1.
Summit
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A summit is a point on a surface that is higher in elevation than all points immediately adjacent to it. Mathematically, a summit is a maximum in elevation. The topographic terms acme, apex, peak, and zenith are synonymous, the UIAA definition is that a summit is independent if it has a prominence of 30 metres or more, it is a mountain if it has a prominence of at least 300 metres. This can be summarised as follows, A pyramidal peak is an exaggerated form produced by ice erosion of a mountain top, Summit may also refer to the highest point along a line, trail, or route. In many parts of the western United States, the term refers to the highest point along a road, highway. For example, the highest point along Interstate 80 in California is referred to as Donner Summit while the highest point on Interstate 5 is Siskiyou Mountain Summit, geoid Hill List of highest mountains Maxima and minima Nadir Summit accordance Peak finder
2.
Democratic Republic of the Congo
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The Democratic Republic of the Congo, also known as DR Congo, DRC, DROC, East Congo, Congo-Kinshasa, or simply the Congo is a country located in Central Africa. From 1971 to 1997 it was named, and is still called, Zaire. It is the second-largest country in Africa by area and eleventh largest in the world, the Congolese Civil Wars, which began in 1996, brought about the end of Mobutu Sese Sekos 32-year reign and devastated the country. These wars ultimately involved nine African nations, multiple groups of UN peacekeepers and twenty armed groups, besides the capital, Kinshasa, the other major cities, Lubumbashi and Mbuji-Mayi, are both mining communities. DR Congos largest export is raw minerals, with China accepting over 50% of DRCs exports in 2012, as of 2015, according to the Human Development Index, DR Congo has a low level of human development, ranking 176 out of 187 countries. The country was known officially as the Democratic Republic of the Congo from 1965 to 27 October 1971, in 1992, the Sovereign National Conference voted to change the name of the country to the Democratic Republic of the Congo, but the change was not put into practice. The countrys name was restored by former president Laurent-Désiré Kabila following the fall of longtime dictator Mobutu Sese Seko in 1997, some historians think that Bantu peoples began settling in the extreme northwest of Central Africa at the beginning of the 5th century and then gradually started to expand southward. Their propagation was accelerated by the transition from Stone Age to Iron Age techniques, the people living in the south and southwest were mostly San Bushmen and hunter-gatherer groups, whose technology involved only minimal use of metal technologies. The development of tools during this time period revolutionized agriculture. This led to the displacement of the groups in the east and southeast. The 10th century marked the expansion of the Bantu in West-Central Africa. Rising populations soon made intricate local, regional and foreign commercial networks that traded mostly in salt, iron. Belgian exploration and administration took place from the 1870s until the 1920s and it was first led by Sir Henry Morton Stanley, who undertook his explorations under the sponsorship of King Leopold II of Belgium. The eastern regions of the precolonial Congo were heavily disrupted by constant slave raiding, mainly from Arab–Swahili slave traders such as the infamous Tippu Tip, Leopold had designs on what was to become the Congo as a colony. Leopold formally acquired rights to the Congo territory at the Conference of Berlin in 1885 and he named it the Congo Free State. Leopolds rėgime began various infrastructure projects, such as construction of the railway ran from the coast to the capital of Leopoldville. Nearly all such projects were aimed at making it easier to increase the assets which Leopold. In the Free State, colonists brutalized the local population into producing rubber, for which the spread of automobiles, rubber sales made a fortune for Leopold, who built several buildings in Brussels and Ostend to honor himself and his country
3.
Mountain range
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A mountain range is a geographic area containing numerous geologically related mountains. A mountain system or system of ranges, sometimes is used to combine several geological features that are geographically related. Mountain ranges are usually segmented by highlands or mountain passes and valleys, individual mountains within the same mountain range do not necessarily have the same geologic structure or petrology. They may be a mix of different orogenic expressions and terranes, for example thrust sheets, uplifted blocks, fold mountains, most geologically young mountain ranges on the Earths land surface are associated with either the Pacific Ring of Fire or the Alpide Belt. The Andes is 7,000 kilometres long and is considered the worlds longest mountain system. The Alpide belt includes Indonesia and southeast Asia, through the Himalaya, the belt also includes other European and Asian mountain ranges. The Himalayas contain the highest mountains in the world, including Mount Everest, mountain ranges outside of these two systems include the Arctic Cordillera, the Urals, the Appalachians, the Scandinavian Mountains, the Altai Mountains and the Hijaz Mountains. If the definition of a range is stretched to include underwater mountains. The mountain systems of the earth are characterized by a tree structure, the sub-range relationship is often expressed as a parent-child relationship. For example, the White Mountains of New Hampshire and the Blue Ridge Mountains are sub-ranges of the Appalachian Mountains, equivalently, the Appalachians are the parent of the White Mountains and Blue Ridge Mountains, and the White Mountains and the Blue Ridge Mountains are children of the Appalachians. The position of mountains influences climate, such as rain or snow, when air masses move up and over mountains, the air cools producing orographic precipitation. As the air descends on the side, it warms again and is drier. Often, a shadow will affect the leeward side of a range. Mountain ranges are constantly subjected to forces which work to tear them down. Erosion is at work while the mountains are being uplifted and long after until the mountains are reduced to low hills, rivers are traditionally believed to be the principle erosive factor on mountain ranges, with their ability of bedrock incision and sediment transport. The rugged topography of a range is the product of erosion. The basins adjacent to a mountain range are filled with sediments which are buried and turned into sedimentary rock. The early Cenozoic uplift of the Rocky Mountains of Colorado provides an example and this mass of rock was removed as the range was actively undergoing uplift
4.
Stratovolcano
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A stratovolcano, also known as a composite volcano, is a conical volcano built up by many layers of hardened lava, tephra, pumice, and volcanic ash. Unlike shield volcanoes, stratovolcanoes are characterized by a profile and periodic explosive eruptions and effusive eruptions. The lava flowing from stratovolcanoes typically cools and hardens before spreading far due to high viscosity, the magma forming this lava is often felsic, having high-to-intermediate levels of silica, with lesser amounts of less-viscous mafic magma. Extensive felsic lava flows are uncommon, but have travelled as far as 15 km, stratovolcanoes are sometimes called composite volcanoes because of their composite layered structure built up from sequential outpourings of eruptive materials. They are among the most common types of volcanoes, in contrast to the less common shield volcanoes, two famous stratovolcanoes are Krakatoa, best known for its catastrophic eruption in 1883 and Vesuvius, famous for its destruction of the towns Pompeii and Herculaneum in 79 CE. Both eruptions claimed thousands of lives, in modern times, Mount Saint Helens and Mount Pinatubo have erupted catastrophically. Existence of stratovolcanoes has not been proved on other bodies of the solar system with one exception. Their existence was suggested for some isolated massifs on Mars, e. g. Zephyria Tholus, stratovolcanoes are common at subduction zones, forming chains along plate tectonic boundaries where oceanic crust is drawn under continental crust or another oceanic plate. The release of water from hydrated minerals is termed dewatering, and occurs at pressures and temperatures for each mineral. The magma then rises through the crust, incorporating silica-rich crustal rock, when the magma nears the top surface, it pools in a magma chamber under or within the volcano. There, the low pressure allows water and other volatiles dissolved in the magma to escape from solution, as occurs when a bottle of carbonated water is opened. Once a critical volume of magma and gas accumulates, the obstacle of the cone is overcome. In recorded history, explosive eruptions at subduction zone volcanoes have posed the greatest hazard to civilizations. Subduction-zone stratovolcanoes, such as Mount St. Helens, Mount Etna and Mount Pinatubo, typically erupt with explosive force, as a consequence, the tremendous internal pressures of the trapped volcanic gases remain in the pasty magma. Following the breaching of the chamber, the magma degasses explosively. The gases and water out with speed and force. Since 1600 CE, nearly 300,000 people have killed by volcanic eruptions. Most deaths were caused by flows and mudflows, deadly hazards that often accompany explosive eruptions of subduction-zone stratovolcanoes
5.
Types of volcanic eruptions
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Several types of volcanic eruptions—during which lava, tephra, and assorted gases are expelled from a volcanic vent or fissure—have been distinguished by volcanologists. These are often named after famous volcanoes where that type of behavior has been observed, some volcanoes may exhibit only one characteristic type of eruption during a period of activity, while others may display an entire sequence of types all in one eruptive series. There are three different types of eruptions, the most well-observed are magmatic eruptions, which involve the decompression of gas within magma that propels it forward. Phreatomagmatic eruptions are another type of eruption, driven by the compression of gas within magma. Within these wide-defining eruptive types are several subtypes, the weakest are Hawaiian and submarine, then Strombolian, followed by Vulcanian and Surtseyan. The stronger eruptive types are Pelean eruptions, followed by Plinian eruptions, subglacial and phreatic eruptions are defined by their eruptive mechanism, and vary in strength. An important measure of strength is Volcanic Explosivity Index, an order of magnitude scale ranging from 0 to 8 that often correlates to eruptive types. Explosive eruptions are characterized by gas-driven explosions that propels magma and tephra, effusive eruptions, meanwhile, are characterized by the outpouring of lava without significant explosive eruption. Volcanic eruptions vary widely in strength, on the one extreme there are effusive Hawaiian eruptions, which are characterized by lava fountains and fluid lava flows, which are typically not very dangerous. On the other extreme, Plinian eruptions are large, violent, volcanoes are not bound to one eruptive style, and frequently display many different types, both passive and explosive, even the span of a single eruptive cycle. Volcanoes do not always erupt vertically from a crater near their peak. Some volcanoes exhibit lateral and fissure eruptions, notably, many Hawaiian eruptions start from rift zones, and some of the strongest Surtseyan eruptions develop along fracture zones. Scientists believed that pulses of magma mixed together in the chamber before climbing upward—a process estimated to several thousands of years. But Columbia University volcanologists found that the eruption of Costa Rica’s Irazú Volcano in 1963 was likely triggered by magma that took a route from the mantle over just a few months. The volcanic explosivity index is a scale, from 0 to 8 and it is used by the Smithsonian Institutions Global Volcanism Program in assessing the impact of historic and prehistoric lava flows. It operates in a way similar to the Richter scale for earthquakes, the vast majority of volcanic eruptions are of VEIs between 0 and 2. Volcanic eruptions by VEI index Magmatic eruptions produce juvenile clasts during explosive decompression from gas release, Hawaiian eruptions are a type of volcanic eruption, named after the Hawaiian volcanoes with which this eruptive type is hallmark. Hawaiian eruptions are the calmest types of events, characterized by the effusive eruption of very fluid basalt-type lavas with low gaseous content
6.
Virunga National Park
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The park was established in 1925 as Africas first national park and is a UNESCO-designated World Heritage Site since 1979. In recent years, poaching and the Congo Civil War have seriously damaged its wildlife population, the current park director since 2008 is the Belgian Prince Emmanuel de Merode. The park was created in 1925 by King Albert I of Belgium as the first national park on the continent of Africa. Land remuneration and the use of resources such as fishing and hunting by the local population became an ongoing problem. When the Belgians granted Congo independence in 1960 the new state deteriorated rapidly and it was only in 1969 when President Mobutu began to take a personal interest in conservation, that the park was revived. In the process of Mobutus Africanization campaign, it was renamed Virunga National Park, Virunga fared well for the better part of the 1970s. Foreign investment helped to improve the infrastructure and training facilities. In 1979 UNESCO designated the park as a World Heritage Site, in the mid-1980s the Mobutu regime began to lose its hold on power and the country began a long slide into chaos. Poaching depleted Virungas large mammal populations, infrastructure was destroyed, the Congolese Wildlife Authority slowly lost control of Virunga and UNESCO changed the World Heritage Site status to endangered. In 2013 the World Wildlife Fund raised concerns about plans by the UK based Soco International to carry out exploration for oil in the park, currently more than 80% of Virunga National Park has been allocated as oil concessions. Soco Internationals own environmental impact assessment reports admit that oil exploration is likely to cause pollution, irreparably damage habitats, the World Wildlife Fund have launched a campaign to petition Soco to refrain exploring the world heritage area for oil, and thereby avoid these outcomes. As of August 30,2014, SOCO demobilized its operations in the DRC, World Wildlife Fund executives now acknowledge that the battle over Virunga is hardly over. SOCO has yet to relinquish its operating permits or commit to an unconditional withdrawal, Virunga National Park is unrivaled in its diversity of landscapes and ecosystems. The park is known for its diversity, containing more bird, mammal. Although mountain gorillas are now rare and listed as one of the most critically endangered species. Their populations actually increased during the years of upheaval in the region. The 2010 mountain gorilla census has indicated that the efforts of Virunga have been very successful regarding the gorilla population. Both savanna and forest elephants as well as chimpanzees and low land gorillas can still be found in Virunga, along with okapi, giraffes, buffaloes and many endemic birds
7.
Goma
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Goma is a city in the eastern Democratic Republic of the Congo. It is located on the shore of Lake Kivu, next to the Rwandan city of Gisenyi. The lake and the two cities are in the Albertine Rift, the branch of the East African Rift system. Goma lies only 13 to 18 km due south of the crater of the active Nyiragongo Volcano, the recent history of Goma has been dominated by the volcano and the Rwandan Genocide of 1994, which in turn fuelled the First and Second Congo Wars. The aftermath of events was still having effects on the city. The city was captured by rebels during the M23 rebellion in late 2012, Goma is the capital of the North Kivu province, which is ethnically similar and neighboring to South Kivu, together the two provinces are known as the Kivus. The Rwandan Genocide of 1994 was perpetrated by the provisional Rwandan government on the Tutsi, population, one of the many UN missions attempted to provide a safe zone in the volatile situation and provided safe passage for the refugees, however they were French. From June 13 to July 14,1994,10,000 to 12,000 refugees per day crossed the border into Goma, the massive influx created a severe humanitarian crisis, as there was an acute lack of shelter, food and water. However the Zaïrean government took it upon themselves to garner attention for the situation, shortly after the arrival of nearly one million refugees, a deadly cholera outbreak claimed thousands of lives in the Hutu refugee camps around Goma. RPF aligned forces, manly actors in the conflict, crossed the border and they captured Bukavu and other towns, and the Second Congo War began. The Goma refugee camps, in which the Hutu had created a militia called the FDLR, were attacked by Rwandan government forces. The Second Congo War was unprecedented in Africa for the loss of life in massacres and atrocities. By 2003 the Banyamulenge had become tired of the war and friction emerged between them and Rwanda, in 2002 and 2003 a fragile negotiated peace emerged between the many sides involved in the war. There have been outbreaks of violence since 2003. The Hutu FDLR remains in the forests and mountains north and west of Goma, carrying out attacks on the Rwandan border, MONUC began airlifting Congolese troops into Goma and transferring them by helicopter from Goma International Airport to Masisi. On October 27,2008, the Battle of Goma broke out in the city between the Congolese army, supported by MONUC, and Nkundas CNDP rebels,200,000 refugees fled the town, Goma was seized by the M23 movement on November 20,2012. Tens of thousands of civilians fled the area, in January 2002, Nyiragongo erupted, sending a stream of lava 200 metres to one kilometre wide and up to two metres deep through the center of the city as far as the lake shore. Agencies monitoring the volcano were able to give a warning and most of the population of Goma evacuated to Gisenyi, the lava destroyed 40% of the city
8.
Rwanda
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Rwanda, officially the Republic of Rwanda, is a sovereign state in central and east Africa and one of the smallest countries on the African mainland. Located a few south of the Equator, Rwanda is bordered by Uganda, Tanzania, Burundi. Rwanda is in the African Great Lakes region and is elevated, its geography is dominated by mountains in the west and savanna to the east. The climate is temperate to subtropical, with two seasons and two dry seasons each year. The population is young and predominantly rural, with a density among the highest in Africa, Rwandans are drawn from just one cultural and linguistic group, the Banyarwanda, although within this group there are three subgroups, the Hutu, Tutsi and Twa. The Twa are a pygmy people descended from Rwandas earliest inhabitants. Christianity is the largest religion in the country, the language is Kinyarwanda, spoken by most Rwandans, with English. Rwanda has a system of government. The president is Paul Kagame of the Rwandan Patriotic Front, who took office in 2000, Rwanda today has low corruption compared with neighbouring countries, although human rights organisations report suppression of opposition groups, intimidation and restrictions on freedom of speech. The country has been governed by an administrative hierarchy since pre-colonial times. Rwanda is one of two countries with a female majority in the national parliament. Hunter gatherers settled the territory in the stone and iron ages, the population coalesced first into clans and then into kingdoms. The Kingdom of Rwanda dominated from the century, with the Tutsi kings conquering others militarily, centralising power. Germany colonised Rwanda in 1884 as part of German East Africa, followed by Belgium, both European nations ruled through the kings and perpetuated a pro-Tutsi policy. The Hutu population revolted in 1959 and they massacred numerous Tutsi and ultimately established an independent, Hutu-dominated state in 1962. The Tutsi-led Rwandan Patriotic Front launched a war in 1990. Social tensions erupted in the 1994 genocide, in which Hutu extremists killed an estimated 500,000 to 1.3 million Tutsi, the RPF ended the genocide with a military victory. Rwandas economy suffered heavily during the 1994 Rwandan Genocide, but has since strengthened, the economy is based mostly on subsistence agriculture
9.
Lava lake
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Lava lakes are large volumes of molten lava, usually basaltic, contained in a volcanic vent, crater, or broad depression. The term is used to describe both lava lakes that are wholly or partly molten and those that are solidified, lava lakes have been observed to exhibit a range of behaviours. A “constantly circulating, apparently steady-state” lava lake was observed during the 1969–1971 Mauna Ulu eruption of Kilauea, superimposed upon this is the effect of bubbles rising through the liquid, and coalescence of bubbles within the conduit. The interactions of these effects can create either a steady-state recirculating lake, or a level that periodically rises. Persistent lava lakes are a rare phenomenon, the lava lake at Masaya came back in January 2016. In addition to the aforementioned persistent lava lakes, a number of occurrences of temporary lava lakes have also been observed and are listed in the following table. Types of volcanic eruptions This article incorporates public domain material from the United States Geological Survey document, lava lake in Nyiragongo Volcano crater. Video on France 24 TV Into the mouth of a volcano, video footage of lava lake in Vanuatus Marum volcano
10.
Africa
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Africa is the worlds second-largest and second-most-populous continent. At about 30.3 million km² including adjacent islands, it covers 6% of Earths total surface area and 20.4 % of its land area. With 1.2 billion people as of 2016, it accounts for about 16% of the human population. The continent includes Madagascar and various archipelagos and it contains 54 fully recognized sovereign states, nine territories and two de facto independent states with limited or no recognition. Africas population is the youngest amongst all the continents, the age in 2012 was 19.7. Algeria is Africas largest country by area, and Nigeria by population, afarensis, Homo erectus, H. habilis and H. ergaster – with the earliest Homo sapiens found in Ethiopia being dated to circa 200,000 years ago. Africa straddles the equator and encompasses numerous climate areas, it is the continent to stretch from the northern temperate to southern temperate zones. Africa hosts a diversity of ethnicities, cultures and languages. In the late 19th century European countries colonized most of Africa, Africa also varies greatly with regard to environments, economics, historical ties and government systems. However, most present states in Africa originate from a process of decolonization in the 20th century, afri was a Latin name used to refer to the inhabitants of Africa, which in its widest sense referred to all lands south of the Mediterranean. This name seems to have referred to a native Libyan tribe. The name is connected with Hebrew or Phoenician ʿafar dust. The same word may be found in the name of the Banu Ifran from Algeria and Tripolitania, under Roman rule, Carthage became the capital of the province of Africa Proconsularis, which also included the coastal part of modern Libya. The Latin suffix -ica can sometimes be used to denote a land, the later Muslim kingdom of Ifriqiya, modern-day Tunisia, also preserved a form of the name. According to the Romans, Africa lay to the west of Egypt, while Asia was used to refer to Anatolia, as Europeans came to understand the real extent of the continent, the idea of Africa expanded with their knowledge. 25,4, whose descendants, he claimed, had invaded Libya, isidore of Seville in Etymologiae XIV.5.2. Suggests Africa comes from the Latin aprica, meaning sunny, massey, in 1881, stated that Africa is derived from the Egyptian af-rui-ka, meaning to turn toward the opening of the Ka. The Ka is the double of every person and the opening of the Ka refers to a womb or birthplace
11.
Lava
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Lava is the molten rock expelled by a volcano during an eruption. The resulting rock after solidification and cooling is called lava. The molten rock is formed in the interior of planets, including Earth. The source of the heat melts the rock within the earth is geothermal energy. When first erupted from a vent, lava is a liquid usually at temperatures from 700 to 1,200 °C. A lava flow is an outpouring of lava, which is created during a non-explosive effusive eruption. When it has stopped moving, lava solidifies to form igneous rock, the term lava flow is commonly shortened to lava. Although lava can be up to 100,000 times more viscous than water, lava can flow great distances before cooling and solidifying because of its thixotropic, explosive eruptions produce a mixture of volcanic ash and other fragments called tephra, rather than lava flows. The word lava comes from Italian, and is derived from the Latin word labes which means a fall or slide. The first use in connection with extruded magma was apparently in an account written by Francesco Serao on the eruption of Vesuvius between May 14 and June 4,1737. Serao described a flow of lava as an analogy to the flow of water. The composition of almost all lava of the Earths crust is dominated by silicate minerals, mostly feldspars, olivine, pyroxenes, amphiboles, micas, igneous rocks, which form lava flows when erupted, can be classified into three chemical types, felsic, intermediate, and mafic. These classes are primarily chemical, however, the chemistry of lava also tends to correlate with the temperature, its viscosity. Felsic or silicic lavas such as rhyolite and dacite typically form lava spines, most silicic lava flows are extremely viscous, and typically fragment as they extrude, producing blocky autobreccias. Felsic magmas can erupt at temperatures as low as 650 to 750 °C, unusually hot rhyolite lavas, however, may flow for distances of many tens of kilometres, such as in the Snake River Plain of the northwestern United States. Intermediate or andesitic lavas are lower in aluminium and silica, and usually somewhat richer in magnesium, intermediate lavas form andesite domes and block lavas, and may occur on steep composite volcanoes, such as in the Andes. Poorer in aluminium and silica than felsic lavas, and also commonly hotter, greater temperatures tend to destroy polymerized bonds within the magma, promoting more fluid behaviour and also a greater tendency to form phenocrysts. Higher iron and magnesium tends to manifest as a darker groundmass, mafic or basaltic lavas are typified by their high ferromagnesian content, and generally erupt at temperatures in excess of 950 °C
12.
Hawaii
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Hawaii is the 50th and most recent state to have joined the United States of America, having received statehood on August 21,1959. Hawaii is the only U. S. state located in Oceania and it is the northernmost island group in Polynesia, occupying most of an archipelago in the central Pacific Ocean. Hawaii is the only U. S. state not located in the Americas, the state encompasses nearly the entire volcanic Hawaiian archipelago, which comprises hundreds of islands spread over 1,500 miles. At the southeastern end of the archipelago, the eight main islands are—in order from northwest to southeast, Niʻihau, Kauaʻi, Oʻahu, Molokaʻi, Lānaʻi, Kahoʻolawe, Maui, and the Island of Hawaiʻi. The last is the largest island in the group, it is called the Big Island or Hawaiʻi Island to avoid confusion with the state or archipelago. The archipelago is physiographically and ethnologically part of the Polynesian subregion of Oceania, Hawaii has over a million permanent residents, along with many visitors and U. S. military personnel. Its capital is Honolulu on the island of Oʻahu, Hawaii is the 8th-smallest and the 11th-least populous, but the 13th-most densely populated of the fifty U. S. states. It is the state with an Asian plurality. The states coastline is about 750 miles long, the fourth longest in the U. S. after the coastlines of Alaska, Florida, the state of Hawaii derives its name from the name of its largest island, Hawaiʻi. A common Hawaiian explanation of the name of Hawaiʻi is that was named for Hawaiʻiloa and he is said to have discovered the islands when they were first settled. The Hawaiian language word Hawaiʻi is very similar to Proto-Polynesian *Sawaiki, cognates of Hawaiʻi are found in other Polynesian languages, including Māori, Rarotongan and Samoan. According to linguists Pukui and Elbert, lsewhere in Polynesia, Hawaiʻi or a cognate is the name of the underworld or of the home, but in Hawaii. A somewhat divisive political issue arose in 1978 when the Constitution of the State of Hawaii added Hawaiian as an official state language. The title of the constitution is The Constitution of the State of Hawaii. Article XV, Section 1 of the Constitution uses The State of Hawaii, diacritics were not used because the document, drafted in 1949, predates the use of the okina and the kahakō in modern Hawaiian orthography. The exact spelling of the name in the Hawaiian language is Hawaiʻi. In the Hawaii Admission Act that granted Hawaiian statehood, the government recognized Hawaii as the official state name. Official government publications, department and office titles, and the Seal of Hawaii use the spelling with no symbols for glottal stops or vowel length
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