group. Magnesium can substitute for iron in variable amounts as it forms a solution with magnesiochromite. It is by far the most industrially important mineral for the production of chromium, used as an alloying ingredient in stainless. Chromite is found as orthocumulate lenses of chromitite in peridotite from the Earths mantle and it also occurs in layered ultramafic intrusive rocks. In addition, it is found in rocks such as some serpentinites. Ore deposits of chromite form as early magmatic differentiates and it is commonly associated with olivine, magnetite, serpentine, and corundum. The vast Bushveld igneous complex of South Africa is a layered mafic to ultramafic igneous body with some layers consisting of 90% chromite making the rare rock type. The Stillwater igneous complex in Montana also contains significant chromite, the only ores of chromium are the minerals chromite and magnesiochromite. Most of the time, economic geology names chromite the whole chromite-magnesiochromite series, the two main products of chromite refining are ferrochromium and metallic chromium, for those products the ore smelter process differs considerably. Chromite is also used as a material, because it has a high heat stability. The chromium extracted from chromite is used in plating and alloying for production of corrosion resistant superalloys, nichrome. Chromium is used as a pigment for glass, glazes, and paint and it is also sometimes used as a gemstone. In 200214,600,000 metric tons of chromite were mined, the largest producers were South Africa, India, Kazakhstan, Zimbabwe, Finland, Iran, and Brazil with several other countries producing the rest of less than 10% of the world production. Afghanistan has significant deposits of high grade ore, which is mined illegally in Khost Province. In Pakistan, chromite is mined from the rocks in mainly the Muslimbagh killa Saifullah District. Most of the chromite is of metallurgical grade with Cr2O3 averaging 54%, recently, the biggest user of chromite ore has been China, importing large quantities from South Africa, Pakistan, and other countries. The concentrate is used to make ferrochrome, which is in used to make stainless steel
23.
Barite
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Baryte or barite is a mineral consisting of barium sulfate. The baryte group consists of baryte, celestine, anglesite and anhydrite, baryte is generally white or colorless, and is the main source of barium. Baryte and celestine form a solid solution SO4, the radiating form, sometimes referred to as Bologna Stone, attained some notoriety among alchemists for the phosphorescent specimens found in the 17th century near Bologna by Vincenzo Casciarolo. In practice, however, this is usually the mineral baryte, most crude baryte requires some upgrading to minimum purity or density. Baryte that is used as an aggregate in a heavy cement is crushed and screened to a uniform size, the name baryte is derived from the Greek word βαρύς. Other names have been used for baryte, including barytine, barytite, schwerspath, Heavy Spar, tiff, baryte occurs in a large number of depositional environments, and is deposited through a large number of processes including biogenic, hydrothermal, and evaporation, among others. Baryte commonly occurs in veins in limestones, in hot spring deposits. It is often associated with the minerals anglesite and celestine and it has also been identified in meteorites. It is mined in Arkansas, Connecticut, Virginia, North Carolina, Georgia, Tennessee, Kentucky, Nevada, world baryte production for 2014 was 9.7 million tonnes. The major baryte producers are as follows, China, India, Morocco, United States, Mexico, Iran, Turkey and Kazakhstan. The main users of baryte in 2014 were US, China, Gulf States, 77% of baryte worldwide is used as a weighting agent for drilling fluids in oil and gas exploration to suppress high formation pressures and prevent blowouts. As a well is drilled, the bit passes through various formations, the deeper the hole, the more baryte is needed as a percentage of the total mud mix. Baryte used for drilling petroleum wells can be black, blue, brown or gray depending on the ore body. The baryte is finely ground so that at least 97% of the material, by weight, can pass through a 200-mesh screen, in August 2010 API published specifications to modify the 4.2 drilling grade standards for baryte to include 4.1 SG materials. It is also used to other barium chemicals, notably barium carbonate which is used for the manufacture of LED glass for television and computer screens. Historically baryte was used for the production of barium hydroxide for sugar refining, and as a pigment for textiles, paper. Although baryte contains a metal, it is not a toxic chemical because of its extreme insolubility. It is also used as gemstone
24.
Sulfur
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Sulfur or sulphur is a chemical element with symbol S and atomic number 16. It is abundant, multivalent, and nonmetallic, under normal conditions, sulfur atoms form cyclic octatomic molecules with chemical formula S8. Elemental sulfur is a yellow crystalline solid at room temperature. Chemically, sulfur reacts with all elements except for gold, platinum, iridium, tellurium, though sometimes found in pure, native form, sulfur usually occurs as sulfide and sulfate minerals. Being abundant in native form, sulfur was known in ancient times, being mentioned for its uses in ancient India, ancient Greece, China, in the Bible, sulfur is called brimstone. Today, almost all elemental sulfur is produced as a byproduct of removing sulfur-containing contaminants from natural gas, the greatest commercial use of the element is the production of sulfuric acid for sulfate and phosphate fertilizers, and other chemical processes. The element sulfur is used in matches, insecticides, and fungicides, many sulfur compounds are odoriferous, and the smells of odorized natural gas, skunk scent, grapefruit, and garlic are due to organosulfur compounds. Hydrogen sulfide gives the characteristic odor to rotting eggs and other biological processes, sulfur is an essential element for all life, but almost always in the form of organosulfur compounds or metal sulfides. Three amino acids and two vitamins are organosulfur compounds, many cofactors also contain sulfur including glutathione and thioredoxin and iron–sulfur proteins. Disulfides, S–S bonds, confer mechanical strength and insolubility of the keratin, found in outer skin, hair. Sulfur is one of the chemical elements needed for biochemical functioning and is an elemental macronutrient for all organisms. Sulfur is derived from the Latin word sulpur, which was Hellenized to sulphur, the spelling sulfur appears toward the end of the Classical period. In 12th-century Anglo-French, it was sulfre, in the 14th century the Latin ph was restored, for sulphre, the parallel f~ph spellings continued in Britain until the 19th century, when the word was standardized as sulphur. Sulfur was the form chosen in the United States, whereas Canada uses both, the IUPAC adopted the spelling sulfur in 1990, as did the Nomenclature Committee of the Royal Society of Chemistry in 1992, restoring the spelling sulfur to Britain. Sulfur forms polyatomic molecules with different chemical formulas, the best-known allotrope being octasulfur, cyclo-S8. The point group of cyclo-S8 is D4d and its dipole moment is 0 D. Octasulfur is a soft, bright-yellow solid that is odorless and it melts at 115.21 °C, boils at 444.6 °C and sublimes easily. At 95.2 °C, below its melting temperature, cyclo-octasulfur changes from α-octasulfur to the β-polymorph, the structure of the S8 ring is virtually unchanged by this phase change, which affects the intermolecular interactions. At higher temperatures, the viscosity decreases as depolymerization occurs, molten sulfur assumes a dark red color above 200 °C
25.
Lead
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Lead is a chemical element with atomic number 82 and symbol Pb. When freshly cut, it is bluish-white, it tarnishes to a dull gray upon exposure to air and it is a soft, malleable, and heavy metal with a density exceeding that of most common materials. Lead has the second-highest atomic number of the stable elements. Lead is a relatively unreactive post-transition metal and its weak metallic character is illustrated by its amphoteric nature and tendency to form covalent bonds. Compounds of lead are found in the +2 oxidation state. Exceptions are mostly limited to organolead compounds, like the lighter members of the group, lead exhibits a tendency to bond to itself, it can form chains, rings, and polyhedral structures. Lead is easily extracted from its ores and was known to people in Western Asia. A principal ore of lead, galena, often bears silver, Lead production declined after the fall of Rome and did not reach comparable levels again until the Industrial Revolution. Nowadays, global production of lead is about ten million tonnes annually, Lead has several properties that make it useful, high density, low melting point, ductility, and relative inertness to oxidation. In the late 19th century, lead was recognized as poisonous, Lead is a neurotoxin that accumulates in soft tissues and bones, damaging the nervous system and causing brain disorders and, in mammals, blood disorders. A lead atom has 82 electrons, arranged in a configuration of 4f145d106s26p2. The combined first and second ionization energies—the total energy required to remove the two 6p electrons—is close to that of tin, leads upper neighbor in group 14. This is unusual since ionization energies generally fall going down a group as an elements outer electrons become more distant from the nucleus, the similarity is caused by the lanthanide contraction—the decrease in element radii from lanthanum to lutetium, and the relatively small radii of the elements after hafnium. The contraction is due to shielding of the nucleus by the lanthanide 4f electrons. The combined first four ionization energies of lead exceed those of tin, for this reason lead, unlike tin, mostly forms compounds in which it has an oxidation state of +2, rather than +4. Relativistic effects, which become particularly prominent at the bottom of the periodic table, as a result, the 6s electrons of lead become reluctant to participate in bonding, a phenomenon called the inert pair effect. A related outcome is that the distance between nearest atoms in crystalline lead is unusually long, the lighter group 14 elements form stable or metastable allotropes having the tetrahedrally coordinated and covalently bonded diamond cubic structure. The energy levels of their outer s- and p-orbitals are close enough to allow mixing into four hybrid sp3 orbitals
26.
Zinc
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Zinc is a chemical element with the symbol Zn and atomic number 30. It is the first element in group 12 of the periodic table, in some respects zinc is chemically similar to magnesium, both elements exhibit only one normal oxidation state, and the Zn2+ and Mg2+ ions are of similar size. Zinc is the 24th most abundant element in Earths crust and has five stable isotopes, the most common zinc ore is sphalerite, a zinc sulfide mineral. The largest workable lodes are in Australia, Asia, and the United States, Zinc is refined by froth flotation of the ore, roasting, and final extraction using electricity. Zinc metal was not produced on a large scale until the 12th century in India and was unknown to Europe until the end of the 16th century, the mines of Rajasthan have given definite evidence of zinc production going back to the 6th century BC. To date, the oldest evidence of pure zinc comes from Zawar, in Rajasthan, alchemists burned zinc in air to form what they called philosophers wool or white snow. The element was named by the alchemist Paracelsus after the German word Zinke. German chemist Andreas Sigismund Marggraf is credited with discovering pure metallic zinc in 1746, work by Luigi Galvani and Alessandro Volta uncovered the electrochemical properties of zinc by 1800. Corrosion-resistant zinc plating of iron is the application for zinc. Other applications are in batteries, small non-structural castings. A variety of compounds are commonly used, such as zinc carbonate and zinc gluconate, zinc chloride, zinc pyrithione, zinc sulfide. Zinc is an essential mineral perceived by the public today as being of exceptional biologic and public health importance, Zinc deficiency affects about two billion people in the developing world and is associated with many diseases. In children, deficiency causes growth retardation, delayed sexual maturation, infection susceptibility, enzymes with a zinc atom in the reactive center are widespread in biochemistry, such as alcohol dehydrogenase in humans. Consumption of excess zinc can cause ataxia, lethargy and copper deficiency, Zinc is a bluish-white, lustrous, diamagnetic metal, though most common commercial grades of the metal have a dull finish.6 pm. The metal is hard and brittle at most temperatures but becomes malleable between 100 and 150 °C, above 210 °C, the metal becomes brittle again and can be pulverized by beating. Zinc is a conductor of electricity. For a metal, zinc has relatively low melting and boiling points, the melting point is the lowest of all the transition metals aside from mercury and cadmium. Many alloys contain zinc, including brass, Other metals long known to form binary alloys with zinc are aluminium, antimony, bismuth, gold, iron, lead, mercury, silver, tin, magnesium, cobalt, nickel, tellurium, and sodium
27.
Iron ore
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Iron ores are rocks and minerals from which metallic iron can be economically extracted. The ores are rich in iron oxides and vary in color from dark grey, bright yellow. The iron itself is found in the form of magnetite, hematite, goethite, limonite or siderite. Ores containing very high quantities of hematite or magnetite are known as ore or direct shipping ore. Iron ore is the raw material used to make pig iron, indeed, it has been argued that iron ore is more integral to the global economy than any other commodity, except perhaps oil. Metallic iron is virtually unknown on the surface of the Earth except as iron-nickel alloys from meteorites, although iron is the fourth most abundant element in the Earths crust, comprising about 5%, the vast majority is bound in silicate or more rarely carbonate minerals. Prior to the revolution, most iron was obtained from widely available goethite or bog ore, for example during the American Revolution. Prehistoric societies used laterite as a source of iron ore, historically, much of the iron ore utilized by industrialized societies has been mined from predominantly hematite deposits with grades of around 70% Fe. These deposits are referred to as direct shipping ores or natural ores. Iron-ore mining methods vary by the type of ore being mined, there are four main types of iron-ore deposits worked currently, depending on the mineralogy and geology of the ore deposits. These are magnetite, titanomagnetite, massive hematite and pisolitic ironstone deposits, banded iron formations are sedimentary rocks containing more than 15% iron composed predominantly of thinly bedded iron minerals and silica. Banded iron formations occur exclusively in Precambrian rocks, and are weakly to intensely metamorphosed. Banded iron formations may contain iron in carbonates or silicates, banded iron formations are known as taconite within North America. The mining involves moving tremendous amounts of ore and waste, the waste comes in two forms, non-ore bedrock in the mine, and unwanted minerals which are an intrinsic part of the ore rock itself. The mullock is mined and piled in dumps, and the gangue is separated during the beneficiation process and is removed as tailings. Taconite tailings are mostly the mineral quartz, which is chemically inert and this material is stored in large, regulated water settling ponds. The typical magnetite iron-ore concentrate has less than 0. 1% phosphorus, 3–7% silica, currently magnetite iron ore is mined in Minnesota and Michigan in the U. S. Direct-shipping iron-ore deposits are exploited on all continents except Antarctica, with the largest intensity in South America
28.
Salt
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Salt is present in vast quantities in seawater, where it is the main mineral constituent. The open ocean has about 35 grams of solids per litre, Salt is essential for life in general, and saltiness is one of the basic human tastes. The tissues of animals contain larger quantities of salt than do plant tissues, Salt is one of the oldest and most ubiquitous food seasonings, and salting is an important method of food preservation. Salt was also prized by the ancient Hebrews, the Greeks, the Romans, the Byzantines, the Hittites, Egyptians, and the Indians. Salt became an important article of trade and was transported by boat across the Mediterranean Sea, along specially built salt roads, the scarcity and universal need for salt has led nations to go to war over it and use it to raise tax revenues. Salt is used in ceremonies and has other cultural significance. Salt is processed from salt mines, or by the evaporation of seawater or mineral-rich spring water in shallow pools. Its major industrial products are caustic soda and chlorine, and is used in industrial processes including the manufacture of polyvinyl chloride, plastics, paper pulp. Of the annual production of around two hundred million tonnes of salt, only about 6% is used for human consumption. Other uses include water conditioning processes, de-icing highways, and agricultural use, edible salt is sold in forms such as sea salt and table salt which usually contains an anti-caking agent and may be iodised to prevent iodine deficiency. As well as its use in cooking and at the table, sodium is an essential nutrient for human health via its role as an electrolyte and osmotic solute. Excessive salt consumption can increase the risk of diseases, such as hypertension, in children. Such health effects of salt have long been studied, accordingly, numerous world health associations and experts in developed countries recommend reducing consumption of popular salty foods. The World Health Organization recommends that adults should consume less than 2,000 mg of sodium, humans have always tended to build communities either around sources of salt, or where they can trade for it. All through history the availability of salt has been pivotal to civilization, the word salary comes from the Latin word for salt because the Roman Legions were sometimes paid in salt. The Natron Valley was a key region that supported the Egyptian Empire to its north, because it supplied it with a kind of salt that came to be called by its name, natron. Even before this, what is now thought to have been the first city in Europe is Solnitsata, in Bulgaria, even the name Solnisata means salt works. A very ancient salt-works operation has been discovered at the Poiana Slatinei archaeological site next to a spring in Lunca, Neamț County
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Precious stone
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A gemstone is a piece of mineral crystal which, in cut and polished form, is used to make jewelry or other adornments. However, certain rocks or organic materials that are not minerals are used for jewelry and are therefore often considered to be gemstones as well. Most gemstones are hard, but some soft minerals are used in jewelry because of their luster or other properties that have aesthetic value. Rarity is another characteristic that lends value to a gemstone, apart from jewelry, from earliest antiquity engraved gems and hardstone carvings, such as cups, were major luxury art forms. A gem maker is called a lapidary or gemcutter, a worker is a diamantaire. The carvings of Carl Fabergé are significant works in this tradition, the traditional classification in the West, which goes back to the ancient Greeks, begins with a distinction between precious and semi-precious, similar distinctions are made in other cultures. In modern usage the precious stones are diamond, ruby, sapphire, other stones are classified by their color, translucency and hardness. Another unscientific term for semi-precious gemstones used in art history and archaeology is hardstone, in modern times gemstones are identified by gemologists, who describe gems and their characteristics using technical terminology specific to the field of gemology. The first characteristic a gemologist uses to identify a gemstone is its chemical composition, for example, diamonds are made of carbon and rubies of aluminium oxide. Next, many gems are crystals which are classified by their crystal system such as cubic or trigonal or monoclinic, another term used is habit, the form the gem is usually found in. For example, diamonds, which have a crystal system, are often found as octahedrons. Gemstones are classified into different groups, species, and varieties, for example, ruby is the red variety of the species corundum, while any other color of corundum is considered sapphire. Other examples are the Emerald, aquamarine, red beryl, goshenite, heliodor, and morganite, gems are characterized in terms of refractive index, dispersion, specific gravity, hardness, cleavage, fracture, and luster. They may exhibit pleochroism or double refraction and they may have luminescence and a distinctive absorption spectrum. Material or flaws within a stone may be present as inclusions, gemstones may also be classified in terms of their water. This is a grading of the gems luster, transparency. Very transparent gems are considered first water, while second or third water gems are those of a lesser transparency, there is no universally accepted grading system for gemstones. Diamonds are graded using a system developed by the Gemological Institute of America in the early 1950s, historically, all gemstones were graded using the naked eye
30.
Semiprecious stone
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A gemstone is a piece of mineral crystal which, in cut and polished form, is used to make jewelry or other adornments. However, certain rocks or organic materials that are not minerals are used for jewelry and are therefore often considered to be gemstones as well. Most gemstones are hard, but some soft minerals are used in jewelry because of their luster or other properties that have aesthetic value. Rarity is another characteristic that lends value to a gemstone, apart from jewelry, from earliest antiquity engraved gems and hardstone carvings, such as cups, were major luxury art forms. A gem maker is called a lapidary or gemcutter, a worker is a diamantaire. The carvings of Carl Fabergé are significant works in this tradition, the traditional classification in the West, which goes back to the ancient Greeks, begins with a distinction between precious and semi-precious, similar distinctions are made in other cultures. In modern usage the precious stones are diamond, ruby, sapphire, other stones are classified by their color, translucency and hardness. Another unscientific term for semi-precious gemstones used in art history and archaeology is hardstone, in modern times gemstones are identified by gemologists, who describe gems and their characteristics using technical terminology specific to the field of gemology. The first characteristic a gemologist uses to identify a gemstone is its chemical composition, for example, diamonds are made of carbon and rubies of aluminium oxide. Next, many gems are crystals which are classified by their crystal system such as cubic or trigonal or monoclinic, another term used is habit, the form the gem is usually found in. For example, diamonds, which have a crystal system, are often found as octahedrons. Gemstones are classified into different groups, species, and varieties, for example, ruby is the red variety of the species corundum, while any other color of corundum is considered sapphire. Other examples are the Emerald, aquamarine, red beryl, goshenite, heliodor, and morganite, gems are characterized in terms of refractive index, dispersion, specific gravity, hardness, cleavage, fracture, and luster. They may exhibit pleochroism or double refraction and they may have luminescence and a distinctive absorption spectrum. Material or flaws within a stone may be present as inclusions, gemstones may also be classified in terms of their water. This is a grading of the gems luster, transparency. Very transparent gems are considered first water, while second or third water gems are those of a lesser transparency, there is no universally accepted grading system for gemstones. Diamonds are graded using a system developed by the Gemological Institute of America in the early 1950s, historically, all gemstones were graded using the naked eye
31.
Fresh water
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Fresh water is generally characterized by having low concentrations of dissolved salts and other total dissolved solids. The term specifically excludes seawater and brackish water although it does include mineral-rich waters such as chalybeate springs, the term sweet water has been used to describe fresh water in contrast to salt water. The term fresh water does not have the meaning as potable water. Much of the fresh water and ground water is unsuitable for drinking without some form of purification because of the presence of chemical or biological contaminants. It may also be in contact with the underlying underground water. The majority of water on Earth is in ice caps. The source of almost all water is precipitation from the atmosphere, in the form of mist, rain. Fresh water falling as mist, rain or snow contains materials dissolved from the atmosphere and material from the sea, in some cases this acid rain results in pollution of lakes and rivers. In coastal areas fresh water may contain significant concentrations of salts derived from the sea if windy conditions have lifted drops of seawater into the rain-bearing clouds. This can give rise to elevated concentrations of sodium, chloride, magnesium, significant quantities of iron may be transported in this way including the well-documented transfer of iron-rich rainfall falling in Brazil derived from sand-storms in the Sahara in north Africa. Water is an issue for the survival of all living organisms. Some can use water but many organisms including the great majority of higher plants. Out of all the water on Earth, saline water in oceans, seas and saline groundwater make up about 97% of it. Freshwater lakes contain about 87% of this surface water, including 29% in the African Great Lakes, 20% in Lake Baikal in Russia, 21% in the North American Great Lakes. Swamps have most of the balance only a small amount in rivers. In areas with no water on the ground surface, fresh water derived from precipitation may, because of its lower density. Most of the fresh water is frozen in ice sheets. Many areas suffer from lack of distribution of water, such as deserts
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Soil
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Soil is a mixture of minerals, organic matter, gases, liquids, and countless organisms that together support life on Earth. Soil is called the Skin of the Earth and interfaces with the lithosphere, the hydrosphere, the atmosphere, the term pedolith, used commonly to refer to the soil, literally translates ground stone. Soil consists of a phase of minerals and organic matter, as well as a porous phase that holds gases. Accordingly, soils are often treated as a system of solids, liquids. Soil is a product of the influence of climate, relief, organisms, Soil continually undergoes development by way of numerous physical, chemical and biological processes, which include weathering with associated erosion. Given its complexity and strong internal connectedness soil has been considered as an ecosystem by soil ecologists. Most soils have a dry bulk density between 1.1 and 1.6 g/cm3, while the particle density is much higher. Little of the soil of planet Earth is older than the Pleistocene and none is older than the Cenozoic, Soil science has two basic branches of study, edaphology and pedology. Edaphology is concerned with the influence of soils on living things, pedology is focused on the formation, description, and classification of soils in their natural environment. In engineering terms, soil is referred to as regolith, or loose material that lies above the solid geology. Soil is commonly referred to as earth or dirt, technically, as soil resources serve as a basis for food security, the international community advocates its sustainable and responsible use through different types of soil governance. Soil is a component of the Earths ecosystem. The worlds ecosystems are impacted in far-reaching ways by the carried out in the soil, from ozone depletion and global warming, to rainforest destruction. Following the atmosphere, the soil is the next largest carbon reservoir on Earth, as the planet warms, soils will add carbon dioxide to the atmosphere due to its increased biological activity at higher temperatures. Thus, soil carbon losses likely have a positive feedback response to global warming. Since soil has a range of available niches and habitats. A gram of soil can contain billions of organisms, belonging to thousands of species, mostly microbial, Soil has a mean prokaryotic density of roughly 108 organisms per gram, whereas the ocean has no more than 107 procaryotic organisms per milliliter of seawater. Since plant roots need oxygen, ventilation is an important characteristic of soil and this ventilation can be accomplished via networks of interconnected soil pores, which also absorb and hold rainwater making it readily available for plant uptake
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Overgrazing
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Overgrazing occurs when plants are exposed to intensive grazing for extended periods of time, or without sufficient recovery periods. It can be caused by either livestock in poorly managed agricultural applications, game reserves and it can also be caused by immobile, travel restricted populations of native or non-native wild animals. The only thing to stop overgrazing is to limit the space to roam around. Cows are the things that causes overgrazing and overgrazing can lead to desertification. It reduces the usefulness, productivity, and biodiversity of the land and is one cause of desertification and erosion, Overgrazing is also seen as a cause of the spread of invasive species of non-native plants and of weeds. Sustainable grassland production is based on grass and grassland management, land management, animal management, grazing management, with sustainable agriculture and agroecology practices, is the foundation of grassland-based livestock production since it affects both animal and plant health and productivity. In some regions of the United States under continuous grazing, overgrazed pastures are predominated by short-grass species such as bluegrass, in all cases, palatable tall grasses such as orchard grass are sparse or non-existent. Under rotational grazing, overgrazed plants do not have time to recover to the proper height between grazing events. The animals resume grazing before the plants have restored carbohydrate reserves, another indicator of overgrazing in some parts of North America is that livestock run out of pasture, and hay needs to be fed early in the fall. In contrast, most areas of the world do not experience the climatic regime as the continental United States. Overgrazing is also indicated in livestock performance and condition, cows having inadequate pasture immediately following their calfs weaning may have poor body condition the following season. This may reduce the health and vigor of cows and calves at calving, also, cows in poor body condition do not cycle as soon after calving, which can result in delayed breeding. This can result in a long calving season, with good cow genetics, nutrition, ideal seasons and controlled breeding 55% to 75% of the calves should come in the first 21 days of the calving season. Poor weaning weights of calves can be caused by insufficient pasture, when cows give less milk, reduction in soil depth, soil organic matter and soil fertility impair the lands future natural and agricultural productivity. Soil fertility can sometimes be mitigated by applying the appropriate lime, however, the loss of soil depth and organic matter takes centuries to correct. Their loss is critical in determining the soils water-holding capacity and how well pasture plants do during dry weather, native plant grass species, both individual bunch grasses and in grasslands, are especially vulnerable. In the continental United States, to prevent overgrazing, match the forage supplement to the herds requirement and this means that a buffer needs to be in the system to adjust for the fastest growth of forages. Another potential buffer is to plant warm-season perennial grasses such as switchgrass and this reduces the area that the livestock can use early in the season, making it easier for them to keep up with the cool-season grasses
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Deforestation
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Deforestation, clearance or clearing is the removal of a forest or stand of trees where the land is thereafter converted to a non-forest use. Examples of deforestationinclude conversion of forestland to farms, ranches, or urban use, the most concentrated deforestation occurs in tropical rainforests. About 30% of Earths land surface is covered by forests, Deforestation occurs for multiple reasons, trees are cut down to be used for building or sold as fuel, while cleared land is used as pasture for livestock and plantation. The removal of trees without sufficient reforestation has resulted in damage to habitat, biodiversity loss and it has adverse impacts on biosequestration of atmospheric carbon dioxide. Deforestation has also used in war to deprive the enemy of cover for its forces. Modern examples of this were the use of Agent Orange by the British military in Malaya during the Malayan Emergency, as of 2005, net deforestation rates have ceased to increase in countries with a per capita GDP of at least US$4,600. Deforested regions typically incur significant adverse soil erosion and frequently degrade into wasteland, disregard of ascribed value, lax forest management and deficient environmental laws are some of the factors that allow deforestation to occur on a large scale. In many countries, deforestation, both naturally occurring and human-induced, is an ongoing issue, Deforestation causes extinction, changes to climatic conditions, desertification, and displacement of populations as observed by current conditions and in the past through the fossil record. More than half of all plant and land animal species in the live in tropical forests. Between 2000 and 2012,2.3 million square kilometres of forests around the world were cut down, as a result of deforestation, only 6.2 million square kilometres remain of the original 16 million square kilometres of forest that formerly covered the Earth. Experts do not agree on whether industrial logging is an important contributor to global deforestation, some argue that poor people are more likely to clear forest because they have no alternatives, others that the poor lack the ability to pay for the materials and labour needed to clear forest. One study found that population increases due to fertility rates were a primary driver of tropical deforestation in only 8% of cases. Other causes of contemporary deforestation may include corruption of government institutions, the distribution of wealth and power, population growth and overpopulation. Globalization is often viewed as another cause of deforestation, though there are cases in which the impacts of globalization have promoted localized forest recovery. The degradation of forest ecosystems has also traced to economic incentives that make forest conversion appear more profitable than forest conservation. Some commentators have noted a shift in the drivers of deforestation over the past 30 years, Deforestation is ongoing and is shaping climate and geography. Deforestation is a contributor to global warming, and is cited as one of the major causes of the enhanced greenhouse effect. Tropical deforestation is responsible for approximately 20% of world greenhouse gas emissions, according to the Intergovernmental Panel on Climate Change deforestation, mainly in tropical areas, could account for up to one-third of total anthropogenic carbon dioxide emissions
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Desertification
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Desertification is a type of land degradation in which relatively dry area of land becomes increasingly arid, typically losing its bodies of water as well as vegetation and wildlife. It is caused by a variety of factors, such as climate change. Desertification is a significant global ecological and environmental problem, considerable controversy exists over the proper definition of the term desertification for which Helmut Geist has identified more than 100 formal definitions. Another major contribution to the controversy comes from the sub-grouping of types of desertification, the worlds most noted deserts have been formed by natural processes interacting over long intervals of time. During most of times, deserts have grown and shrunk independent of human activities. Paleodeserts are large sand seas now inactive because they are stabilized by vegetation, some extending beyond the present margins of deserts, such as the Sahara. Drylands occupy approximately 40–41% of Earth’s land area and are home to more than 2 billion people. As of 1998, the then-current degree of expansion of the Sahara was not well known, due to a lack of recent. Causes of desertification in Sahel, The impact of global warming, in this area, the level of desertification is very high compared to other areas in the world. All areas situated in the part of Africa are characterized by a dry climate, hot temperatures. So, droughts are the rule in the Sahel region, development of the desertification process in Sahel, Some studies have shown that Africa has lost approximately 650000 km² of its productive agricultural land over the past 50 years. The propagation of desertification in this area is considerable, Some statistics have shown that since 1900, the Sahara has expanded by 250 km, covering an additional area of 6000 square kilometers. Impacts of desertification in Sahel, The survey, done by the institute for development, had demonstrated that this dryness is spreading fast in the Sahelian countries. Desertification in the Sahel can affect more than one billion of its inhabitants, 70% of the arid area has deteriorated and water resources have disappeared, leading to soil degradation. The loss of topsoil means that plants take root firmly. The United Nations Convention says that six million Sahelian citizens would have to give up the desertified zones of sub-Saharan Africa for North Africa. As the desertification takes place, the landscape may progress through different stages, on gradually sloped terrain, desertification can create increasingly larger empty spaces over a large strip of land, a phenomenon known as Brousse tigrée. A mathematical model of this phenomenon proposed by C, klausmeier attributes this patterning to dynamics in plant-water interaction
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Air pollution
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Air pollution occurs when harmful substances including particulates and biological molecules are introduced into Earths atmosphere. It may cause diseases, allergies or death in humans, it may cause harm to other living organisms such as animals and food crops. Human activity and natural processes can both generate air pollution, indoor air pollution and poor urban air quality are listed as two of the worlds worst toxic pollution problems in the 2008 Blacksmith Institute Worlds Worst Polluted Places report. According to the 2014 WHO report, air pollution in 2012 caused the deaths of around 7 million people worldwide, an air pollutant is a substance in the air that can have adverse effects on humans and the ecosystem. The substance can be particles, liquid droplets, or gases. A pollutant can be of natural origin or man-made, pollutants are classified as primary or secondary. Primary pollutants are usually produced from a process, such as ash from a volcanic eruption, other examples include carbon monoxide gas from motor vehicle exhaust, or the sulfur dioxide released from factories. Secondary pollutants are not emitted directly, rather, they form in the air when primary pollutants react or interact. Ground level ozone is a prominent example of a secondary pollutant, some pollutants may be both primary and secondary, they are both emitted directly and formed from other primary pollutants. Substances emitted into the atmosphere by human activity include, Carbon dioxide - Debate continues over whether carbon dioxide should be classified as an atmospheric pollutant, because of its role as a greenhouse gas it has been described as the leading pollutant and the worst climate pollution. Against this it is argued that carbon dioxide is a component of the atmosphere, essential for plant life. This question of terminology has practical effects, for example as determining whether the U. S. Clean Air Act is deemed to regulate CO2 emissions, CO2 increase in earths atmosphere has been accelerating. Sulfur oxides - particularly sulfur dioxide, a compound with the formula SO2. SO2 is produced by volcanoes and in industrial processes. Coal and petroleum often contain sulfur compounds, and their combustion generates sulfur dioxide, further oxidation of SO2, usually in the presence of a catalyst such as NO2, forms H2SO4, and thus acid rain. This is one of the causes for concern over the impact of the use of these fuels as power sources. Nitrogen oxides - Nitrogen oxides, particularly nitrogen dioxide, are expelled from high temperature combustion and they can be seen as a brown haze dome above or a plume downwind of cities. Nitrogen dioxide is a compound with the formula NO2
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Water pollution
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Water pollution is the contamination of water bodies. This form of environmental degradation occurs when pollutants are directly or indirectly discharged into water bodies without adequate treatment to remove harmful compounds, Water pollution affects the entire biosphere – plants and organisms living in these bodies of water. In almost all cases the effect is damaging not only to individual species and population, Water pollution is a major global problem which requires ongoing evaluation and revision of water resource policy at all levels. It has been suggested that pollution is the leading worldwide cause of deaths and diseases. An estimated 580 people in India die of water related illness every day. About 90 percent of the water in the cities of China is polluted, as of 2007, half a billion Chinese had no access to safe drinking water. In addition to the problems of water pollution in developing countries. The head of Chinas national development agency said in 2007 that one quarter the length of Chinas seven main rivers were so poisoned the water harmed the skin. Natural phenomena such as volcanoes, algae blooms, storms, and earthquakes also cause changes in water quality. Although interrelated, surface water and groundwater have often studied and managed as separate resources. Surface water seeps through the soil and becomes groundwater, conversely, groundwater can also feed surface water sources. Sources of surface water pollution are generally grouped into two based on their origin. Point source water pollution refers to contaminants that enter a waterway from a single, identifiable source, examples of sources in this category include discharges from a sewage treatment plant, a factory, or a city storm drain. The U. S. Clean Water Act defines point source for regulatory enforcement purposes, the CWA definition of point source was amended in 1987 to include municipal storm sewer systems, as well as industrial storm water, such as from construction sites. Nonpoint source pollution refers to contamination that does not originate from a single discrete source. NPS pollution is often the cumulative effect of small amounts of contaminants gathered from a large area, a common example is the leaching out of nitrogen compounds from fertilized agricultural lands. Nutrient runoff in storm water from sheet flow over a field or a forest are also cited as examples of NPS pollution. Contaminated storm water washed off of parking lots, roads and highways, however, because this runoff is typically channeled into storm drain systems and discharged through pipes to local surface waters, it becomes a point source
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Afghanistan
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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
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Landlocked
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A landlocked state or landlocked country is a sovereign state entirely enclosed by land, or whose only coastlines lie on closed seas. There are currently 49 such countries, including five partially recognised states, only two, Bolivia and Paraguay in South America, lie outside Afro-Eurasia. As a rule, being landlocked creates political and economic handicaps that access to the high seas avoids, for this reason, states large and small across history have striven to gain access to open waters, even at great expense in wealth, bloodshed, and political capital. The economic disadvantages of being landlocked can be alleviated or aggravated depending on degree of development, language barriers, some historically landlocked countries are quite affluent, such as Switzerland, Luxembourg, and Austria, all of which frequently employ neutrality to their political advantage. The majority, however, are classified as Landlocked Developing Countries,9 of the 12 countries with the lowest Human Development Indices are landlocked. Historically, being landlocked has been disadvantageous to a countrys development and it cuts a nation off from such important sea resources as fishing, and impedes or prevents direct access to seaborne trade, a crucial component of economic and social advance. As such, coastal regions tended to be wealthier and more populated than inland ones. Paul Collier in his book The Bottom Billion argues that being landlocked in a poor geographic neighborhood is one of four major development traps by which a country can be held back. In general, he found that when a neighboring country experiences better growth, for landlocked countries, the effect is particularly strong, as they are limited in their trading activity with the rest of the world. He states, If you are coastal, you serve the world, if you are landlocked, others have argued that being landlocked may actually be a blessing as it creates a natural tariff barrier which protects the country from cheap imports. In some instances, this has led to more robust local food systems, Landlocked developing countries have significantly higher costs of international cargo transportation compared to coastal developing countries. Since Bosnia and Herzegovina is a new country, railways and ports have not been built for its need, there is no freight port along its short coastline at Neum, making it effectively landlocked, although there are plans to change this. Instead the port of Ploče in Croatia is used, after World War I, in the Treaty of Versailles, a part of Germany designated the Polish corridor was given to the new Second Polish Republic, for access to the Baltic Sea. This gave Poland a short coastline, but without a large harbour and this was also the pretext for making Danzig with its harbour the Free City of Danzig, to which Poland was given free access. However, the Germans placed obstacles to free access, especially when it came to military material. In response, the fishing harbour of Gdynia was soon greatly enlarged. Stettin was annexed by Poland after World War II, but Hamburg continued the contract so that part of the port may still be used for sea trade by a successor of Czechoslovakia, the Czech Republic. The Danube is a waterway, and thus landlocked Austria, Hungary, Moldova, Serbia
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Kabul
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Kabul is the capital of Afghanistan as well as its largest city, located in the eastern section of the country. According to a 2015 estimate, the population of the city was around 3,678,033 which includes all the ethnic groups. Rapid urbanization had made Kabul the worlds 64th largest city and the fifth fastest-growing city in the world, Kabul is said to be over 3,500 years old, mentioned since at least the time of the Achaemenid Empire. The city is at a location along the trade routes of South and Central Asia. It has been part of the Achaemenids, Seleucids, Mauryans, Kushans, Kabul Shahis, Saffarids, Ghaznavids, Later, it was controlled by the Mughal Empire until finally becoming part of the Durrani Empire in 1747. The city is located high up in a valley between the Hindu Kush mountains. Kabul became the capital of Afghanistan during the reign of Timur Shah Durrani, in the early 19th century, the British occupied the city but were compelled to abandon it. Relations between Afghanistan and Great Britain were later established, the city was occupied by the Soviets in 1979 but they too abandoned it after the 1988 Geneva Accords were signed. A civil war in the 1990s between various rebel groups destroyed much of the city, resulting in many casualties, since the removal of the Taliban from power in late 2001, the city gradually began rebuilding itself with assistance by the international community. Despite the many terrorist attacks by elements, the city is growing and developing. The city is divided into about 18 districts, the Kabul International Airport is located in the Wazir Akbar Khan district a few miles from the foreign embassies. The Parliament of Afghanistan, built by India, is located in the Kārte Seh district, Kabul, also spelled Cabool, Caubul, Kabol, or Cabul. The word Kubhā is mentioned in the Rigveda, one of the four sacred texts of Hinduism, and the Avesta. The Rigveda praises it as a city, a vision of paradise set in the mountains. The area in which the Kabul valley sits was ruled by the Medes before falling to the Achaemenids, there is a reference to a settlement called Kabura by the rulers of the Achaemenid Empire, It became a center of Zoroastrianism followed by Buddhism and Hinduism. The region became part of the Seleucid Empire but was given to the Indian Maurya Empire. The Greco-Bactrians captured Kabul from the Mauryans in the early 2nd century BC, indo-Scythians expelled the Indo-Greeks by the mid 1st century BC, but lost the city to the Kushan Empire about 100 years later. Some historians ascribe Kabul the Sanskrit name of Kamboja and it is mentioned as Kophes or Kophene in some classical writings
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Hindu Kush
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It forms the western section of the Hindu Kush Himalayan Region. It divides the valley of the Amu Darya to the north from the Indus River valley to the south, the eastern end of the Hindu Kush in the north merges with the Karakoram Range. Towards its southern end, it connects with the Spin Ghar Range near the Kabul River, the Hindu Kush range were a historically significant center of Buddhism with sites such as the Bamiyan Buddhas. The range and communities settled in it hosted ancient monasteries, important trade networks, Buddhism declined, then vanished, after Islam arrived in the region. The Hindu Kush range has also been the passageway during the invasions of the Indian subcontinent and this collision created the Himalayas, including the Hindu Kush. The Hindu Kush range remains geologically active and are still rising, the origins of the name Hindu Kush are uncertain, with multiple theories being propounded by different scholars and writers. The Persian-English dictionary indicates that the word koš is derived from the verb, the word and suffix -kush means kill, slay, death. In his travel memoirs about India, the 14th century Moroccan traveller Muhammad Ibn Battuta mentioned crossing into India via the passes of the Hindu Kush. In his Rihla, he mentions these mountains and the history of the range in slave trading, to Arab geographers, states Allan, Hindu Kush was the frontier boundary where Hindustan started. According to McColl, yet another possibility is that the name may be from the ancient Avestan language, the mountain range was also called Paropamisadae by Hellenic Greeks in the late first millennium BC. Some scholars remove the space, and refer to Hindu Kush as Hindukush, the mountains have historical significance in the Indian subcontinent and China. The Hindu Kush range was a center of Buddhism with sites such as the Bamiyan Buddhas. It has also been the passageway during the invasions of the Indian subcontinent, a region where the Taliban and Al Qaeda grew, Buddhism was widespread in the ancient Hindu Kush region. Ancient artwork of Buddhism include the giant rock carved statues called the Bamiyan Buddha and these statues were blown up by the Taliban Islamists. One of the early Buddhist schools, the Mahāsāṃghika-Lokottaravāda, was prominent in the area of Bamiyan, the Chinese Buddhist monk Xuanzang visited a Lokottaravāda monastery in the 7th century CE, at Bamiyan, Afghanistan. Some manuscripts are in the Gāndhārī language and Kharoṣṭhī script, while others are in Sanskrit, after the Islamic conquest of the region and Islam becoming the state religion, Buddhism vanished and locals became Muslims. The significance of the Hindu Kush mountain range has been recorded since the time of Darius I of Persia, alexander the Great entered the Indian subcontinent through the Hindu Kush as his army moved past Bactria into the Afghan valley in the spring of 329 BCE. He moved towards the Indus valley river region in 327 BCE, the region became a part of the Kushan Empire in centuries around the start of the common era
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Himalayas
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The Himalayas, or Himalaya, form a mountain range in Asia separating the plains of the Indian subcontinent from the Tibetan Plateau. The Himalayan range has the Earths highest peaks, including the highest, the Himalayas include over a hundred mountains exceeding 7,200 metres in elevation. By contrast, the highest peak outside Asia – Aconcagua, in the Andes – is 6,961 metres tall. The Himalayas are spread across five countries, Bhutan, India, Nepal, China, the Himalayan range is bordered on the northwest by the Karakoram and Hindu Kush ranges, on the north by the Tibetan Plateau, and on the south by the Indo-Gangetic Plain. Some of the major rivers, the Indus, the Ganges, and the Tsangpo-Brahmaputra, rise in the Himalayas. The Himalayas have profoundly shaped the cultures of South Asia, many Himalayan peaks are sacred in Hinduism and Buddhism. Lifted by the subduction of the Indian tectonic plate under the Eurasian Plate and its western anchor, Nanga Parbat, lies just south of the northernmost bend of Indus river. Its eastern anchor, Namcha Barwa, is just west of the bend of the Tsangpo river. The range varies in width from 400 kilometres in the west to 150 kilometres in the east, the name of the range derives from the Sanskrit Himā-laya, from himá and ā-laya. They are now known as the Himalaya Mountains, usually shortened to the Himalayas, formerly, they were described in the singular as the Himalaya. This was also previously transcribed Himmaleh, as in Emily Dickinsons poetry and Henry David Thoreaus essays. The mountains are known as the Himālaya in Nepali and Hindi, the Himalaya or The Land of Snow in Tibetan, the Hamaleh Mountain Range in Urdu, the flora and fauna of the Himalayas vary with climate, rainfall, altitude, and soils. The climate ranges from tropical at the base of the mountains to permanent ice, the amount of yearly rainfall increases from west to east along the southern front of the range. This diversity of altitude, rainfall and soil conditions combined with the high snow line supports a variety of distinct plant. The extremes of high altitude combined with extreme cold favor extremophile organisms, the unique floral and faunal wealth of the Himalayas is undergoing structural and compositional changes due to climate change. The increase in temperature is shifting various species to higher elevations, the oak forest is being invaded by pine forests in the Garhwal Himalayan region. There are reports of early flowering and fruiting in some species, especially rhododendron, apple. The highest known tree species in the Himalayas is Juniperus tibetica located at 4,900 metres in Southeastern Tibet, the Himalayan range is one of the youngest mountain ranges on the planet and consists mostly of uplifted sedimentary and metamorphic rock
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Pamir Mountains
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The Pamir Mountains, or the Pamirs, are a mountain range in Central Asia at the junction of the Himalayas with the Tian Shan, Karakoram, Kunlun, Hindu Kush and Hindu Raj ranges. They are among the world’s highest mountains, the precise extent of the Pamir Mountains is debatable. They lie mostly in Gorno-Badakhshan province of Tajikistan, to the north they join the Tian Shan mountains along the Alay Valley of Kyrgyzstan. To the south border the Hindu Kush mountains along Afghanistans Wakhan Corridor. Since Victorian times, they have known as the Roof of the World. The name Pamir is used commonly in Modern Chinese and loaned as simplified Chinese, 帕米尔, traditional Chinese, 帕米爾, pinyin. The three highest mountains in the Pamirs core are Ismoil Somoni Peak,7,495 m, Ibn Sina Peak,7,134 m, in the Eastern Pamirs, Chinas Kongur Tagh is the highest at 7,649 m. There are many glaciers in the Pamir Mountains, including the 77 km long Fedchenko Glacier, the longest in the former USSR, covered in snow throughout the year, the Pamirs have long and bitterly cold winters, and short, cool summers. Annual precipitation is about 130 mm, which supports grasslands but few trees, the East-Pamir, in the centre of which the massifs of Mustagh Ata and Kongur Tagh are situated, shows from the W-margin of the Tarim Basin an East-West extension of c.200 km. Its North-South extension from King Ata Tagh up to the North-West Kunlun foothills amounts to c.170 km. From this glacier area an outlet glacier has flowed down to the north-east through the Gez valley up to c.1850 m asl and this outlet glacier received inflow from the Kaiayayilak glacier from the Kongur-north-flank. From the north-adjacent Kara Bak Tor -massif the Oytag valley glacier in the same exposition flowed also down up to c.1850 m asl. At glacial times the glacier snowline as altitude limit between glacier nourishing area and ablation zone, was lowered about 820 to 1250 altitude metres against today. Under the condition of comparable proportions of precipitation there results from this a depression of temperature of at least 5 to 7.5 °C. Coal is mined in the west, though sheep herding in upper meadowlands are the source of income for the region. This section is based on the book by R. Middleton, about 138 BC Zhang Qian reached the Fergana Valley northwest of the Pamirs. Ptolemy vaguely describes a route through the area. From about 600 AD, Buddhist pilgrims travelled on both sides of the Pamirs to reach India from China, in 747 a Tang army was on the Wakhan River
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Eurasian Plate
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It also includes oceanic crust extending westward to the Mid-Atlantic Ridge and northward to the Gakkel Ridge. The eastern side is a boundary with the North American Plate to the north and a boundary with the Philippine Sea Plate to the south, and possibly with the Okhotsk Plate and the Amurian Plate. The southerly side is a boundary with the African Plate to the west, the Arabian Plate in the middle, the westerly side is a divergent boundary with the North American Plate forming the northernmost part of the Mid-Atlantic Ridge, which is straddled by Iceland. The geodynamics of central Asia is dominated by the interaction between the Eurasian and Indian Plates, in this area, many subplates or crust blocks have been recognized, which form the Central Asian and the East Asian transit zones
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Wakhan Corridor
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The Wakhan Corridor is the narrow strip of territory in northeastern Afghanistan that extends to China and separates Tajikistan from Pakistan. The corridor, wedged between the Pamirs to the north and the Karakoram range to the south, is about 350 km long, inside the Wakhan Corridor is a high mountain valley from which the Panj and Pamir Rivers emerge and form the Amu Darya. A trade route through the valley has been used by travelers going to and from East, South, Wakhan Corridor can also refer to the valley and the trade route. The closure of the Afghan-Chinese border crossing at the Wakhjir Pass at the east end of the Wakhan Corridor, the corridor was a political creation of The Great Game. On its south side, the Durand Line agreement of 1893 marked the boundary between British India and Afghanistan and this left a narrow strip of land as a buffer between the two empires, which became known as the Wakhan Corridor in the 20th century. As of 2010, the Wakhan Corridor had 12,000 inhabitants, the northern part of the Wakhan is also referred to as the Pamir. The Wakhan Corridor forms the panhandle of Afghanistans Badakhshan Province, at its western entrance near the Afghan town of Ishkashim, the corridor is 18 km wide. The western third of the corridor varies from 13–30 km in width, at its eastern end, the corridor forks into two prongs that wrap around a salient of Chinese territory, forming the two countries 92 km boundary. The Wakhjir Pass, on the southeastern prong is about 300 km from Ishkashim, the easternmost point of the northeastern prong is about 350 km from Ishkashim. On the Chinese side of the border is Tashkurgan Tajik Autonomous County of Xinjiang Uyghur Autonomous Region, the northern border is formed by the Pamir River and Lake Zorkul in the west and the high peaks of the Pamir Mountains in the east. To the north is Tajikistans Gorno-Badakhshan Autonomous region, in the south, the corridor is bounded by the high mountains of the Hindu Kush and Karakoram. The Broghol and Irshad Passes along the southern flank offer access, respectively, to Khyber Pakhtunkhwa, the corridor is higher in the east and descends to about 3,037 m at Ishkashim. The Wakhjir River emerges from an ice cave on the Afghan side of the Wakhjir Pass and flows west, joining the Bozai Darya near the village of Bozai Gumbaz and forms the Wakhan River. The Wakhan River then joins the Pamir River near Kala-i-Panj to form the Panj River, Chinese considers the valley east of Wakhjir Pass on the Chinese side connecting Taghdumbash Pamir to be part of Wakhan Corridor. The high mountain valley is about 100 km long and this valley, through which the Tashkurgan River flows, is generally about 3–5 km wide and less than 1 km at its narrowest point. This entire valley on the Chinese side is closed to visitors, however, local residents, although the terrain is extremely rugged, the Corridor was historically used as a trading route between Badakhshan and Yarkand. It appears that Marco Polo came this way, the Portuguese Jesuit priest Bento de Goes crossed from the Wakhan to China between 1602 and 1606. In May 1906, Sir Aurel Stein explored the Wakhan and reported that at time,100 pony loads of goods crossed annually to China
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