1.
Laos
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Present day Laos traces its historic and cultural identity to the kingdom of Lan Xang Hom Khao, which existed for four centuries as one of the largest kingdoms in Southeast Asia. Due to Lan Xangs central geographical location in Southeast Asia, the kingdom was able to become a hub for overland trade. After a period of conflict, Lan Xang broke off into three separate kingdoms— Luang Phabang, Vientiane and Champasak. In 1893, it became a French protectorate, with the three territories uniting to form what is now known as the country of Laos and it briefly gained independence in 1945 after Japanese occupation, but returned to French rule until it was granted autonomy in 1949. Laos became independent in 1953, with a monarchy under Sisavang Vong. Shortly after independence, a civil war ended the monarchy. Laos is a one-party socialist republic and it espouses Marxism and is governed by the Lao Peoples Revolutionary Party, in which the party leadership is dominated by military figures. The Socialist Republic of Vietnam and the Vietnam Peoples Army continue to have significant influence in Laos, other large cities include Luang Prabang, Savannakhet, and Pakse. Laos is a country with the politically and culturally dominant Lao people making up approximately 60 percent of the population. Mon-Khmer groups, the Hmong, and other hill tribes, accounting for 40 percent of the population, live in the foothills. It is a member of the Asia-Pacific Trade Agreement, Association of Southeast Asian Nations, East Asia Summit, Laos applied for membership of the World Trade Organization in 1997, on 2 February 2013, it was granted full membership. According to the anti-corruption non-governmental organisation Transparency International, Laos remains one of the most corrupt countries in the world and this has deterred foreign investment and created major problems with the rule of law, including the nations ability to enforce contract and business regulation. This has contributed to a third of the population of Laos currently living below the poverty line. Laos has an economy, with one of the lowest annual incomes in the world. In 2014, the country ranked 141st on the Human Development Index, according to the Global Hunger Index, Laos ranks as the 29th hungriest nation in the world out of the list of the 52 nations with the worst hunger situation. Laos has also had a human rights record. In the Lao language, the name is Muang Lao or Pathet Lao. Stone artefacts including Hoabinhian types have been found at sites dating to the Late Pleistocene in northern Laos, archaeological evidence suggests agriculturist society developed during the 4th millennium BC
2.
Southeast Asia
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Southeast Asia or Southeastern Asia is a subregion of Asia, consisting of the countries that are geographically south of China, east of India, west of New Guinea and north of Australia. The region lies near the intersection of geological plates, with seismic and volcanic activity. Southeast Asia consists of two regions, Mainland Southeast Asia, also known historically as Indochina, comprising Vietnam, Laos, Cambodia, Thailand, Myanmar. Maritime Southeast Asia, comprising Indonesia, East Malaysia, Singapore, Philippines, East Timor, Brunei, Cocos Islands, definitions of Southeast Asia vary, but most definitions include the area represented by the countries listed below. All of the states are members of the Association of Southeast Asian Nations, the area, together with part of South Asia, was widely known as the East Indies or simply the Indies until the 20th century. Sovereignty issues exist over some territories in the South China Sea, Papua New Guinea has stated that it might join ASEAN, and is currently an observer. Southeast Asia is geographically divided into two subregions, namely Mainland Southeast Asia and Maritime Southeast Asia, Mainland Southeast Asia includes, Maritime Southeast Asia includes, The Andaman and Nicobar Islands of India are geographically considered part of Southeast Asia. Eastern Bangladesh and the Seven Sister States of India are culturally part of Southeast Asia, the eastern half of Indonesia and East Timor are considered to be biogeographically part of Oceania. Homo sapiens reached the region by around 45,000 years ago, homo floresiensis also lived in the area up until 12,000 years ago, when they became extinct. Austronesian people, who form the majority of the population in Indonesia, Malaysia, Brunei, East Timor. Solheim and others have shown evidence for a Nusantao maritime trading network ranging from Vietnam to the rest of the archipelago as early as 5000 BC to 1 AD. The peoples of Southeast Asia, especially those of Austronesian descent, have been seafarers for thousands of years and their vessels, such as the vinta, were ocean-worthy. Magellans voyage records how much more manoeuvrable their vessels were, as compared to the European ships, Passage through the Indian Ocean aided the colonisation of Madagascar by the Austronesian people, as well as commerce between West Asia and Southeast Asia. Gold from Sumatra is thought to have reached as far west as Rome and this was later replaced by Hinduism. Theravada Buddhism soon followed in 525, in the 15th century, Islamic influences began to enter. This forced the last Hindu court in Indonesia to retreat to Bali, in Mainland Southeast Asia, Burma, Cambodia and Thailand retained the Theravada form of Buddhism, brought to them from Sri Lanka. This type of Buddhism was fused with the Hindu-influenced Khmer culture, very little is known about Southeast Asian religious beliefs and practices before the advent of Indian merchants and religious influences from the 2nd century BCE onwards. Prior to the 13th century CE, Hinduism and Buddhism were the religions in Southeast Asia
3.
Thailand
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Thailand, officially the Kingdom of Thailand, formerly known as Siam, is a country at the centre of the Indochinese peninsula in Southeast Asia. With a total area of approximately 513,000 km2, Thailand is the worlds 51st-largest country and it is the 20th-most-populous country in the world, with around 66 million people. The capital and largest city is Bangkok, Thailand is a constitutional monarchy and has switched between parliamentary democracy and military junta for decades, the latest coup being in May 2014 by the National Council for Peace and Order. Its capital and most populous city is Bangkok and its maritime boundaries include Vietnam in the Gulf of Thailand to the southeast, and Indonesia and India on the Andaman Sea to the southwest. The Thai economy is the worlds 20th largest by GDP at PPP and it became a newly industrialised country and a major exporter in the 1990s. Manufacturing, agriculture, and tourism are leading sectors of the economy and it is considered a middle power in the region and around the world. The country has always been called Mueang Thai by its citizens, by outsiders prior to 1949, it was usually known by the exonym Siam. The word Siam has been identified with the Sanskrit Śyāma, the names Shan and A-hom seem to be variants of the same word. The word Śyâma is possibly not its origin, but a learned, another theory is the name derives from Chinese, Ayutthaya emerged as a dominant centre in the late fourteenth century. The Chinese called this region Xian, which the Portuguese converted into Siam, the signature of King Mongkut reads SPPM Mongkut King of the Siamese, giving the name Siam official status until 24 June 1939 when it was changed to Thailand. Thailand was renamed Siam from 1945 to 11 May 1949, after which it reverted to Thailand. According to George Cœdès, the word Thai means free man in the Thai language, ratcha Anachak Thai means kingdom of Thailand or kingdom of Thai. Etymologically, its components are, ratcha, -ana- -chak, the Thai National Anthem, written by Luang Saranupraphan during the extremely patriotic 1930s, refers to the Thai nation as, prathet Thai. The first line of the anthem is, prathet thai ruam lueat nuea chat chuea thai, Thailand is the unity of Thai flesh. There is evidence of habitation in Thailand that has been dated at 40,000 years before the present. Similar to other regions in Southeast Asia, Thailand was heavily influenced by the culture and religions of India, Thailand in its earliest days was under the rule of the Khmer Empire, which had strong Hindu roots, and the influence among Thais remains even today. Voretzsch believes that Buddhism must have been flowing into Siam from India in the time of the Indian Emperor Ashoka of the Maurya Empire, later Thailand was influenced by the south Indian Pallava dynasty and north Indian Gupta Empire. The Menam Basin was originally populated by the Mons, and the location of Dvaravati in the 7th century, the History of the Yuan mentions an embassy from the kingdom of Sukhothai in 1282
4.
Vietnam
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Vietnam, officially the Socialist Republic of Vietnam, is the easternmost country on the Indochina Peninsula in Southeast Asia. With an estimated 92.7 million inhabitants as of 2016, it is the worlds 14th-most-populous country, and its capital city has been Hanoi since the reunification of North and South Vietnam in 1976, with Ho Chi Minh City as a historical city as well. The northern part of Vietnam was part of Imperial China for over a millennium, an independent Vietnamese state was formed in 939, following a Vietnamese victory in the Battle of Bạch Đằng River. Following a Japanese occupation in the 1940s, the Vietnamese fought French rule in the First Indochina War, thereafter, Vietnam was divided politically into two rival states, North Vietnam, and South Vietnam. Conflict between the two sides intensified in what is known as the Vietnam War, the war ended with a North Vietnamese victory in 1975. Vietnam was then unified under a communist government but remained impoverished, in 1986, the government initiated a series of economic and political reforms which began Vietnams path towards integration into the world economy. By 2000, it had established relations with all nations. Since 2000, Vietnams economic growth rate has been among the highest in the world and its successful economic reforms resulted in its joining the World Trade Organization in 2007. It is also a member of the Asia-Pacific Economic Cooperation and the Organisation Internationale de la Francophonie, Vietnam remains one of the worlds four remaining one-party socialist states officially espousing communism. The name Việt Nam is a variation of Nam Việt, a name that can be traced back to the Triệu Dynasty of the 2nd century BC. The word Việt originated as a form of Bách Việt. The form Vietnam is first recorded in the 16th-century oracular poem Sấm Trạng Trình, the name has also been found on 12 steles carved in the 16th and 17th centuries, including one at Bao Lam Pagoda in Haiphong that dates to 1558. Then, as recorded, rewarded Yuenan/Vietnam as their nations name, to also show that they are below the region of Baiyue/Bach Viet. Between 1804 and 1813, the name was used officially by Emperor Gia Long and it was revived in the early 20th century by Phan Bội Châus History of the Loss of Vietnam, and later by the Vietnamese Nationalist Party. The country was usually called Annam until 1945, when both the government in Huế and the Viet Minh government in Hanoi adopted Việt Nam. Archaeological excavations have revealed the existence of humans in what is now Vietnam as early as the Paleolithic age, Homo erectus fossils dating to around 500,000 BC have been found in caves in Lạng Sơn and Nghệ An provinces in northern Vietnam. The oldest Homo sapiens fossils from mainland Southeast Asia are of Middle Pleistocene provenance, teeth attributed to Homo sapiens from the Late Pleistocene have also been found at Dong Can, and from the Early Holocene at Mai Da Dieu, Lang Gao and Lang Cuom. The Hồng Bàng dynasty of the Hùng kings is considered the first Vietnamese state, in 257 BC, the last Hùng king was defeated by Thục Phán, who consolidated the Lạc Việt and Âu Việt tribes to form the Âu Lạc, proclaiming himself An Dương Vương
5.
Burma
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Myanmar, officially the Republic of the Union of Myanmar and also known as Burma, is a sovereign state in South East Asia bordered by Bangladesh, India, China, Laos and Thailand. About one third of Myanmars total perimeter of 5,876 km, forms an uninterrupted coastline of 1,930 km along the Bay of Bengal, the countrys 2014 census revealed a much lower population than expected, with 51 million people recorded. Myanmar is 676,578 square kilometres in size and its capital city is Naypyidaw and its largest city and former capital city is Yangon. Early civilizations in Myanmar included the Tibeto-Burman-speaking Pyu city-states in Upper Burma, the Pagan Kingdom fell due to the Mongol invasions and several warring states emerged. In the 16th century, reunified by the Taungoo Dynasty, the country was for a period the largest empire in the history of Mainland Southeast Asia. The early 19th century Konbaung Dynasty ruled over an area included modern Myanmar and briefly controlled Manipur. The British invaded Myanmar after three Anglo-Burmese Wars in the 19th century and the became a British colony. Myanmar became an independent nation in 1948, initially as a nation and then, following a coup détat in 1962. For most of its independent years, the country has been engrossed in rampant ethnic strife, during this time, the United Nations and several other organisations have reported consistent and systematic human rights violations in the country. In 2011, the junta was officially dissolved following a 2010 general election. While former military leaders still wield enormous power in the country, there is, however, continuing criticism of the governments treatment of the Muslim Rohingya minority and its poor response to the religious clashes. In the landmark 2015 election, Aung San Suu Kyis party won a majority in both houses, Myanmar is a country rich in jade and gems, oil, natural gas and other mineral resources. In 2013, its GDP stood at US$56.7 billion, the income gap in Myanmar is among the widest in the world, as a large proportion of the economy is controlled by supporters of the former military government. As of 2016, according to the Human Development Index, Myanmar had a level of human development. The renaming remains a contested issue, many political and ethnic opposition groups and countries continue to use Burma because they do not recognise the legitimacy of the ruling military government or its authority to rename the country. The countrys official name is the Republic of the Union of Myanmar. Countries that do not officially recognise that name use the long form Union of Burma instead, in English, the country is popularly known as either Burma or Myanmar /ˈmjɑːnˌmɑːr/. Both these names are derived from the name of the majority Burmese Bamar ethnic group, Myanmar is considered to be the literary form of the name of the group, while Burma is derived from Bamar, the colloquial form of the groups name
6.
Cambodia
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Cambodia, officially known as the Kingdom of Cambodia, is a country located in the southern portion of the Indochina Peninsula in Southeast Asia. It is 181,035 square kilometres in area, bordered by Thailand to the northwest, Laos to the northeast, Vietnam to the east, Cambodia has a population of over 15 million. The official religion is Theravada Buddhism, practiced by approximately 95 percent of the population, the countrys minority groups include Vietnamese, Chinese, Chams, and 30 hill tribes. The capital and largest city is Phnom Penh, the political, economic, the kingdom is a constitutional monarchy with Norodom Sihamoni, a monarch chosen by the Royal Throne Council, as head of state. The head of government is Hun Sen, who is currently the longest serving leader in South East Asia and has ruled Cambodia for over 25 years. In 802 AD, Jayavarman II declared himself king, uniting the warring Khmer princes of Chenla under the name Kambuja. The Indianized kingdom built monumental temples including Angkor Wat, now a World Heritage Site, after the fall of Angkor to Ayutthaya in the 15th century, a reduced and weakened Cambodia was then ruled as a vassal state by its neighbours. In 1863 Cambodia became a protectorate of France which doubled the size of the country by reclaiming the north, the Vietnam War extended into the country with the US bombing of Cambodia from 1969 until 1973. Following the Cambodian coup of 1970, the king gave his support to his former enemies. Following the 1991 Paris Peace Accords, Cambodia was governed briefly by a United Nations mission, the UN withdrew after holding elections in which around 90 percent of the registered voters cast ballots. The 1997 coup placed power solely in the hands of Prime Minister Hun Sen and the Cambodian Peoples Party, important sociopolitical issues includes widespread poverty, pervasive corruption, lack of political freedoms, low human development, and a high rate of hunger. While per capita income remains low compared to most neighbouring countries, agriculture remains the dominant economic sector, with strong growth in textiles, construction, garments, and tourism leading to increased foreign investment and international trade. Cambodia scored dismally in an annual index ranking the rule of law in 102 countries, placing 99th overall, Cambodia also faces environmental destruction as an imminent problem. The most severe activity in this regard is considered to be the countrywide deforestation, the Kingdom of Cambodia is the official English name of the country. The English Cambodia is an anglicisation of the French Cambodge, which in turn is the French transliteration of the Khmer Kampuchea, Kampuchea is the shortened alternative to the countrys official name in Khmer, Preah Reacheanachak Kampuchea. The Khmer endonym Kampuchea derives from the Sanskrit name Kambujadeśa, composed of देश, desa and कम्बोज, Kambujas, colloquially, Cambodians refer to their country as either Srok Khmer, meaning Khmers Land, or the slightly more formal Prateh Kampuchea, literally Country of Kampuchea. The name Cambodia is used most often in the Western world while Kampuchea is more used in the East. Excavations in its lower layers produced a series of dates as of 6000 BC
7.
People's Republic of 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
8.
Geographic coordinates
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A geographic coordinate system is a coordinate system used in geography that enables every location on Earth to be specified by a set of numbers, letters or symbols. The coordinates are chosen such that one of the numbers represents a vertical position. A common choice of coordinates is latitude, longitude and elevation, to specify a location on a two-dimensional map requires a map projection. The invention of a coordinate system is generally credited to Eratosthenes of Cyrene. Ptolemy credited him with the adoption of longitude and latitude. Ptolemys 2nd-century Geography used the prime meridian but measured latitude from the equator instead. Mathematical cartography resumed in Europe following Maximus Planudes recovery of Ptolemys text a little before 1300, in 1884, the United States hosted the International Meridian Conference, attended by representatives from twenty-five nations. Twenty-two of them agreed to adopt the longitude of the Royal Observatory in Greenwich, the Dominican Republic voted against the motion, while France and Brazil abstained. France adopted Greenwich Mean Time in place of local determinations by the Paris Observatory in 1911, the latitude of a point on Earths surface is the angle between the equatorial plane and the straight line that passes through that point and through the center of the Earth. Lines joining points of the same latitude trace circles on the surface of Earth called parallels, as they are parallel to the equator, the north pole is 90° N, the south pole is 90° S. The 0° parallel of latitude is designated the equator, the plane of all geographic coordinate systems. The equator divides the globe into Northern and Southern Hemispheres, the longitude of a point on Earths surface is the angle east or west of a reference meridian to another meridian that passes through that point. All meridians are halves of great ellipses, which converge at the north and south poles, the prime meridian determines the proper Eastern and Western Hemispheres, although maps often divide these hemispheres further west in order to keep the Old World on a single side. The antipodal meridian of Greenwich is both 180°W and 180°E, the combination of these two components specifies the position of any location on the surface of Earth, without consideration of altitude or depth. The grid formed by lines of latitude and longitude is known as a graticule, the origin/zero point of this system is located in the Gulf of Guinea about 625 km south of Tema, Ghana. To completely specify a location of a feature on, in, or above Earth. Earth is not a sphere, but a shape approximating a biaxial ellipsoid. It is nearly spherical, but has an equatorial bulge making the radius at the equator about 0. 3% larger than the radius measured through the poles, the shorter axis approximately coincides with the axis of rotation
9.
Annamite Range
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The Annamite Range or the Annamese Mountains is a mountain range of eastern Indochina, which extends approximately 1,100 km through Laos, Vietnam, and a small area in northeast Cambodia. It is known in Vietnamese as Dãy Trường Sơn, in Lao as Xai Phou Luang, the mountain range is also referred to variously as Annamese Range, Annamese Mountains, Annamese Cordillera, Annamite Mountains and Annamite Cordillera. The highest points of the range are 2,819 m high Phou Bia,2,720 m high Phu Xai Lai Leng, the latter is located at the northwestern edge of the Triassic Kontum Massif, in central Vietnam. Important passes are the Nape Pass and the Mu Gia Pass, the Annamite Range runs parallel to the Vietnamese coast, in a gentle curve which divides the basin of the Mekong River from Vietnams narrow coastal plain along the South China Sea. Most of the crests are on the Laotian side, the eastern slope of the range rises steeply from the plain, drained by numerous short rivers. The western slope is gentle, forming significant plateaus before descending to the banks of the Mekong. The range itself has three main plateaus, from north to south, Phouane Plateau, Nakai Plateau and Bolaven Plateau, Laos lies mostly within the Mekong basin, west of the divide, although most of Houaphan Province and a portion of Xiangkhoang Province lie east of the divide. Most of Vietnam lies east of the divide, although Vietnams Tây Nguyên region lies west of the divide, an-nam means in Chinese to pacify the south, referring to the regions location relative to China. The range is home to creatures such as the recently discovered Annamite rabbit and the antelope-like saola, the Douc langur, the large gaur, the Chinese pangolin. Most of the highlands like the Annamite Range and the Central Highlands were populated by ethnic minorities who were not Vietnamese during the 20th centurys start
10.
Luang Prabang Range
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The Luang Prabang Range, named after Luang Prabang, is a mountain range straddling northwestern Laos and Northern Thailand. Most of the range is located in Sainyabuli Province, as well as Nan and Uttaradit Provinces, with parts in Phitsanulok. Several rivers such as the Nan, Pua and Wa river, have their source in this range, Phu Fa waterfall, the biggest and the tallest waterfall in Nan Province, is also located in these mountains. This range is part of the Luang Prabang montane rain forests ecoregion, geologically its composition is similar to that of the parallel Khun Tan Range and the Phi Pan Nam Range, both located further west. The Luang Prabang mountains are the easternmost range of the Thai highlands, the range runs roughly in a North/South direction between the Mekong and the Nan River. The highest point of the range is 2,120 m high Phu Soi Dao, many of the important peaks are located at the border. Like in most ranges of the area, a proportion of the original forest cover has disappeared owing to shifting agricultural practices. The area is allegedly a heartland for military involvement in timber trade, in 1904 the Laotian area of the range was ceded from Siam to the French Indochina colony. Following the Franco-Thai War in 1941 it was annexed by Thailand again under the name Lan Chang Province, certain Hill tribe communities live in the range, like the Khmu and the Hmong, whose tribal villages are located on both sides of the mountain range. Most Hmong villages in Sainyabuli Province did not see any fighting, however, later they were persecuted all the same by the Vietnamese and the Pathet Lao soldiers, who regarded them as traitors, thus many fled across the border. There are refugee camps on the Thai side of the range, the southern part of the range saw some confrontation between December 1987 and February 1988 when Thai and Laotian forces engaged in cross-border fighting. Known as Thai–Laotian Border War, this conflict was caused by a dispute involving the map made by French surveyors in 1907 to mark the borders between Siam and French Indochina. The Thai-Lao Joint Boundary Commission was established in 1996 to clarify the 1, 810-kilometre boundary, Border demarcation is still going on. Yetis are said to have spotted in the remote Mae Charim area of the range. Presently on the Thai side of the Luang Prabang Range some of the Hmong communities are regularly visited by organized tourist groups, River Wa is a popular river for white water rafting between July and December. There are large swathes of protected areas on the Thai side of the Luang Prabang Range, on the Lao side there is only one. The Nam Phouy National Biodiversity Conservation Area, a protected area in Laos home to many wild elephants, is located in a forested sector close to the Thai border. The projected reservoir of Lower Nam Phoun dam, however, is partly within the Nam Phouy NBCA, Phu Miang-Phu Thong Wildlife Sanctuary is another protected area on the Thai side
11.
Plain of Jars
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The Plain of Jars is a megalithic archaeological landscape in Laos. It consists of thousands of stone jars scattered around the upland valleys, the jars are mostly arranged in clusters ranging in number from one to several hundred. The Xieng Khouang Plateau is located at the end of the Annamese Cordillera. French researcher Madeleine Colani concluded in 1930 that the jars were associated with prehistoric burial practices, excavation by Lao and Japanese archaeologists in the intervening years has supported this interpretation with the discovery of human remains, burial goods and ceramics around the jars. The Plain of Jars is dated to the Iron Age and is one of the most important prehistoric sites in Southeast Asia, more than 90 jar sites have been identified within Xiangkhouang Province. Each site has one to 400 stone jars. The jars vary in height and diameter between 1m and 3m and are all hewn from rock and their shape is cylindrical with the bottom always wider than the top. The stone jars are undecorated, with the exception of a jar at Site 1. This jar has a human frogman bas-relief carved on the exterior, parallels between the frogman and the rock painting at Huashan in Guangxi, China have been drawn. The bas-relief carvings are thought to depict monkeys, tigers and frogs, no in situ lid has ever been found. Stone discs have also been found, the discs, which differ from the lids, have at least one flat side and are grave markers which were placed on the surface to cover or mark a burial pit. These grave markers appear more infrequently than jars, but are found in close proximity, similar are stone grave markers, these stones are unworked, but have been placed intentionally to mark a grave. To the north of Xieng Khouang an extensive network of intentionally placed largely unworked stones marking elaborate burial pits and these have been dated to the Bronze Age. The jars lie in clusters on the lower footslopes and mountain ridges of the surrounding the central plateau. Several quarry sites have been recorded, usually close to the jar sites, five rock types have been identified, sandstone, granite, conglomerate, limestone and breccia. The majority of the jars are sandstone and it is assumed that Plain of Jars people used iron chisels to manufacture the jars, although no conclusive evidence for this exists. Regional differences in jar shape have been noted, while the differences in most cases can be attributed to choice and manipulation of rock source, some differences in form appear to be unique to specific sites. A cave located at Site 1 is a limestone formation with an opening to the northwest
12.
Xiangkhoang Plateau
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The Xiangkhouang Plateau or Xiangkhoang Plateau, also known in French as Plateau du Tran-Ninh is a plateau in the north of Laos. The landscape is characterized by mountains, rugged karst formations and verdant valleys with plenty of rivers, caves. The Luang Prabang Range, and the Annamite Range separate the plateau from Thailand, the ranges of the plateau are sandstone and limestone mountains between 2000 and 2800 meters high. The highest mountain of Laos, Phou Bia, is located to the south of the Xiangkhoang, altitudes within the plateau area may reach 1000 m. Several tributaries of the Mekong drain in the plateau, such as the Nam Ngum, Ngiap, the major town in the area is the capital of Phonsavan. The plateau gives its name to present-day Xiangkhouang Province in which Phonsavan is located, the plateau is the location of the Plain of Jars, which is a collective name for several sites with funerary archeological remains nominated for UNESCO World Heritage status. The plateau is one of the most heavily contaminated areas in the world from unexploded cluster munitions also called UXO. Physical map of Laos Laos, Xieng Khouang Agricultural Development Project
13.
Swidden
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Slash-and-burn agriculture, or fire–fallow cultivation, is a farming method that involves the cutting and burning of plants in a forest or woodland to create a field called a swidden. In subsistence agriculture, slash-and-burn typically uses little technology and it is often applied in shifting cultivation agriculture and in transhumance livestock herding. Slash-and-burn is used by 200–500 million people worldwide, in 2004 it was estimated that in Brazil alone,500,000 small farmers each cleared an average of one hectare of forest per year. The technique is not scalable or sustainable for large human populations, methods such as Inga alley farming have been proposed as alternatives which would cause less environmental degradation. Historically, slash-and-burn cultivation has been practiced throughout much of the world and this happened in the river valleys of Egypt and Mesopotamia. Due to this decrease in food hunting, as human populations increased. Some groups could easily plant their crops in fields along river valleys. In this context, humans used slash-and-burn agriculture to more land to make it suitable for plants. Thus, since Neolithic times, slash-and-burn techniques have been used for converting forests into crop fields. Fire was used before the Neolithic as well, and by hunter-gatherers up to present times, clearings created by fire were made for many reasons, such as to draw game animals and to promote certain kinds of edible plants such as berries. Slash-and-burn fields are used and owned by a family until the soil is exhausted. At this point the ownership rights are abandoned, the family clears a new field, after a few decades, another family or clan may then use the land and claim usufructuary rights. In such a system there is no market in farmland, so land is not bought or sold in the open market. In slash-and-burn agriculture, forests are typically cut months before a dry season, the slash is permitted to dry, and then burned in the following dry season. The resulting ash fertilizes the soil and the field is then planted at the beginning of the next rainy season with crops such as upland rice, maize, cassava. Most of this work is typically done by hand, using basic tools as machetes, axes, hoes. Large families or clans wandering in the lush woodlands long continued to be the most common form of life through human prehistory, axes to fell trees and sickles for harvesting grain were the only tools people might bring with them. All other tools were made from materials found at the site, such as fire stakes of birch, long rods
14.
Phou Bia
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Phou Bia is the highest mountain in Laos and is located in the Annamese Cordillera, at the southern limit of the Xiangkhoang Plateau in Xiangkhouang Province. Owing to its altitude, the climate is cold and the area around the mountain is mostly cloudy, although no snow has been reported for decades, it is documented that as late as the first years of the 20th century, snow fell occasionally on its top. On 10 April 1970, an Air America C-130A aircraft crashed into the mountain, the area is remote, covered with jungle, and has been used by Hmong guerilla soldiers. In the 1970s, ca 60,000 Hmong supporting FAC operations took refuge at the Phou Bia massif, there have been reports of smaller Hmong hideouts in the area as recently as 2006. Phou Bia rises in a military area near the abandoned Long Chen air base. As of July 2008, there had no known ascent by a non-Lao person for at least 30 years. List of mountains in Laos List of Southeast Asian mountains Map of Laos
15.
Phu Soi Dao
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Phu Soi Dao is a mountain in Southeast Asia. It is 2120 metres tall and rises at the end of the Luang Prabang Range. Phu Soi Dao National Park is located on the Thai side of the range in Phitsanulok, pinus kesiya, Betula alnoides, Schima wallichii and Shorea siamensis are among the species of trees present in the forest. Utricularia spinomarginata and Utricularia phusoidaoensis are endemic plants on Phu Soi Dao, there are numerous waterfalls in the range area. List of mountains in Thailand Thai–Laotian Border War Peakbagger listing
16.
Vientiane
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Vientiane is the capital and largest city of Laos, on the banks of the Mekong River near the border with Thailand. Vientiane became the capital in 1563 due to fears of a Burmese invasion, Vientiane was the administrative capital during French rule and, due to economic growth in recent times, is now the economic centre of Laos. The estimated population of the city is 760,000, the city hosted the 25th Southeast Asian Games in December 2009 celebrating the 50 years of Southeast Asian Games. The name of the city is derived from Pali, the language of Theravada Buddhism. The romanised spelling Vientiane is of French origin, and reflects the difficulty the French had in pronouncing the sound in the Lao language. A common English-based spelling is Viangchan, or occasionally Wiangchan, Thattaradtha founded a city called Maha Thani Si Phan Phao on the western banks of the Mekong River, this city was said to have later become todays Udon Thani, Thailand. One day, a seven-headed Naga told Thattaradtha to start a new city on the east bank of the river opposite Maha Thani Si Phan Phao, the prince called this city Chanthabuly Si Sattanakhanahud, which was said to be the predecessor of modern Vientiane. Contrary to the Phra Lak Phra Lam, most historians believe Vientiane was an early Khmer settlement centered around a Hindu temple, in 1354, when Fa Ngum founded the kingdom of Lan Xang. Viangchan became an important administrative city, even though it was not made the capital, King Setthathirath officially established it as the capital of Lan Xang in 1563, to avoid Burmese invasion. When Lan Xang fell apart in 1707, it became an independent Kingdom of Vientiane, in 1779, it was conquered by the Siamese general Phraya Chakri and made a vassal of Siam. When King Anouvong raised a rebellion, it was obliterated by Siamese armies in 1827. The city was burned to the ground and was looted of nearly all Laotian artifacts, including Buddha statues, Viangchan was in great disrepair, depopulated and disappearing into the forest, when the French arrived. It eventually passed to French rule in 1893 and it became the capital of the French protectorate of Laos in 1899. The French rebuilt the city and rebuilt or repaired Buddhist temples such as Pha That Luang, Haw Phra Kaew, during World War II, Viangchan fell with little resistance and was occupied by Japanese forces, under the command of Sako Masanori. On 9 March 1945 French paratroopers arrived, and reoccupied the city on 24 April 1945, as the Laotian Civil War broke out between the Royal Lao Government and the Pathet Lao, Vientiane became unstable. In August 1960, Kong Le seized the capital and insisted that Souvanna Phouma become prime minister, in mid-December, Phoumi Nosavan then seized the capital, overthrew the Phouma Government, and installed Boun Oum as prime minister. In mid-1975, Pathet Lao troops moved towards the city and Americans began evacuating the capital, on 23 August 1975, a contingent of 50 Pathet Lao women symbolically liberated the city. The next day, an Insurgency in Laos began in the jungle, with the Pathet Lao fighting factions of Hmong, Vientiane was the host of the incident-free 2009 Southeast Asian Games
17.
Luang Prabang
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The centre of the city consists of four main roads and is located on a peninsula at the confluence of the Nam Khan and Mekong River. Luang Prabang is well known for its numerous Buddhist temples and monasteries, every morning, hundreds of monks from the various monasteries walk through the streets collecting alms. The city was formerly the capital of a kingdom of the same name and it had also been known by the ancient name of Chiang Thong. It was the capital and seat of government of the Kingdom of Laos. The city is part of Luang Prabang District of Luang Prabang Province and is the capital and it lies approximately 300 km north of the capital Vientiane. Currently, the population of the city as a whole is roughly 56,000 inhabitants with the UNESCO protected site being inhabited by around 24,000, Muang Sua was the old name of Luang Prabang following its conquest in 698 CE by a Tai prince, Khun Lo. Khun Lo had been awarded the town by his father, Khun Borom, who is associated with the Lao legend of the creation of the world, Khun Lo established a dynasty whose fifteen rulers reigned over an independent Muang Sua for nearly a century. In the second half of the 8th century, Nan-chao intervened frequently in the affairs of the principalities of the middle Mekong Valley, Nan-chao princes or administrators replaced the aristocracy of Tai overlords. In the meantime, the Khmers founded an outpost at Xay Fong near Vientiane, chanthaphanit, the local ruler of Xay Fong, moved north to Muang Sua and was accepted peacefully as ruler after the departure of the Nan-chao administrators. Chanthaphanit and his son had long reigns, during which the became known by the Tai name Xieng Dong Xieng Thong. The dynasty eventually became involved in the squabbles of a number of principalities, Khun Chuang, a warlike ruler who may have been a Kammu tribesman, extended his territory as a result of the warring of these principalities and ruled from 1128 to 1170. Khun Chuang, a single family ruled over a far-flung territory, at some point, Theravada Buddhism was subsumed by Mahayana Buddhism. Xieng Dong Xieng Thong experienced a period of Khmer suzerainty under Jayavarman VII from 1185 to 1191. By 1180 the Sipsong Panna had regained their independence from the Khmers, however, Xieng Dong Xieng Thong in 1353 became the capital of the Lan Xang kingdom. The capital name was changed to Luangphabang, where it was kept, the capital was moved in 1560 by King Setthathirath I to Vientiane, which remains the capital today. In 1707, Lan Xang fell apart because of a dynastic struggle, when France annexed Laos, the French recognised Luang Prabang as the royal residence of Laos. Eventually, the ruler of Luang Prabang became synonymous with the figurehead of Laos, when Laos achieved independence, the king of Luang Prabang, Sisavang Vong, became the head of state of the Kingdom of Laos. The town was the scene of events during and in the aftermath of World War II
18.
Mekong
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The Mekong is a trans-boundary river in Southeast Asia. It is the worlds 12th-longest river and the 7th-longest in Asia and its estimated length is 4,350 km, and it drains an area of 795,000 km2, discharging 475 km3 of water annually. From the Tibetan Plateau the river runs through Chinas Yunnan Province, Myanmar, Laos, Thailand, Cambodia, in 1995, Laos, Thailand, Cambodia, and Vietnam established the Mekong River Commission to assist in the management and coordinated use of the Mekongs resources. In 1996 China and Myanmar became dialogue partners of the MRC, the extreme seasonal variations in flow and the presence of rapids and waterfalls in the Mekong make navigation difficult. Even so, the river is a trade route between western China and Southeast Asia. The English name Mekong derives from a form of Thai. In Thai and Lao, mae nam is used for any major river, as such, Thai and Lao locals often refer to it in English as the River Khong. In Khmer, Mékôngk is itself glossed as mother of water, from mé and taking kôngk as a form of kôngkea. The local names for the river include, Burmese, မဲခေါင်မြစ်, IPA, Chinese, 加果空桑贡玛曲, 扎那曲 and 扎曲 Zā Qū, upper reaches, 澜沧江, 瀾滄江 Láncāng Jiāng, middle and lower reaches, Khmer, មេគង្គ Mékôngk, ទន្លេមេគង្គ Tônlé Mékôngk, ទន្លេធំ Tônlé Thum. Tai of Sipsong Panna, น้ำแม่ของ, น้ำของ, the Mekong Basin has one of the worlds largest and most productive inland fisheries. An estimated two million tonnes of fish are landed a year, in addition to almost 500,000 tonnes of aquatic animals. Aquaculture yields about two tonnes of fish a year. Hence, the lower Mekong basin yields about 4.5 million tonnes of fish, the total economic value of the fishery is between US$3.9 and US$7 billion a year. Wild capture fisheries alone have been valued at US$2 billion a year and this value increases considerably when the multiplier effect is included, but estimates vary widely. An estimated 2.56 million tonnes of fish and other aquatic animals are consumed in the lower Mekong every year. Aquatic resources make up between 47 and 80 percent of protein in rural diets for people who live in the Lower Mekong Basin. Fish are the cheapest source of protein in the region and any decline in the fishery is likely to significantly impact nutrition. Fisheries contribute significantly to a diversified livelihood strategy for many people, particularly the poor and they provide a principal form of income for numerous people and act as a safety net and coping strategy in times of poor agricultural harvests or other difficulties
19.
Geography of Laos
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Laos is an independent republic, and a landlocked nation in Southeast Asia, northeast of Thailand, west of Vietnam. It covers 236,800 square kilometers in the center of the Southeast Asian peninsula and it is surrounded by Burma, Cambodia, the Peoples Republic of China, Thailand, and Vietnam. About seventy percent of its area is made up of mountain ranges, highlands, plateaux. Its location has made it a buffer between more powerful neighboring states, as well as a crossroads for trade and communication. Migration and international conflict have contributed to the present ethnic composition of the country, geographic coordinates, 18°00′N 105°00′E Most of the western border of Laos is demarcated by the Mekong River, which is an important artery for transportation. The Dong Falls at the end of the country prevent access to the sea. Smaller power boats and pirogues provide an important means of transportation on many of the tributaries of the Mekong, also, many Laotians living in the Mekong Valley have relatives and friends in Thailand. Prior to the century, Laotian kingdoms and principalities encompassed areas on both sides of the Mekong, and Thai control in the late nineteenth century extended to the left bank. Thus, ethnic minority populations are found on both the Laotian and Vietnamese sides of the frontier, because of their relative isolation, contact between these groups and lowland Lao has been mostly confined to trading. In the north, the country is bounded by a mountainous 423-kilometre border with China, elevations are typically above 500 metres with narrow river valleys and low agricultural potential. This mountainous landscape extends across most of the north of the country, except for the plain of Vientiane, the southern panhandle of the country contains large level areas in Savannakhét and Champasak provinces that are well suited for extensive paddy rice cultivation and livestock raising. Much of Khammouan Province and the part of all the southern provinces are mountainous. Together, the plains and terraces of the Mekong and its tributaries cover only about 20% of the land area. Only about 4% of the land area is classified as arable. The forested land area has declined significantly since the 1970s as a result of logging and expanded swidden, or slash-and-burn. Generally, monsoons occur at the time across the country. Rainfall varies regionally, with the highest amounts—3,700 millimeters annually—recorded on the Bolovens Plateau in Champasak Province. City rainfall stations have recorded that Savannakhét averages 1,440 millimeters of rain annually, Vientiane receives about 1,700 millimeters, such droughts often are regional, leaving production in other parts of the country unaffected
20.
Deforestation in Laos
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Deforestation in Laos is a major environmental concern, with Laos losing forest area to legal and illegal logging. Timber products targeted for logging in Laos includes ironwood, mahogany, pine, redwood, and teak—and other forestry products—benzoin, charcoal, slash-and-burn agriculture was practiced by approximately 1 million farmers in 1990. Government efforts to preserve valuable hardwoods for commercial extraction have led to measures to prohibit slash-and-burn agriculture throughout the country, timber resources have been commercially exploited on a small scale since the colonial period and are an important source of foreign exchange. In 1988 wood products accounted for more than one-half of all export earnings, in 1992 timber and wood products were almost one-third of the total principal exports. In the 1950s, forests covered 70 percent of the area in Laos. By 1992, according to government estimates, forest coverage had decreased by nearly one-third, deforestation increased steadily throughout the 1980s, at an annual average rate of about 1.2 percent in the first half of the decade according to the United Nations and other monitoring agencies. This rate represents the destruction of about 150,000 to 160,000 hectares annually, the government, however, reported a deforestation rate double this figure. Deforestation results from clearing forestland for shifting cultivation and removing logs for industrial uses, the volume of logs removed for industrial purposes increased by about 70 percent between 1975–77 and 1985–87, to about 330,000 cubic meters. However, this volume was dwarfed by that removed for domestic purposes. Between 1980 and 1989, the volume of logs removed for fuel increased by about 25 percent, to about 3.7 million cubic meters, by 1991 these figures had increased to approximately 3.9 million cubic meters and 106,000 cubic meters, respectively. Following the introduction of the New Economic Mechanism, decentralization of forest management to autonomous forest enterprises at the provincial level encouraged increased exploitation of forests, at the central and provincial levels, autonomous forest enterprises are responsible for forest management. The government moved to reconcile its opposing objectives of decentralized forestry management, in January 1989, the government imposed a ban on logging—initially announced in January 1988 as a ban on the export of unprocessed wood—although exemptions are granted on a case-by-case basis. This measure was followed by the imposition of high taxes on timber and other wood products. Toward the end of 1989, logging was permitted. In response to the restrictions, production of unprocessed logs, both roundwood or timber decreased slightly in 1989, however, according to the Asian Development Bank, production more than recovered the following year. The effect of the restrictions is most clearly shown in the statistics for 1989—exports of timber. In 1991 a new decree banned all logging until further notice, in hopes of controlling widespread illegal logging, however, there was little practical impact, and illegal logging remains widespread. The smuggling of logs to Thailand also is significant, the area of the Luang Prabang Range, at the border between Laos and Thailand, is allegedly a heartland for military involvement in timber trade
21.
Slash-and-burn
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Slash-and-burn agriculture, or fire–fallow cultivation, is a farming method that involves the cutting and burning of plants in a forest or woodland to create a field called a swidden. In subsistence agriculture, slash-and-burn typically uses little technology and it is often applied in shifting cultivation agriculture and in transhumance livestock herding. Slash-and-burn is used by 200–500 million people worldwide, in 2004 it was estimated that in Brazil alone,500,000 small farmers each cleared an average of one hectare of forest per year. The technique is not scalable or sustainable for large human populations, methods such as Inga alley farming have been proposed as alternatives which would cause less environmental degradation. Historically, slash-and-burn cultivation has been practiced throughout much of the world and this happened in the river valleys of Egypt and Mesopotamia. Due to this decrease in food hunting, as human populations increased. Some groups could easily plant their crops in fields along river valleys. In this context, humans used slash-and-burn agriculture to more land to make it suitable for plants. Thus, since Neolithic times, slash-and-burn techniques have been used for converting forests into crop fields. Fire was used before the Neolithic as well, and by hunter-gatherers up to present times, clearings created by fire were made for many reasons, such as to draw game animals and to promote certain kinds of edible plants such as berries. Slash-and-burn fields are used and owned by a family until the soil is exhausted. At this point the ownership rights are abandoned, the family clears a new field, after a few decades, another family or clan may then use the land and claim usufructuary rights. In such a system there is no market in farmland, so land is not bought or sold in the open market. In slash-and-burn agriculture, forests are typically cut months before a dry season, the slash is permitted to dry, and then burned in the following dry season. The resulting ash fertilizes the soil and the field is then planted at the beginning of the next rainy season with crops such as upland rice, maize, cassava. Most of this work is typically done by hand, using basic tools as machetes, axes, hoes. Large families or clans wandering in the lush woodlands long continued to be the most common form of life through human prehistory, axes to fell trees and sickles for harvesting grain were the only tools people might bring with them. All other tools were made from materials found at the site, such as fire stakes of birch, long rods
22.
Timber
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Lumber, or timber is wood that has been processed into beams and planks, a stage in the process of wood production. Lumber may also refer to currently un-needed furniture, as in Lumber room, or an awkward gait, ultimately derived from the look of unfashionable, Lumber may be supplied either rough-sawn, or surfaced on one or more of its faces. Besides pulpwood, rough lumber is the raw material for furniture-making and it is available in many species, usually hardwoods, but it is also readily available in softwoods, such as white pine and red pine, because of their low cost. Lumber is mainly used for structural purposes but has other uses as well. It is classified more commonly as a softwood than as a hardwood, in Australia, Ireland, New Zealand and Britain, the term timber describes sawn wood products, such as floor boards. In the United States and Canada, generally timber describes standing or felled trees, before they are milled into boards, Timber there also describes sawn lumber not less than 5 inches in its smallest dimension. The latter includes the often partly finished lumber used in timber-frame construction, remanufactured lumber is the result of secondary or tertiary processing/cutting of previously milled lumber. Specifically, it is cut for industrial or wood-packaging use. Lumber is cut by ripsaw or resaw to create dimensions that are not usually processed by a primary sawmill, resawing is the splitting of 1-inch through 12-inch hardwood or softwood lumber into two or more thinner pieces of full-length boards. For example, splitting a ten-foot 2×4 into two ten-foot 1×4s is considered resawing, structural lumber may also be produced from recycled plastic and new plastic stock. Its introduction has been opposed by the forestry industry. Blending fiberglass in plastic lumber enhances its strength, durability, logs are converted into timber by being sawn, hewn, or split. Sawing with a rip saw is the most common method, because sawing allows logs of lower quality, with grain and large knots. There are various types of sawing, Plain sawn —A log sawn through without adjusting the position of the log, quarter sawn and rift sawn—These terms have been confused in history but generally mean lumber sawn so the annual rings are reasonably perpendicular to the sides of the lumber. Boxed heart—The pith remains within the piece with some allowance for exposure, heart center—the center core of a log. Free of heart center —A side-cut timber without any pith, free of knots —No knots are present. Dimensional lumber is lumber that is cut to standardized width and depth, carpenters extensively use dimensional lumber in framing wooden buildings. Common sizes include 2×4, 2×6, and 4×4, the length of a board is usually specified separately from the width and depth
23.
Hydropower
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Hydropower or water power is power derived from the energy of falling water or fast running water, which may be harnessed for useful purposes. A trompe, which compressed air from falling water, is sometimes used to power other machinery at a distance. In the late 19th century, hydropower became a source for generating electricity, cragside in Northumberland was the first house powered by hydroelectricity in 1878 and the first commercial hydroelectric power plant was built at Niagara Falls in 1879. In 1881, street lamps in the city of Niagara Falls were powered by hydropower, since the early 20th century, the term has been used almost exclusively in conjunction with the modern development of hydroelectric power. In China and the rest of the Far East, hydraulically operated pot wheel pumps raised water into crop or irrigation canals, the power of a wave of water released from a tank was used for extraction of metal ores in a method known as hushing. The method was first used at the Dolaucothi Gold Mines in Wales from 75 AD onwards, hushing was also widely used in Britain in the Medieval and later periods to extract lead and tin ores. It later evolved into hydraulic mining when used during the California Gold Rush and these include an endless belt with jugs attached, a cow-powered shadoof, and a reciprocating device with hinged valves. In 1753, French engineer Bernard Forest de Bélidor published Architecture Hydraulique which described vertical-, the growing demand for the Industrial Revolution would drive development as well. At the beginning of the Industrial Revolution in Britain, water was the source of power for new inventions such as Richard Arkwrights water frame. In the 1830s, at the peak in US canal-building, hydropower provided the energy to transport barge traffic up. Technological advances had moved the water wheel into an enclosed turbine or water motor. Francis, while working as engineer of Lowells Locks and Canals company. He applied scientific principles and testing methods to the problem of turbine design and his mathematical and graphical calculation methods allowed confident design of high efficiency turbines to exactly match a sites specific flow conditions. The Francis reaction turbine is still in use today. Hydraulic power networks used pipes to carrying pressurized water and transmit power from the source to end users. The power source was normally a head of water, which could also be assisted by a pump and these were extensive in Victorian cities in the United Kingdom. A hydraulic power network was developed in Geneva, Switzerland. The world-famous Jet dEau was originally designed as the relief valve for the network
24.
Gypsum
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Gypsum is a soft sulfate mineral composed of calcium sulfate dihydrate, with the chemical formula CaSO4·2H2O. It is widely mined and is used as a fertilizer, and as the constituent in many forms of plaster, blackboard chalk. Mohs scale of hardness, based on scratch Hardness comparison. It forms as a mineral and as a hydration product of anhydrite. The word gypsum is derived from the Greek word γύψος, plaster, because the quarries of the Montmartre district of Paris have long furnished burnt gypsum used for various purposes, this dehydrated gypsum became known as plaster of Paris. Upon addition of water, after a few tens of minutes plaster of Paris becomes regular gypsum again, causing the material to harden or set in ways that are useful for casting, Gypsum was known in Old English as spærstān, spear stone, referring to its crystalline projections. Gypsum may act as a source of sulfur for plant growth, which was discovered by J. M. Mayer, american farmers were so anxious to acquire it that a lively smuggling trade with Nova Scotia evolved, resulting in the so-called Plaster War of 1820. In the 19th century, it was known as lime sulfate or sulfate of lime. Gypsum is moderately water-soluble and, in contrast to most other salts, it exhibits retrograde solubility, when gypsum is heated in air it loses water and converts first to calcium sulfate hemihydrate, and, if heated further, to anhydrous calcium sulfate. As for anhydrite, its solubility in saline solutions and in brines is also dependent on NaCl concentration. Gypsum crystals are found to contain water and hydrogen bonding. Gypsum occurs in nature as flattened and often twinned crystals, and transparent, selenite contains no significant selenium, rather, both substances were named for the ancient Greek word for the Moon. Selenite may also occur in a silky, fibrous form, in case it is commonly called satin spar. Finally, it may also be granular or quite compact, in hand-sized samples, it can be anywhere from transparent to opaque. A very fine-grained white or lightly tinted variety of gypsum, called alabaster, is prized for ornamental work of various sorts, in arid areas, gypsum can occur in a flower-like form, typically opaque, with embedded sand grains called desert rose. It also forms some of the largest crystals found in nature, up to 12 m long, Gypsum is a common mineral, with thick and extensive evaporite beds in association with sedimentary rocks. Deposits are known to occur in strata from as far back as the Archaean eon, Gypsum is deposited from lake and sea water, as well as in hot springs, from volcanic vapors, and sulfate solutions in veins. Hydrothermal anhydrite in veins is commonly hydrated to gypsum by groundwater in near-surface exposures and it is often associated with the minerals halite and sulfur
25.
Tin
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Tin is a chemical element with symbol Sn and atomic number 50. It is a metal in group 14 of the periodic table. It is obtained chiefly from the mineral cassiterite, which contains tin dioxide, Tin shows a chemical similarity to both of its neighbors in group 14, germanium and lead, and has two main oxidation states, +2 and the slightly more stable +4. Tin is the 49th most abundant element and has, with 10 stable isotopes, metallic tin is not easily oxidized in air. The first alloy used on a scale was bronze, made of tin and copper. After 600 BC, pure metallic tin was produced, pewter, which is an alloy of 85–90% tin with the remainder commonly consisting of copper, antimony, and lead, was used for flatware from the Bronze Age until the 20th century. In modern times, tin is used in alloys, most notably tin/lead soft solders. Another large application for tin is corrosion-resistant tin plating of steel, inorganic tin compounds are rather non-toxic. Because of its low toxicity, tin-plated metal was used for packaging as tin cans. However, overexposure to tin may cause problems with metabolizing essential trace elements such as copper and zinc, Tin is a soft, malleable, ductile and highly crystalline silvery-white metal. When a bar of tin is bent, a sound known as the tin cry can be heard from the twinning of the crystals. Tin melts at the low temperature of about 232 °C, the lowest in group 14, the melting point is further lowered to 177.3 °C for 11 nm particles. β-tin, which is stable at and above room temperature, is malleable, in contrast, α-tin, which is stable below 13.2 °C, is brittle. α-tin has a cubic crystal structure, similar to diamond. α-tin has no properties at all because its atoms form a covalent structure in which electrons cannot move freely. It is a dull-gray powdery material with no common uses other than a few specialized semiconductor applications and these two allotropes, α-tin and β-tin, are more commonly known as gray tin and white tin, respectively. Two more allotropes, γ and σ, exist at temperatures above 161 °C, in cold conditions, β-tin tends to transform spontaneously into α-tin, a phenomenon known as tin pest. Commercial grades of tin resist transformation because of the effect of the small amounts of bismuth, antimony, lead
26.
Gold
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Gold is a chemical element with symbol Au and atomic number 79. In its purest form, it is a bright, slightly yellow, dense, soft, malleable. Chemically, gold is a metal and a group 11 element. It is one of the least reactive chemical elements and is solid under standard conditions, Gold often occurs in free elemental form, as nuggets or grains, in rocks, in veins, and in alluvial deposits. It occurs in a solid solution series with the element silver and also naturally alloyed with copper. Less commonly, it occurs in minerals as gold compounds, often with tellurium, golds atomic number of 79 makes it one of the higher numbered, naturally occurring elements. It is thought to have produced in supernova nucleosynthesis, from the collision of neutron stars. Because the Earth was molten when it was formed, almost all of the present in the early Earth probably sank into the planetary core. Gold is resistant to most acids, though it does dissolve in aqua regia, a mixture of acid and hydrochloric acid. Gold also dissolves in solutions of cyanide, which are used in mining and electroplating. Gold dissolves in mercury, forming amalgam alloys, but this is not a chemical reaction, as a precious metal, gold has been used for coinage, jewelry, and other arts throughout recorded history. A total of 186,700 tonnes of gold is in existence above ground, the world consumption of new gold produced is about 50% in jewelry, 40% in investments, and 10% in industry. Gold is also used in infrared shielding, colored-glass production, gold leafing, certain gold salts are still used as anti-inflammatories in medicine. As of 2014, the worlds largest gold producer by far was China with 450 tonnes, Gold is cognate with similar words in many Germanic languages, deriving via Proto-Germanic *gulþą from Proto-Indo-European *ǵʰelh₃-. The symbol Au is from the Latin, aurum, the Latin word for gold, the Proto-Indo-European ancestor of aurum was *h₂é-h₂us-o-, meaning glow. This word is derived from the root as *h₂éu̯sōs, the ancestor of the Latin word Aurora. This etymological relationship is presumably behind the frequent claim in scientific publications that aurum meant shining dawn, Gold is the most malleable of all metals, a single gram can be beaten into a sheet of 1 square meter, and an avoirdupois ounce into 300 square feet. Gold leaf can be thin enough to become semi-transparent
27.
Gemstones
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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
28.
Minnesota
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Minnesota is a state in the midwestern and northern regions of the United States. Minnesota was admitted as the 32nd U. S. state on May 11,1858, the state has a large number of lakes, and is known by the slogan Land of 10,000 Lakes. Its official motto is LÉtoile du Nord, Minnesota is the 12th largest in area and the 21st most populous of the U. S. Minnesota is known for its progressive political orientation and its high rate of civic participation and voter turnout. Until European settlement, Minnesota was inhabited by the Dakota and Ojibwe/Anishinaabe, in recent decades, immigration from Asia, the Horn of Africa, and Latin America has broadened its historic demographic and cultural composition. Minnesotas standard of living index is among the highest in the United States, Native Americans demonstrated the name to early settlers by dropping milk into water and calling it mnisota. Many places in the state have similar names, such as Minnehaha Falls, Minneiska, Minneota, Minnetonka, Minnetrista, and Minneapolis, a combination of mni and polis, Minnesota is the second northernmost U. S. state. Its isolated Northwest Angle in Lake of the Woods county is the part of the 48 contiguous states lying north of the 49th parallel. The state is part of the U. S. region known as the Upper Midwest and it shares a Lake Superior water border with Michigan and a land and water border with Wisconsin to the east. Iowa is to the south, North Dakota and South Dakota are to the west, with 86,943 square miles, or approximately 2.25 percent of the United States, Minnesota is the 12th-largest state. Minnesota has some of the Earths oldest rocks, gneisses that are about 3.6 billion years old. About 2.7 billion years ago, basaltic lava poured out of cracks in the floor of the primordial ocean, the roots of these volcanic mountains and the action of Precambrian seas formed the Iron Range of northern Minnesota. Following a period of volcanism 1, in more recent times, massive ice sheets at least one kilometer thick ravaged the landscape of the state and sculpted its terrain. The Wisconsin glaciation left 12,000 years ago and these glaciers covered all of Minnesota except the far southeast, an area characterized by steep hills and streams that cut into the bedrock. This area is known as the Driftless Zone for its absence of glacial drift, much of the remainder of the state outside the northeast has 50 feet or more of glacial till left behind as the last glaciers retreated. Gigantic Lake Agassiz formed in the northwest 13,000 years ago and its bed created the fertile Red River valley, and its outflow, glacial River Warren, carved the valley of the Minnesota River and the Upper Mississippi downstream from Fort Snelling. Minnesota is geologically quiet today, it experiences earthquakes infrequently, the states high point is Eagle Mountain at 2,301 feet, which is only 13 miles away from the low of 601 feet at the shore of Lake Superior. Notwithstanding dramatic local differences in elevation, much of the state is a rolling peneplain. Two major drainage divides meet in Minnesotas northeast in rural Hibbing, forming a triple watershed, precipitation can follow the Mississippi River south to the Gulf of Mexico, the Saint Lawrence Seaway east to the Atlantic Ocean, or the Hudson Bay watershed to the Arctic Ocean
29.
Yukon
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Yukon is the smallest and westernmost of Canadas three federal territories. The territory has the smallest population of any province or territory in Canada, Whitehorse is the territorial capital and Yukons only city. The territory was split from the Northwest Territories in 1898 and was named the Yukon Territory, though officially bilingual, the Yukon Government also recognizes First Nations languages. At 5,959 m, Yukons Mount Logan, in Kluane National Park and Reserve, is the highest mountain in Canada, most of Yukon has a subarctic climate, characterized by long cold winters and brief warm summers. The Arctic Ocean coast has a tundra climate, notable rivers include the Yukon River, after which the territory was named, as well as the Pelly, Stewart, Peel, White and Tatshenshini rivers. Long before the arrival of Europeans, central and southern Yukon was populated by First Nations people, sites of archeological significance in Yukon hold some of the earliest evidence of the presence of human occupation in North America. The sites safeguard the history of the first people and the earliest First Nations of the Yukon, the volcanic eruption of Mount Churchill in approximately 800 AD in what is now the U. S. Coastal and inland First Nations had extensive trading networks, European incursions into the area only began early in the 19th century with the fur trade, followed by missionaries. By the 1870s and 1880s gold miners began to arrive and this drove a population increase that justified the establishment of a police force, just in time for the start of the Klondike Gold Rush in 1897. The increased population coming with the gold led to the separation of the Yukon district from the Northwest Territories. Its northern coast is on the Beaufort Sea and its ragged eastern boundary mostly follows the divide between the Yukon Basin and the Mackenzie River drainage basin to the east in the Mackenzie mountains. Most of the territory is in the watershed of its namesake, the southern Yukon is dotted with a large number of large, long and narrow glacier-fed alpine lakes, most of which flow into the Yukon River system. The larger lakes include Teslin Lake, Atlin Lake, Tagish Lake, Marsh Lake, Lake Laberge, Kusawa Lake, bennett Lake on the Klondike Gold Rush trail is a lake flowing into Nares Lake, with the greater part of its area within Yukon. Canadas highest point, Mount Logan, is in the territorys southwest, Mount Logan and a large part of the Yukons southwest are in Kluane National Park and Reserve, a UNESCO World Heritage Site. Other national parks include Ivvavik National Park and Vuntut National Park in the north, other watersheds include the Mackenzie River, the Peel Watershed and the Alsek–Tatshenshini, and a number of rivers flowing directly into the Beaufort Sea. The two main Yukon rivers flowing into the Mackenzie in the Northwest Territories are the Liard River in the southeast, notable widespread tree species within Yukon are the black spruce and white spruce. Many trees are stunted because of the growing season and severe climate. The capital, Whitehorse, is also the largest city, with about three-quarters of the population, the second largest is Dawson City, which was the capital until 1952
30.
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
31.
MODIS
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The instruments capture data in 36 spectral bands ranging in wavelength from 0.4 µm to 14.4 µm and at varying spatial resolutions. Together the instruments image the entire Earth every 1 to 2 days, MODIS has used the marine optical buoy for vicarious calibration. MODIS is succeeded by the VIIRS instrument on board the Suomi NPP satellite launched in 2011, the MODIS characterization support team is dedicated to the production of high-quality MODIS calibrated product which is a precursor to every geophysical science product. A detailed description of the MCST mission statement and other details can be found at MCST Web, with its low spatial resolution but high temporal resolution, MODIS data is useful to track changes in the landscape over time. The United States Forest Services Remote Sensing Applications Center analyzes MODIS imagery on a basis to provide information for the management. The following MODIS Level 3 datasets are available from NASA, as processed by the Collection 5 software, most of the data is available in the HDF-EOS format — a variant of Hierarchical Data Format prescribed for the data derived from Earth Observing System missions. Imaging spectroscopy NASA World Wind Official NASA site MODIS bands and spectral ranges MODIS Images of the Day MODIS Image of the Day – Google Gadget referring to MODIS image of the day
32.
Flood
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A flood is an overflow of water that submerges land which is usually dry. The European Union Floods Directive defines a flood as a covering by water of land not normally covered by water, in the sense of flowing water, the word may also be applied to the inflow of the tide. Floods can also occur in rivers when the flow exceeds the capacity of the river channel. Floods often cause damage to homes and businesses if they are in the flood plains of rivers. Some floods develop slowly, while others such as floods, can develop in just a few minutes. Additionally, floods can be local, impacting a neighborhood or community, or very large, the word flood comes from the Old English flod, a word common to Germanic languages. Deluge myths are stories of a great flood sent by a deity or deities to destroy civilization as an act of divine retribution. Floods can happen on flat or low-lying areas when water is supplied by rainfall or snowmelt more rapidly than it can infiltrate or run off. The excess accumulates in place, sometimes to hazardous depths, surface soil can become saturated, which effectively stops infiltration, where the water table is shallow, such as a floodplain, or from intense rain from one or a series of storms. Infiltration also is slow to negligible through frozen ground, rock, concrete, paving, areal flooding begins in flat areas like floodplains and in local depressions not connected to a stream channel, because the velocity of overland flow depends on the surface slope. Endorheic basins may experience flooding during periods when precipitation exceeds evaporation. Floods occur in all types of river and stream channels, from the smallest ephemeral streams in humid zones to normally-dry channels in arid climates to the worlds largest rivers. When overland flow occurs on tilled fields, it can result in a flood where sediments are picked up by run off. Localized flooding may be caused or exacerbated by drainage obstructions such as landslides, ice, debris, slow-rising floods most commonly occur in large rivers with large catchment areas. The increase in flow may be the result of sustained rainfall, rapid snow melt, monsoons, the cause may be localized convective precipitation or sudden release from an upstream impoundment created behind a dam, landslide, or glacier. In one instance, a flood killed eight people enjoying the water on a Sunday afternoon at a popular waterfall in a narrow canyon. Without any observed rainfall, the rate increased from about 50 to 1,500 cubic feet per second in just one minute. Two larger floods occurred at the site within a week
33.
Drought
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A drought is a period of below-average precipitation in a given region, resulting in prolonged shortages in its water supply, whether atmospheric, surface water or ground water. A drought can last for months or years, or may be declared after as few as 15 days and it can have a substantial impact on the ecosystem and agriculture of the affected region and harm to the local economy. Annual dry seasons in the tropics significantly increase the chances of a drought developing, periods of heat can significantly worsen drought conditions by hastening evaporation of water vapour. Many plant species, such as those in the family Cactaceae, have drought tolerance adaptations like reduced leaf area, some others survive dry periods as buried seeds. Semi-permanent drought produces arid biomes such as deserts and grasslands, prolonged droughts have caused mass migrations and humanitarian crises. Most arid ecosystems have inherently low productivity, the most prolonged drought ever in the world in recorded history occurred in the Atacama Desert in Chile. Mechanisms of producing precipitation include convective, stratiform, and orographic rainfall, precipitation can be divided into three categories, based on whether it falls as liquid water, liquid water that freezes on contact with the surface, or ice. Drought are mainly course by in low rain areas, if these factors do not support precipitation volumes sufficient to reach the surface over a sufficient time, the result is a drought. Once a region is within drought, feedback mechanisms such as local arid air, hot conditions which can promote warm core ridging, within the tropics, distinct, wet and dry seasons emerge due to the movement of the Intertropical Convergence Zone or Monsoon trough. The dry season greatly increases drought occurrence, and is characterized by its low humidity, with watering holes, because of the lack of these watering holes, many grazing animals are forced to migrate due to the lack of water and feed to more fertile spots. Examples of such animals are zebras, elephants, and wildebeest, because of the lack of water in the plants, bushfires are common. Since water vapor becomes more energetic with increasing temperature, more water vapor is required to increase relative humidity values to 100% at higher temperatures, periods of warmth quicken the pace of fruit and vegetable production, increase evaporation and transpiration from plants, and worsen drought conditions. Drier and hotter weather occurs in parts of the Amazon River Basin, Colombia, winters during the El Niño are warmer and drier than average conditions in the Northwest, northern Midwest, and northern Mideast United States, so those regions experience reduced snowfalls. Conditions are also drier than normal from December to February in south-central Africa, mainly in Zambia, Zimbabwe, Mozambique, and Botswana. Direct effects of El Niño resulting in drier conditions occur in parts of Southeast Asia and Northern Australia, increasing bush fires, worsening haze, drier-than-normal conditions are also in general observed in Queensland, inland Victoria, inland New South Wales, and eastern Tasmania from June to August. As warm water spreads from the west Pacific and the Indian Ocean to the east Pacific, it causes extensive drought in the western Pacific. Singapore experienced the driest February in 2014 since records began in 1869, with only 6.3 mm of rain falling in the month, the years 1968 and 2005 had the next driest Februaries, when 8.4 mm of rain fell. Human activity can directly trigger exacerbating factors such as farming, excessive irrigation, deforestation
34.
Blight
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Blight refers to a specific symptom affecting plants in response to infection by a pathogenic organism. It is a rapid and complete chlorosis, browning, then death of plant tissues such as leaves, branches, twigs, accordingly, many diseases that primarily exhibit this symptom are called blights. Chestnut blight, caused by the fungus Cryphonectria parasitica Barr, has completely eradicated mature American chestnuts in North America. Fire blight of pome fruits, caused by the bacterium Erwinia amylovora Winslow et al. is the most severe disease of pear and also is found in apple and raspberry, bacterial leaf blight of rice, caused by the bacterium Xanthomonas oryzae Dowson. However, leaf spot may, in advanced stages, expand to kill entire areas of leaf tissue, media related to Blight at Wikimedia Commons The dictionary definition of blight at Wiktionary
35.
Earthquake
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An earthquake is the shaking of the surface of the Earth, resulting from the sudden release of energy in the Earths lithosphere that creates seismic waves. Earthquakes can range in size from those that are so weak that they cannot be felt to those violent enough to people around. The seismicity or seismic activity of an area refers to the frequency, type, Earthquakes are measured using measurements from seismometers. The moment magnitude is the most common scale on which earthquakes larger than approximately 5 are reported for the entire globe and these two scales are numerically similar over their range of validity. Magnitude 3 or lower earthquakes are mostly imperceptible or weak and magnitude 7 and over potentially cause damage over larger areas. The largest earthquakes in historic times have been of magnitude slightly over 9, intensity of shaking is measured on the modified Mercalli scale. The shallower an earthquake, the damage to structures it causes. At the Earths surface, earthquakes manifest themselves by shaking and sometimes displacement of the ground, when the epicenter of a large earthquake is located offshore, the seabed may be displaced sufficiently to cause a tsunami. Earthquakes can also trigger landslides, and occasionally volcanic activity, in its most general sense, the word earthquake is used to describe any seismic event — whether natural or caused by humans — that generates seismic waves. Earthquakes are caused mostly by rupture of faults, but also by other events such as volcanic activity, landslides, mine blasts. An earthquakes point of rupture is called its focus or hypocenter. The epicenter is the point at ground level directly above the hypocenter, tectonic earthquakes occur anywhere in the earth where there is sufficient stored elastic strain energy to drive fracture propagation along a fault plane. The sides of a fault move past each other smoothly and aseismically only if there are no irregularities or asperities along the surface that increase the frictional resistance. Most fault surfaces do have such asperities and this leads to a form of stick-slip behavior, once the fault has locked, continued relative motion between the plates leads to increasing stress and therefore, stored strain energy in the volume around the fault surface. This continues until the stress has risen sufficiently to break through the asperity, suddenly allowing sliding over the portion of the fault. This energy is released as a combination of radiated elastic strain seismic waves, frictional heating of the fault surface and this process of gradual build-up of strain and stress punctuated by occasional sudden earthquake failure is referred to as the elastic-rebound theory. It is estimated that only 10 percent or less of a total energy is radiated as seismic energy. Most of the energy is used to power the earthquake fracture growth or is converted into heat generated by friction
36.
Unexploded ordnance
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Unexploded ordnance from at least as far back as the American Civil War still poses a hazard worldwide, both in current and former combat areas and on military firing ranges. There are countless examples of people tampering with unexploded ordnance that is many years old – often with fatal results, believing it to be harmless they handle the device and it explodes, killing or severely injuring them. For this reason it is recommended that unexploded ordnance should not be touched or handled by unqualified persons. Instead, the location should be reported to the police so that bomb disposal or Explosive Ordnance Disposal professionals can render it safe. German EOD experts were notified and attended the scene, whilst residents living nearby were being evacuated and the EOD personnel were preparing to disarm the bomb, it detonated, killing three of them and severely injuring 6 others. The dead and injured each had over 20 years of hands-on experience, in November 2013, four US Marines were killed by an explosion whilst clearing unexploded ordnance from a firing range at Camp Pendleton. A dramatic example of MEC threat is the wreck of the SS Richard Montgomery off the coast of Kent, when a similar World War II wreck, the Polish Kielce exploded in 1967, it produced an earth tremor measuring 4.5 on the Richter scale. In the Ardennes region of France, large-scale citizen evacuations were necessary during MEC removal operations in 2001, in the forests of Verdun French government démineurs working for the Département du Déminage still hunt for poisonous, volatile, and/or explosive munitions and recover about 900 tons every year. The most feared are corroded artillery shells containing chemical agents such as mustard gas. French and Flemish farmers still find many UXOs when ploughing their fields, in Belgium, Dovo, the countrys bomb disposal unit recovers between 150 and 200 tons of unexploded bombs each year. Over 20 members of the unit have been killed since it was formed in 1919, thousands of UXOs from the Second World War are still uncovered each year in Germany. The daily average is 15, most of aerial bombs. Concentration is especially high in Berlin, where many artillery shells, while most cases only make local news, one of the more spectacular finds in recent history was an American 500-pound aerial bomb discovered in Munich on 28 August 2012. In 2011, a 1. 8-tonne RAF bomb from the Second World War was uncovered in Koblenz on the bottom of the Rhine River after a prolonged drought. It caused the evacuation of 45,000 people from the city and was called the biggest bomb-related evacuation in Germanys post-war history. On December 20,2016 another 1. 8-tonne RAF bomb was found in the city centre of Augsburg, one of the largest individual pieces ever found was an unexploded Tallboy bomb uncovered in the Sorpe Dam in 1958. Thousands of tons of UXOs remain buried across Japan, particularly in Okinawa, from 1945 until the end of the U. S. occupation of the island in 1972, the JSDF and US military disposed of 5,500 tons of UXO. Over 30,000 UXO disposal operations have been conducted on Okinawa by the JSDF since 1972, no injuries or deaths have been reported as a result of UXO disposal, however
37.
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
38.
Soil erosion
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Soil erosion is the displacement of upper layer of soil. The erosion of soil is a naturally occurring process on all land, the agents of soil erosion are water and wind, each contributing a significant amount of soil loss each year. Soil erosion may be a process that continues relatively unnoticed. The loss of soil from farmland may be reflected in reduced crop production potential, lower water quality. While erosion is a process, human activities have increased by 10–40 times the rate at which erosion is occurring globally. Excessive erosion causes both on-site and off-site problems, on-site impacts include decreases in agricultural productivity and ecological collapse, both because of loss of the nutrient-rich upper soil layers. In some cases, the end result is desertification. Off-site effects include sedimentation of waterways and eutrophication of bodies, as well as sediment-related damage to roads. Intensive agriculture, deforestation, roads, anthropogenic climate change and urban sprawl are amongst the most significant human activities in regard to their effect on stimulating erosion, however, there are many prevention and remediation practices that can curtail or limit erosion of vulnerable soils. Rainfall, and the surface runoff which may result from rainfall, produces four types of soil erosion, splash erosion, sheet erosion, rill erosion. Splash erosion is generally seen as the first and least severe stage in the erosion process. In splash erosion, the impact of a falling raindrop creates a crater in the soil. The distance these soil particles travel can be as much as 0.6 m vertically and 1.5 m horizontally on level ground. If the soil is saturated, or if the rate is greater than the rate at which water can infiltrate into the soil. If the runoff has sufficient flow energy, it will transport loosened soil particles down the slope, sheet erosion is the transport of loosened soil particles by overland flow. Rill erosion refers to the development of small, ephemeral concentrated flow paths which function as both sediment source and sediment delivery systems for erosion on hillslopes, generally, where water erosion rates on disturbed upland areas are greatest, rills are active. Flow depths in rills are typically of the order of a few centimeters or less and this means that rills exhibit hydraulic physics very different from water flowing through the deeper, wider channels of streams and rivers. Gully erosion occurs when water accumulates and rapidly flows in narrow channels during or immediately after heavy rains or melting snow
39.
Biodiversity
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Biodiversity, a contraction of biological diversity, generally refers to the variety and variability of life on Earth. One of the most widely used definitions defines it in terms of the variability within species and it is a measure of the variety of organisms present in different ecosystems. This can refer to genetic variation, ecosystem variation, or species variation within an area, biome, terrestrial biodiversity tends to be greater near the equator, which seems to be the result of the warm climate and high primary productivity. Biodiversity is not distributed evenly on Earth, and is richest in the tropics and these tropical forest ecosystems cover less than 10 per cent of earths surface, and contain about 90 percent of the worlds species. Marine biodiversity tends to be highest along coasts in the Western Pacific, there are latitudinal gradients in species diversity. Biodiversity generally tends to cluster in hotspots, and has been increasing through time, the number and variety of plants, animals and other organisms that exist is known as biodiversity. It is a component of nature and it ensures the survival of human species by providing food, fuel, shelter, medicines. The richness of biodiversity depends on the conditions and area of the region. All species of plants taken together are known as flora and about 300,000 species of plants are known to date, all species of animals taken together are known as fauna which includes birds, mammals, fish, reptiles, insects, crustaceans, molluscs, etc. Rapid environmental changes typically cause mass extinctions, more than 99 percent of all species, amounting to over five billion species, that ever lived on Earth are estimated to be extinct. Estimates on the number of Earths current species range from 10 million to 14 million, of which about 1.2 million have been documented and over 86 percent have not yet been described. More recently, in May 2016, scientists reported that 1 trillion species are estimated to be on Earth currently with only one-thousandth of one percent described, the total amount of related DNA base pairs on Earth is estimated at 5.0 x 1037 and weighs 50 billion tonnes. In comparison, the mass of the biosphere has been estimated to be as much as 4 TtC. In July 2016, scientists reported identifying a set of 355 genes from the Last Universal Common Ancestor of all living on Earth. The age of the Earth is about 4.54 billion years old, there are microbial mat fossils found in 3.48 billion-year-old sandstone discovered in Western Australia. Other early physical evidence of a substance is graphite in 3.7 billion-year-old meta-sedimentary rocks discovered in Western Greenland. More recently, in 2015, remains of life were found in 4.1 billion-year-old rocks in Western Australia. According to one of the researchers, If life arose relatively quickly on Earth, then it could be common in the universe
40.
Kyoto Protocol
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The Kyoto Protocol was adopted in Kyoto, Japan, on 11 December 1997 and entered into force on 16 February 2005. There are currently 192 parties to the Protocol, the Protocols first commitment period started in 2008 and ended in 2012. Belarus, Kazakhstan and Ukraine have stated that they may withdraw from the Protocol or not put into force the Amendment with second round targets. Japan, New Zealand and Russia have participated in Kyotos first-round but have not taken on new targets in the commitment period. Other developed countries without second-round targets are Canada and the United States, as of July 2016,66 states have accepted the Doha Amendment, while entry into force requires the acceptances of 144 states. Of the 37 countries with binding commitments,7 have ratified, negotiations were held in the framework of the yearly UNFCCC Climate Change Conferences on measures to be taken after the second commitment period ends in 2020. This resulted in the 2015 adoption of the Paris Agreement, which is an instrument under the UNFCCC rather than an amendment of the Kyoto protocol. The view that human activities are responsible for most of the observed increase in global mean temperature since the mid-20th century is an accurate reflection of current scientific thinking. Human-induced warming of the climate is expected to continue throughout the 21st century, the Intergovernmental Panel on Climate Change have produced a range of projections of what the future increase in global mean temperature might be. The IPCCs projections are baseline projections, meaning that they assume no future efforts are made to reduce gas emissions. The IPCC projections cover the period from the beginning of the 21st century to the end of the 21st century. The likely range is a increase in global mean temperature over the 21st century of between 1.1 and 6.4 °C. The range in temperature projections partly reflects different projections of greenhouse gas emissions. Different projections contain different assumptions of social and economic development. The range also reflects uncertainty in the response of the system to past. 1992 The UN Conference on the Environment and Development is held in Rio de Janeiro and it results in the Framework Convention on Climate Change among other agreements. 1995 Parties to the UNFCCC meet in Berlin to outline specific targets on emissions,1997 In December the parties conclude the Kyoto Protocol in Kyoto, Japan, in which they agree to the broad outlines of emissions targets. 2002 Russia and Canada ratify the Kyoto Protocol to the UNFCCC bringing the treaty into effect on 16 February 2005,2011 Canada became the first signatory to announce its withdrawal from the Kyoto Protocol
41.
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
42.
Endangered Species
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An endangered species is a species which has been categorized as likely to become extinct. In 2012, the IUCN Red List featured 3079 animal and 2655 plant species as endangered worldwide, the figures for 1998 were, respectively,1102 and 1197. Many nations have laws that protect conservation-reliant species, for example, population numbers, trends and species conservation status can be found in the lists of organisms by population. The conservation status of a species indicates the likelihood that it will become extinct, the IUCN Red List of Threatened Species is the best-known worldwide conservation status listing and ranking system. Over 40% of the species are estimated to be at risk of extinction. Internationally,199 countries have signed an accord to create Biodiversity Action Plans that will protect endangered, in the United States, such plans are usually called Species Recovery Plans. Those species of Near Threatened and Least Concern status have been assessed and found to have relatively robust and healthy populations, though these may be in decline. The IUCN categories, with examples of animals classified by them, include, Extinct Extinct in the wild Captive individuals survive, critically endangered Faces an extremely high risk of extinction in the immediate future. Endangered Faces a high risk of extinction in the near future, vulnerable Faces a high risk of endangerment in the medium term. Near-threatened May be considered threatened in the near future, Least concern No immediate threat to species survival. A population size reduction of ≥ 50%, projected or suspected to be met within the next 10 years or three generations, whichever is the longer, based on any of to under A1. E) Quantitative analysis showing the probability of extinction in the wild is at least 20% within 20 years or five generations, there is data from the United States that shows a correlation between human populations and threatened and endangered species. Under the Endangered Species Act in the United States, species may be listed as endangered or threatened, the Salt Creek tiger beetle is an example of an endangered subspecies protected under the ESA. Some endangered species laws are controversial, also lobbying from hunters and various industries like the petroleum industry, construction industry, and logging, has been an obstacle in establishing endangered species laws. The Bush administration lifted a policy that required federal officials to consult an expert before taking actions that could damage endangered species. Under the Obama administration, this policy has been reinstated, being listed as an endangered species can have negative effect since it could make a species more desirable for collectors and poachers. This effect is potentially reducible, such as in China where commercially farmed turtles may be reducing some of the pressure to poach endangered species. Another problem with the species is its effect of inciting the use of the shoot, shovel
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Environmental Modification
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It opened for signature on 18 May 1977 in Geneva and entered into force on 5 October 1978. The Convention bans weather warfare, which is the use of weather modification techniques for the purposes of inducing damage or destruction, the Convention on Biological Diversity of 2010 would also ban some forms of weather modification or geoengineering. Many states do not regard this as a ban on the use of herbicides in warfare, such as Agent Orange. The Convention was signed by 48 states,16 of the signatories have not ratified, as of June 2015, the Convention has 77 state parties. The problem of artificial modification of the environment for military or other purposes was brought to the international agenda in the early 1970s. The Convention was approved by Resolution 31/72 of the General Assembly of the United Nations on 10 December 1976, the Convention contains ten articles and one Annex on the Consultative Committee of Experts. Integral part of the Convention are also the Understandings relating to articles I,27, New York, United Nations,1976, pp. 91–92. The United Nations Office at Geneva
This article incorporates public domain material from the Library of Congress Country Studies website http://lcweb2.loc.gov/frd/cs/.
This article incorporates 
