Tikopia is a volcanic island in Temotu Province , in the independent nation of Solomon Islands , southwestern Pacific Ocean . Although most of Solomon Islands is Melanesian , Tikopia is culturally Polynesian . The first Europeans arrived on 22 April 1606 as part of the Spanish expedition of Pedro Fernandes de Queirós .
117-514: Covering an area of 5 square kilometres (1.9 square miles), the island is the remnant of an extinct volcano . Its highest point, Mt. Reani, reaches an elevation of 380 metres (1,250 feet) above sea level . Lake Te Roto covers an old volcanic crater which is 80 metres (260 feet) deep. Tikopia's location is relatively remote . It is sometimes grouped with the Santa Cruz Islands . Administratively, Tikopia belongs to Temotu Province as
234-471: A ghost town ) and Fourpeaked Mountain in Alaska, which, before its September 2006 eruption, had not erupted since before 8000 BCE. Coming of age Coming of age is a young person 's transition from being a child to being an adult . The specific age at which this transition takes place varies between societies, as does the nature of the change. It can be a simple legal convention or can be part of
351-886: A mid-ocean ridge , such as the Mid-Atlantic Ridge , has volcanoes caused by divergent tectonic plates whereas the Pacific Ring of Fire has volcanoes caused by convergent tectonic plates. Volcanoes can also form where there is stretching and thinning of the crust's plates, such as in the East African Rift , the Wells Gray-Clearwater volcanic field , and the Rio Grande rift in North America. Volcanism away from plate boundaries has been postulated to arise from upwelling diapirs from
468-530: A rite in Lutheranism, Anglicanism, Methodism, Irvingism, and Reformed Christianity. The Catholic and Methodist denominations teach that in confirmation, the Holy Spirit strengthens a baptized individual for their faith journey. This is usually done by a bishop or an abbot laying their hands upon the foreheads of the young person (usually between the ages of 12 and 15 years), and marking them with
585-594: A ritual or spiritual event. In the past, and in some societies today, such a change is often associated with the age of sexual maturity ( puberty ), especially menarche and spermarche . In others, it is associated with an age of religious responsibility. Particularly in Western societies, modern legal conventions stipulate points around the end of adolescence and the beginning of early adulthood (most commonly 18 though ranging from 16 to 21) when adolescents are generally no longer considered minors and are granted
702-542: A boy or girl is mature enough to understand his responsibility towards family and society. Some castes in Hinduism also have the sacred thread ceremony, called Upanayana , for Dvija (twice-born) boys that mark their coming of age to do religious ceremonies. A rite of passage males have to go through is Bhrataman (or Chudakarma) that marks adulthood. In the traditional Ifá faith of the Yoruba people of West Africa and
819-466: A coat and tie for the upper-middle and upper classes, and usually has a theme or color scheme that is related to the dress code. The débutante traditionally chooses for her entourage "18 Roses", who are 18 special men or boys in the girl's life such as boyfriends, relatives and brothers, and "18 Candles", who are the Roses' female counterparts. Each presents a rose or candle then delivers a short speech about
936-437: A graduated spectrum, with much overlap between categories, and does not always fit neatly into only one of these three separate categories. The USGS defines a volcano as "erupting" whenever the ejection of magma from any point on the volcano is visible, including visible magma still contained within the walls of the summit crater. While there is no international consensus among volcanologists on how to define an active volcano,
1053-553: A lifestyle that involves celibacy , formal voluntary poverty , absolute nonviolence , and daily fasting between noon and the following day's sunrise. Depending on how long they stay, the boys will learn various chants and recitations in the canonical language ( Pali ) – typically the Buddha's more famous discourses ( Suttas ) and verses ( Gathas ) – as well as Buddhist ethics and higher monastic discipline ( Vinaya ). If they stay long enough and conditions permit, they may be tutored in
1170-547: A man turned 20, his parents would hold a Guan Li (also named the capping ceremony); when a girl turned 15, she would receive a Ji Li (also known as the Hairpin Ceremony). These rites were considered to represent a person being mature and prepared to get married and start a family; therefore, they were the beginning of all the moral rites. During this rite of passage, the young person receives his/her style name . In Hinduism coming of age generally signifies that
1287-592: A man who has not ordained temporarily as a Samanera in this way at some point in his life. Men who have completed this Samanera ordination and have returned to lay life are considered primed for adult married life and are described in the Thai language and the Khmer language by terms which roughly translate as "cooked", "finished", or "cooled off" in English, as in meal preparation/consumption. Thus, one's monastic training
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#17327828851621404-447: A memorial of their leaving their youth. Years later, the quintos of the same year could still hold yearly meals to remember times past. By the end of the 20th century, the rural exodus , the diffusion of city customs and the loss of prestige of military service changed the relevance of quintos parties. In some places, the party included the village girls of the same age, thus becoming less directly related to military service. In others,
1521-443: A paper was published suggesting a new definition for the word 'volcano' that includes processes such as cryovolcanism . It suggested that a volcano be defined as 'an opening on a planet or moon's surface from which magma , as defined for that body, and/or magmatic gas is erupted.' This article mainly covers volcanoes on Earth. See § Volcanoes on other celestial bodies and cryovolcano for more information. The word volcano
1638-513: A perpetual state of innocence. In 1910, Pope Pius X issued the decree Quam singulari , which changed the age of eligibility for receiving both the sacrament of Penance and the Eucharist to a "time when a child begins to reason, that is about the seventh year, more or less." Previously, local standards had been at least 10 or 12 or even 14 years old. Historically, the sacrament of confirmation has been administered to youth who have reached
1755-415: A success case in matching the challenges of sustainability, contrasting it with Easter Island . In 2009 a double canoe closely following the original design of the traditional Tikopia canoes was donated to the island, as well as to Tikopia's sister island Anuta, in order to give the islands their own independent sea transport. This canoe called 'Lapita Tikopia' and its sistership 'Lapita Anuta' were built in
1872-632: A volcano is largely determined by the composition of the lava it erupts. The viscosity (how fluid the lava is) and the amount of dissolved gas are the most important characteristics of magma, and both are largely determined by the amount of silica in the magma. Magma rich in silica is much more viscous than silica-poor magma, and silica-rich magma also tends to contain more dissolved gases. Lava can be broadly classified into four different compositions: Mafic lava flows show two varieties of surface texture: ʻAʻa (pronounced [ˈʔaʔa] ) and pāhoehoe ( [paːˈho.eˈho.e] ), both Hawaiian words. ʻAʻa
1989-555: A volcano is of a conical mountain, spewing lava and poisonous gases from a crater at its summit; however, this describes just one of the many types of volcano. The features of volcanoes are varied. The structure and behaviour of volcanoes depend on several factors. Some volcanoes have rugged peaks formed by lava domes rather than a summit crater while others have landscape features such as massive plateaus . Vents that issue volcanic material (including lava and ash ) and gases (mainly steam and magmatic gases) can develop anywhere on
2106-465: A volcano that has experienced one or more eruptions that produced over 1,000 cubic kilometres (240 cu mi) of volcanic deposits in a single explosive event. Such eruptions occur when a very large magma chamber full of gas-rich, silicic magma is emptied in a catastrophic caldera -forming eruption. Ash flow tuffs emplaced by such eruptions are the only volcanic product with volumes rivalling those of flood basalts . Supervolcano eruptions, while
2223-550: A young adult. The drinking age varies within states from 18 to 21 years old. In some countries, Humanist or freethinker organisations have arranged courses or camps for non-religious adolescents, in which they can study or work on ethical, social, and personal topics important for adult life, followed by a formal rite of passage comparable to the Christian Confirmation. Some of these ceremonies are even called "civil confirmations". The purpose of these ceremonies
2340-754: Is 'without sin', both believe that those at a certain age are considered innocent. According to the Grand Historian , the Duke of Zhou wrote the Rites of Zhou about 3000 years ago, which documented fundamental ceremonies in ancient China, including the Coming of Age rite. Then Confucius and his students wrote the Book of Rites , which introduced and further explained important ceremonies in Confucianism. When
2457-739: Is a volcanic field of over 60 cinder cones. Based on satellite images, it has been suggested that cinder cones might occur on other terrestrial bodies in the Solar system too; on the surface of Mars and the Moon. Stratovolcanoes (composite volcanoes) are tall conical mountains composed of lava flows and tephra in alternate layers, the strata that gives rise to the name. They are also known as composite volcanoes because they are created from multiple structures during different kinds of eruptions. Classic examples include Mount Fuji in Japan, Mayon Volcano in
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#17327828851622574-469: Is a ceremony to initiate Papua New Guinea boys into adult society. It involves dressing up in a conical hat which has long strands of leaves hanging from the edge, down to below the waist. The name Kovave is also used to describe the head-dress. In the Philippines, a popular coming of age celebration for 18-year-old women is the debut . It is normally a formal affair, with a strict dress code such as
2691-412: Is characterized by a rough, clinkery surface and is the typical texture of cooler basalt lava flows. Pāhoehoe is characterized by its smooth and often ropey or wrinkly surface and is generally formed from more fluid lava flows. Pāhoehoe flows are sometimes observed to transition to ʻaʻa flows as they move away from the vent, but never the reverse. More silicic lava flows take the form of block lava, where
2808-414: Is considered an adult when she begins menstruating, while a boy is considered an adult at twelve-to-fifteen years old. The evidence for this is the narration of Ibn Umar that he said: "Allah's Apostle called me to present myself in front of him on the eve of the battle of Uhud, while I was fourteen years of age at that time and he did not allow me to take part in that battle but he called me in front of him on
2925-565: Is derived from the name of Vulcano , a volcanic island in the Aeolian Islands of Italy whose name in turn comes from Vulcan , the god of fire in Roman mythology . The study of volcanoes is called volcanology , sometimes spelled vulcanology . According to the theory of plate tectonics, Earth's lithosphere , its rigid outer shell, is broken into sixteen larger and several smaller plates. These are in slow motion, due to convection in
3042-584: Is expressed using the volcanic explosivity index (VEI), which ranges from 0 for Hawaiian-type eruptions to 8 for supervolcanic eruptions. As of December 2022 , the Smithsonian Institution 's Global Volcanism Program database of volcanic eruptions in the Holocene Epoch (the last 11,700 years) lists 9,901 confirmed eruptions from 859 volcanoes. The database also lists 1,113 uncertain eruptions and 168 discredited eruptions for
3159-443: Is granted only after a period of preparation known as catechesis . The time of innocence before one has the ability to understand truly the laws of God and that God sees one as innocent is also seen as applying to individuals who suffer from a mental disability which prevents them from ever reaching a time when they are capable of understanding the laws of God. These individuals are thus seen, according to some Christians, as existing in
3276-648: Is legal ) is 21. Multiple localities have also raised the minimum purchase age independent of state laws. During the feudal period, the coming of age was celebrated at 15 for noblemen. Nowadays, the age is 20 for both genders. Turning 15, the "age of maturity", as the Baha'i faith terms it, is a time when a child is considered spiritually mature. Declared Baha'is that have reached the age of maturity are expected to begin observing certain Baha'i laws , such as obligatory prayer and fasting. Theravada boys, typically just under
3393-462: Is no traditionally set program marking this event, and celebrations differ from family to family. Both men and women may opt not to hold a debut at all. In the Romani culture , males are called Shave when they come of age at 20, and females Sheya . Males are then taught to drive and work in their family's line of trade, while females are taught the women's line of work. In Ukraine , Poland , and
3510-537: Is one of the several tuyas in the area of the Tuya River and Tuya Range in northern British Columbia. Tuya Butte was the first such landform analysed and so its name has entered the geological literature for this kind of volcanic formation. The Tuya Mountains Provincial Park was recently established to protect this unusual landscape, which lies north of Tuya Lake and south of the Jennings River near
3627-539: Is seen to have prepared one properly for familial, social, and civic duty and/or one's passions and unruliness of the boy are seen to have "cooled down" enough for him to be of use to a woman as a proper man. In many Western Christian churches (those deriving from Rome after the East-West Schism ), a young person is eligible to receive confirmation , which is considered a sacrament in Catholicism, and
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3744-403: Is to offer a festive ritual for those youngsters, who do not believe in any religion, but nevertheless want to mark their transition from childhood to adulthood. In Bali, the coming of age ceremony is supposed to take place after a girl's first menstrual period or a boy's voice breaks. However, due to expense, it is often delayed until later. The upper canines are filed down slightly to symbolize
3861-471: Is typically low in silica, shield volcanoes are more common in oceanic than continental settings. The Hawaiian volcanic chain is a series of shield cones, and they are common in Iceland , as well. Lava domes are built by slow eruptions of highly viscous lava. They are sometimes formed within the crater of a previous volcanic eruption, as in the case of Mount St. Helens , but can also form independently, as in
3978-617: The Cascade Volcanoes or the Japanese Archipelago , or the eastern islands of Indonesia . Hotspots are volcanic areas thought to be formed by mantle plumes , which are hypothesized to be columns of hot material rising from the core-mantle boundary. As with mid-ocean ridges, the rising mantle rock experiences decompression melting which generates large volumes of magma. Because tectonic plates move across mantle plumes, each volcano becomes inactive as it drifts off
4095-520: The Mennonites . Some traditions withhold the rite of Holy Communion from those not yet at the age of accountability, on the grounds that children do not understand what the sacrament means. In the 20th century, Roman Catholic children began to be admitted to communion some years before confirmation, with an annual First Communion service – a practice that was extended to some paedobaptist Protestant groups, such as Lutheranism and Anglicanism–but since
4212-602: The Scandinavian Countries, the legal coming of age of a person is celebrated at either 18 or 21. In South Africa, the Xhosa Ulwaluko and the Sotho Lebollo la banna circumcision and manhood ceremonies are still undertaken by the majority of males. In Spain during the 19th century, there was a civilian coming of age bound to the compulsory military service . The quintos were the boys of
4329-664: The Second Vatican Council , the withholding of confirmation to a later age, e.g. mid-teens in the United States, early teens in Ireland and Britain, has in some areas been abandoned in favour of restoring the traditional order of the three sacraments of initiation . In some denominations, full membership in the Church , if not bestowed at birth, often must wait until the age of accountability and frequently
4446-406: The cingulum , made from the wool of an ewe to symbolize fertility, and tied with the " knot of Hercules ", which was supposed to be hard to untie. The knot symbolized wifely chastity, in that it was to be untied only by her husband, but the cingulum also symbolized that the bridegroom "was belted and bound" to his wife. The bride's hair was ritually styled in "six tresses" (seni crines) , and she
4563-804: The core–mantle boundary , 3,000 kilometres (1,900 mi) deep within Earth. This results in hotspot volcanism , of which the Hawaiian hotspot is an example. Volcanoes are usually not created where two tectonic plates slide past one another. Large eruptions can affect atmospheric temperature as ash and droplets of sulfuric acid obscure the Sun and cool Earth's troposphere . Historically, large volcanic eruptions have been followed by volcanic winters which have caused catastrophic famines. Other planets besides Earth have volcanoes. For example, volcanoes are very numerous on Venus. Mars has significant volcanoes. In 2009,
4680-411: The first among equals . Tikopians have a highly developed culture with a strong Polynesian influence, including a complex social structure. New Zealand anthropologist Raymond Firth , who lived on Tikopia in 1928 and 1929, detailed its social life. He showed how the society was divided geographically into two zones and was organized into four clans, headed by clan chiefs. At the core of social life
4797-834: The landform and may give rise to smaller cones such as Puʻu ʻŌʻō on a flank of Kīlauea in Hawaii. Volcanic craters are not always at the top of a mountain or hill and may be filled with lakes such as with Lake Taupō in New Zealand. Some volcanoes can be low-relief landform features, with the potential to be hard to recognize as such and be obscured by geological processes. Other types of volcano include cryovolcanoes (or ice volcanoes), particularly on some moons of Jupiter , Saturn , and Neptune ; and mud volcanoes , which are structures often not associated with known magmatic activity. Active mud volcanoes tend to involve temperatures much lower than those of igneous volcanoes except when
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4914-485: The tunica recta , the "upright tunic", but girls wove their own. The garment was called recta because it was woven by tradition on a type of upright loom that had become archaic in later periods. Roman girls were expected to remain virgins until marriage , but boys were often introduced to heterosexual behaviors by a prostitute . The higher the social rank of a girl, the sooner she was likely to become betrothed and married. The general age of betrothal for girls of
5031-631: The "age of discretion". The catechism states that confirmation should be received "at the appropriate time", but in danger of death it can be administered to children. Together with the sacraments of baptism and the Eucharist, the sacrament of confirmation completes the sacraments of Christian initiation, "for without Confirmation and Eucharist, Baptism is certainly valid and efficacious, but Christian initiation remains incomplete." In Eastern Catholic Churches, infants receive confirmation and communion immediately after baptism. In Eastern Christianity
5148-589: The Jewish faith, boys reach religious maturity at the age of thirteen and become a bar mitzvah ("bar mitzvah" means "son of the commandment" literally, and "subject to commandments" figuratively). Girls mature a year earlier, and become a bat mitzvah ("bat mitzvah" means "daughter of the commandment") at twelve. The new men and women are looked upon as adults and are expected to uphold the Jewish commandments and laws. Also, in religious court they are adults and can marry with their new title of an adult. Nonetheless, in
5265-613: The Philippines in 2008 and sailed to Tikopia and Anuta in a 5 months voyage following the ancient migration route of the Lapita people into the Pacific. This voyage was called the Lapita Voyage, with more information about the voyage here . Its original concept (by Hanneke Boon of James Wharram Designs) to donate such a canoe was first published in 2005 in a project called 'A Voyaging Canoe for Tikopia' in order to raise money for
5382-562: The Philippines, and Mount Vesuvius and Stromboli in Italy. Ash produced by the explosive eruption of stratovolcanoes has historically posed the greatest volcanic hazard to civilizations. The lavas of stratovolcanoes are higher in silica, and therefore much more viscous, than lavas from shield volcanoes. High-silica lavas also tend to contain more dissolved gas. The combination is deadly, promoting explosive eruptions that produce great quantities of ash, as well as pyroclastic surges like
5499-767: The Talmud; Pirkei Avot (5:25), Rabbi Yehuda ben Teime gives the age of 18 as the appropriate age to get married. At the end of the bar or bat mitzvah, the boy or girl is showered with candies, which act as "sweet blessings". Besides the actual ceremony, there usually is a bar or bat mitzvah party. In various Chassidic sects when boys turn 3 years of age, they have an upsherin (sect related typical Brooklin-Yiddish for Yiddish Abshern , for German Abscheren , "Haare schneiden", engl. hair cut , lit. ' to sheer away ' ) ceremony, when they receive their first haircut. Until then, their parents allow their hair to grow long, until they undergo this esoteric rite. Little girls for
5616-572: The US. In most provinces, the legal age to purchase alcohol and cigarettes is 19, except in Alberta , Manitoba , and Quebec where it is 18 years old. In India, a person aged 18 and over is allowed to own and drive a car, and has attained the right to vote and the age of consent. Inspired by the western cultures however there are usually sweet sixteen birthday parties celebrated across the country but with little cultural significance besides having now become
5733-613: The USGS defines a volcano as active whenever subterranean indicators, such as earthquake swarms , ground inflation, or unusually high levels of carbon dioxide or sulfur dioxide are present. The USGS defines a dormant volcano as any volcano that is not showing any signs of unrest such as earthquake swarms, ground swelling, or excessive noxious gas emissions, but which shows signs that it could yet become active again. Many dormant volcanoes have not erupted for thousands of years, but have still shown signs that they may be likely to erupt again in
5850-425: The age of 18. On the night before the wedding, the bride bound up her hair with a yellow hairnet she had woven. The confining of her hair signifies the harnessing of her sexuality within marriage. Her weaving of the tunica recta and the hairnet demonstrated her skill and her capacity for acting in the traditional matron's role as custos domi , "guardian of the house". On her wedding day, she belted her tunic with
5967-456: The age of 20 years, undergo a Shinbyu ceremony, where they are initiated into the Temple as Novice Monks ( Samanera ). They will typically stay in the monastery for between 3 days and 3 years, most commonly for one 3-month "rainy season retreat" ( vassa ), held annually from late July to early October. During this period the boys experience the rigors of an orthodox Buddhist monastic lifestyle –
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#17327828851626084-593: The banning of traditional birth control, which had the consequence of a 50% increase of the population: 1,200 in 1920 to 1,800 in 1950. The increase in population resulted in migration to other places in the Solomon Islands, including in the settlement of Nukukaisi in Makira . The arrival of Christianity greatly disrupted the indigenous cultures and traditions, with lasting negative effects that remain evident today. On Tikopia in 1964, explorers found artifacts from
6201-446: The baptising priest confirms infants directly after baptism . The Church of Jesus Christ of Latter-day Saints sets the age of accountability and minimum age for baptism at 8 years of age. All persons younger than 8 are considered innocent and not accountable for their sinning. The Church considers mentally challenged individuals whose mental age is under 8 to be in a perpetual state of innocence, while other doctrines teach that no one
6318-510: The boundary with the Yukon Territory . Mud volcanoes (mud domes) are formations created by geo-excreted liquids and gases, although several processes may cause such activity. The largest structures are 10 kilometres in diameter and reach 700 meters high. The material that is expelled in a volcanic eruption can be classified into three types: The concentrations of different volcanic gases can vary considerably from one volcano to
6435-486: The building of the canoes. The project was filmed and is available as DVD. In 2013 a Norwegian mother and father brought their two children and a nephew to Tikopia and lived there for 6 months. A film crew went along and a 13 episode children's series was made of the family experiences and stay, primarily focusing on the experiences of the young daughter of the Norwegian family, Ivi, with the local children, local school
6552-402: The case of Lassen Peak . Like stratovolcanoes, they can produce violent, explosive eruptions, but the lava generally does not flow far from the originating vent. Cryptodomes are formed when viscous lava is forced upward causing the surface to bulge. The 1980 eruption of Mount St. Helens was an example; lava beneath the surface of the mountain created an upward bulge, which later collapsed down
6669-473: The chiefs within the clan organization were key dimensions of island life. Raymond Firth, who did his post-graduate anthropological study under Bronislaw Malinowski in 1924, speculates about the ways population control may have been achieved, including celibacy, warfare (including expulsion), infanticide and sea-voyaging (which claimed many youths). Firth's book, Tikopia Ritual and Belief (1967, London, George Allen & Unwin) remains an important source for
6786-580: The coming of age ceremony in the present day. In some Latin American countries, when a female reaches the age of 15, her relatives organize a very expensive celebration. It is usually a large party, called a Quinceañera in Spanish speaking countries and Baile de Debutantes (also called Festa de 15 [años] , literally: Party of 15 [years]) in Brazil. The legal age of adulthood varies by country. Kovave
6903-456: The debutante. The Roses sometimes dance with the débutante before presenting their flower and speech, with the last being her father or boyfriend. Other variations exist, such as 18 Treasures (of any gender; gives a present instead of a candle or flower) or other types of flowers aside from roses being given, but the significance of "18" is almost always retained. Filipino men, on the other hand, celebrate their debut on their 21st birthday. There
7020-422: The early twentieth century, the age of legal majority was 21, although the marriageable age was typically lower. Even though turning 21 now has few, if any, legal effects in most of these countries, its former legal status as the age of majority has caused it to continue to be celebrated. In Canada, a person aged 16 and over can legally drive a car and work, but are only considered to be an adult at age 18 like in
7137-615: The effacing of the individual's "wild" nature. While in Nias island , a young man must jump up over a stone (normally about 1 or 2 meters) as a part of the coming of age ceremony. Since 1948, the age of majority in Japan has been 20; persons under 20 are not permitted to smoke or drink. Until June 2016, people under 20 were not permitted to vote. The government of Japan lowered the age of majority to 18, which came into effect in 2021. Coming-of-age ceremonies, known as seijin shiki , are held on
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#17327828851627254-799: The enormous area they cover, and subsequent concealment under vegetation and glacial deposits, supervolcanoes can be difficult to identify in the geologic record without careful geologic mapping . Known examples include Yellowstone Caldera in Yellowstone National Park and Valles Caldera in New Mexico (both western United States); Lake Taupō in New Zealand; Lake Toba in Sumatra , Indonesia; and Ngorongoro Crater in Tanzania. Volcanoes that, though large, are not large enough to be called supervolcanoes, may also form calderas in
7371-490: The equivalent of the Buddhist enlightenment by way of a combination of personalized meditations , reincarnations and spirit possessions . Children are not required to perform any obligatory religious obligations prior to reaching the age of puberty, although they are encouraged to begin praying at the age of seven. Once a person begins puberty, they are required to perform salat and other obligations of Islam. A girl
7488-488: The eve of the battle of the Trench when I was fifteen years old, and he allowed me to join the battle." (Reported by Bukhari and Muslim). When Umar Ibn Abdul Aziz heard this Hadith he made this age the evidence to differentiate between a mature and an immature person. In some Islamic cultures circumcision ( khitan ) can be a ritual associated with coming of age for boys, taking place in late childhood or early adolescence. In
7605-452: The first time co-light some extra ″ Shabbat candles, after their mothers did so, also when they turn 3 years of age. In the Shinto faith, boys were taken to the shrine of their patron deity at approximately 12–14 years old. They were then given adult clothes and a new haircut. This was called Genpuku . In Sikhism , when one reaches the age of maturity, the men will typically partake in
7722-431: The flow is covered with angular, vesicle-poor blocks. Rhyolitic flows typically consist largely of obsidian . Tephra is made when magma inside the volcano is blown apart by the rapid expansion of hot volcanic gases. Magma commonly explodes as the gas dissolved in it comes out of solution as the pressure decreases when it flows to the surface . These violent explosions produce particles of material that can then fly from
7839-610: The formation of a submarine volcano off the coast of Mayotte . Subglacial volcanoes develop underneath ice caps . They are made up of lava plateaus capping extensive pillow lavas and palagonite . These volcanoes are also called table mountains, tuyas , or (in Iceland) mobergs. Very good examples of this type of volcano can be seen in Iceland and in British Columbia . The origin of the term comes from Tuya Butte , which
7956-601: The full rights and responsibilities of an adult. Many cultures retain ceremonies to confirm the coming of age, and coming-of-age stories are a well-established sub-genre in literature , the film industry , and other forms of media. In certain states in Ancient Greece, such as Sparta and Crete , adolescent boys were expected to enter into a mentoring relationship with an adult man, in which they would be taught skills pertaining to adult life, such as hunting , martial arts and fine arts. The puberty ritual for
8073-585: The future. In an article justifying the re-classification of Alaska's Mount Edgecumbe volcano from "dormant" to "active", volcanologists at the Alaska Volcano Observatory pointed out that the term "dormant" in reference to volcanoes has been deprecated over the past few decades and that "[t]he term "dormant volcano" is so little used and undefined in modern volcanology that the Encyclopedia of Volcanoes (2000) does not contain it in
8190-491: The gardens of the New Guinea Highlands . Their agricultural practices are strongly and consciously tied to the population density . For example, around 1600, the people agreed to slaughter all pigs on the island, and substitute fishing, because the pigs were taking too much food that could be eaten by people. Tikopians have developed rituals and figurative constructions related to their fishing practices. Unlike
8307-466: The glossaries or index", however the USGS still widely employs the term. Previously a volcano was often considered to be extinct if there were no written records of its activity. Such a generalization is inconsistent with observation and deeper study, as has occurred recently with the unexpected eruption of the Chaitén volcano in 2008. Modern volcanic activity monitoring techniques, and improvements in
8424-504: The god Liber , who embodied both political and sexual liberty, but other dates could be chosen for individual reasons. Rome lacked the elaborate female puberty rituals of ancient Greece, and for girls, the wedding ceremony was in part a rite of passage for the bride. Girls coming of age dedicated their dolls to Artemis , the goddess most concerned with virginity, or to Aphrodite when they were preparing for marriage. All adolescents in ritual preparation to transition to adult status wore
8541-492: The interior of a continent and lead to rifting. Early stages of rifting are characterized by flood basalts and may progress to the point where a tectonic plate is completely split. A divergent plate boundary then develops between the two halves of the split plate. However, rifting often fails to completely split the continental lithosphere (such as in an aulacogen ), and failed rifts are characterized by volcanoes that erupt unusual alkali lava or carbonatites . Examples include
8658-570: The islands as Polynesian navigation skills are recognised to have allowed deliberate journeys on double-hull sailing canoes or outrigger canoes . The voyagers moved into the Tuvaluan atolls as a stepping stone to migration into the Polynesian outlier communities in Melanesia and Micronesia . In Tikopian mythology Atua Fafine and Atua I Raropuka are creator gods and Atua I Kafika is
8775-456: The local chief Tafua and his family, etc. The series was shown on NRK television channel NRK Super . In October 2018, one of the chief of the island, Ti Namo, made his first visit to the western world to share his worries about climate change on his island. He went to Grenoble in France, where he presented his documentary Nous Tikopia before a national release on 7 November, and declared to
8892-551: The many New World religions that it subsequently gave birth to, men and women are often initiated to the service of one of the hundreds of subsidiary spirits that serve the Orisha Olodumare , the group's conception of the Almighty God . The mystic links that are forged by way of these initiations, which typically occur at puberty, are the conduits that are used by adherents to attempt to achieve what can be seen as
9009-555: The meditative practices ( bhavana , or dhyana ) that are at the heart of Buddhism's program for the self-development of alert tranquillity ( samadhi ), wisdom ( prajna ), and divine mental states ( brahmavihara ). After living the novitiate monastic life for some time, the boy, now considered to have "come of age", will either take higher ordination as a fully ordained monk (a bhikkhu ) or will (more often) return to lay life. In Southeast Asian countries, where most practitioners of Theravada Buddhism reside, women will often refuse to marry
9126-419: The mid-oceanic ridge is above sea level, volcanic islands are formed, such as Iceland . Subduction zones are places where two plates, usually an oceanic plate and a continental plate, collide. The oceanic plate subducts (dives beneath the continental plate), forming a deep ocean trench just offshore. In a process called flux melting , water released from the subducting plate lowers the melting temperature of
9243-545: The migration is not precisely identified but is understood to be some time between the 10th century to the mid-13th century. The arrival of the voyagers in Anuta could have occurred later. The pattern of settlement that is believed to have occurred is that the Polynesians spread out from Tonga and other islands in the central and south eastern Pacific. During pre-European-contact times there was frequent canoe voyaging between
9360-551: The modelling of the factors that produce eruptions, have helped the understanding of why volcanoes may remain dormant for a long time, and then become unexpectedly active again. The potential for eruptions, and their style, depend mainly upon the state of the magma storage system under the volcano, the eruption trigger mechanism and its timescale. For example, the Yellowstone volcano has a repose/recharge period of around 700,000 years, and Toba of around 380,000 years. Vesuvius
9477-415: The most dangerous type, are very rare; four are known from the last million years , and about 60 historical VEI 8 eruptions have been identified in the geologic record over millions of years. A supervolcano can produce devastation on a continental scale, and severely cool global temperatures for many years after the eruption due to the huge volumes of sulfur and ash released into the atmosphere. Because of
9594-438: The mud volcano is actually a vent of an igneous volcano. Volcanic fissure vents are flat, linear fractures through which lava emerges. Shield volcanoes, so named for their broad, shield-like profiles, are formed by the eruption of low-viscosity lava that can flow a great distance from a vent. They generally do not explode catastrophically but are characterized by relatively gentle effusive eruptions . Since low-viscosity magma
9711-452: The next. Water vapour is typically the most abundant volcanic gas, followed by carbon dioxide and sulfur dioxide . Other principal volcanic gases include hydrogen sulfide , hydrogen chloride , and hydrogen fluoride . A large number of minor and trace gases are also found in volcanic emissions, for example hydrogen , carbon monoxide , halocarbons , organic compounds, and volatile metal chlorides. The form and style of an eruption of
9828-876: The north side of the mountain. Cinder cones result from eruptions of mostly small pieces of scoria and pyroclastics (both resemble cinders, hence the name of this volcano type) that build up around the vent. These can be relatively short-lived eruptions that produce a cone-shaped hill perhaps 30 to 400 metres (100 to 1,300 ft) high. Most cinder cones erupt only once and some may be found in monogenetic volcanic fields that may include other features that form when magma comes into contact with water such as maar explosion craters and tuff rings . Cinder cones may form as flank vents on larger volcanoes, or occur on their own. Parícutin in Mexico and Sunset Crater in Arizona are examples of cinder cones. In New Mexico , Caja del Rio
9945-549: The ocean surface as new islands or floating pumice rafts . In May and June 2018, a multitude of seismic signals were detected by earthquake monitoring agencies all over the world. They took the form of unusual humming sounds, and some of the signals detected in November of that year had a duration of up to 20 minutes. An oceanographic research campaign in May 2019 showed that the previously mysterious humming noises were caused by
10062-420: The ocean surface, due to the rapid cooling effect and increased buoyancy in water (as compared to air), which often causes volcanic vents to form steep pillars on the ocean floor. Hydrothermal vents are common near these volcanoes, and some support peculiar ecosystems based on chemotrophs feeding on dissolved minerals. Over time, the formations created by submarine volcanoes may become so large that they break
10179-471: The ocean's surface. In the deep ocean basins, the tremendous weight of the water prevents the explosive release of steam and gases; however, submarine eruptions can be detected by hydrophones and by the discoloration of water because of volcanic gases . Pillow lava is a common eruptive product of submarine volcanoes and is characterized by thick sequences of discontinuous pillow-shaped masses which form underwater. Even large submarine eruptions may not disturb
10296-468: The one that destroyed the city of Saint-Pierre in Martinique in 1902. They are also steeper than shield volcanoes, with slopes of 30–35° compared to slopes of generally 5–10°, and their loose tephra are material for dangerous lahars . Large pieces of tephra are called volcanic bombs . Big bombs can measure more than 1.2 metres (4 ft) across and weigh several tons. A supervolcano is defined as
10413-425: The overlying mantle wedge, thus creating magma . This magma tends to be extremely viscous because of its high silica content, so it often does not reach the surface but cools and solidifies at depth . When it does reach the surface, however, a volcano is formed. Thus subduction zones are bordered by chains of volcanoes called volcanic arcs . Typical examples are the volcanoes in the Pacific Ring of Fire , such as
10530-619: The plume, and new volcanoes are created where the plate advances over the plume. The Hawaiian Islands are thought to have been formed in such a manner, as has the Snake River Plain , with the Yellowstone Caldera being part of the North American plate currently above the Yellowstone hotspot . However, the mantle plume hypothesis has been questioned. Sustained upwelling of hot mantle rock can develop under
10647-576: The press, "Before, we suffered a cyclone every ten years. Today it's every two years." Extinct volcano A volcano is a rupture in the crust of a planetary-mass object , such as Earth , that allows hot lava , volcanic ash , and gases to escape from a magma chamber below the surface. The process that forms volcanoes is called volcanism . On Earth, volcanoes are most often found where tectonic plates are diverging or converging , and because most of Earth's plate boundaries are underwater, most volcanoes are found underwater. For example,
10764-488: The rapidly Westernizing society of much of the rest of Temotu Province, Tikopia society is little changed from ancient times. Its people take great pride in their customs, and see themselves as holding fast to their Polynesian traditions while they regard the Melanesians around them to have lost most of theirs. The island is controlled by four chiefs ( ariki ) Kafika, Tafua, Taumako and Fangarere, with Kafika recognised as
10881-512: The responsibility of owning their own car. People are allowed to drive at age 15 in Idaho and Montana. At 16, people are also legally allowed to donate blood and work in most establishments. In spite of this, it is not until the age of 18 that a person is legally considered an adult and can vote and join the military (age 17 with parental consent). The legal age for purchasing and consuming alcohol, tobacco, and recreational marijuana (in states where it
10998-435: The same time interval. Volcanoes vary greatly in their level of activity, with individual volcanic systems having an eruption recurrence ranging from several times a year to once in tens of thousands of years. Volcanoes are informally described as erupting , active , dormant , or extinct , but the definitions of these terms are not entirely uniform among volcanologists. The level of activity of most volcanoes falls upon
11115-492: The same way; they are often described as "caldera volcanoes". Submarine volcanoes are common features of the ocean floor. Volcanic activity during the Holocene Epoch has been documented at only 119 submarine volcanoes, but there may be more than one million geologically young submarine volcanoes on the ocean floor. In shallow water, active volcanoes disclose their presence by blasting steam and rocky debris high above
11232-539: The seal of the Holy Spirit . In some Christian denominations, the confirmand (now an adult in the eyes of the Church) takes a Saint 's name as a confirmation name. In Christian denominations that practice Believer's Baptism (baptism by voluntary decision, as opposed to baptism in early infancy), it is normatively carried out after the age of accountability has arrived, as with many Anabaptist denominations, such as
11349-419: The second Monday of January. At the ceremony, all of the men and women participating are brought to a government building and listen to many speakers, similar to a graduation ceremony. At the conclusion of the ceremony government officials give speeches, and small presents are handed out to the new adults. In Korea, citizens are permitted to marry, vote, drive, drink alcohol, and smoke at age 19. The Monday of
11466-516: The shipwreck of the expedition of Jean-François de Galaup, comte de Lapérouse . Cyclone Zoe in December 2002 devastated the vegetation and human settlements in Tikopia. Despite the extensive damage, no deaths were reported, as the islanders followed their traditions and sheltered in the caves in the higher ground. The narrow bank that separated the freshwater lagoon from the sea was breached by
11583-622: The solidified erupted material that makes up the mantle of a volcano may be stripped away that its inner anatomy becomes apparent. Using the metaphor of biological anatomy , such a process is called "dissection". Cinder Hill , a feature of Mount Bird on Ross Island , Antarctica , is a prominent example of a dissected volcano. Volcanoes that were, on a geological timescale, recently active, such as for example Mount Kaimon in southern Kyūshū , Japan , tend to be undissected. Eruption styles are broadly divided into magmatic, phreatomagmatic, and phreatic eruptions. The intensity of explosive volcanism
11700-629: The southernmost of the Solomon Islands . Some discussions of Tikopian society include its nearest neighbour, the even tinier island of Anuta . While it is located in Melanesia , the people of Tikopia are culturally Polynesian . Their language, Tikopian , is a member of the Samoic branch of the Polynesian languages . The linguistic analysis indicates that Tikopia was colonized by seafaring Polynesians, mostly from Tuvalu . The time frame of
11817-434: The storm, resulting in the continuing contamination of the lagoon and the threatened death of the sago palms on which the islanders depend for survival. A remarkable international effort by "friends of" the island, including many yacht crews who had had contact with Tikopia over the decades, culminated in the construction in 2006 of a gabion dam to seal the breach. Jared Diamond's book Collapse describes Tikopia as
11934-471: The study of Tikopia culture. The Anglican Melanesian Mission first made contact with Tikopia in 1858. A mission teacher was not allowed to settle on the island until 1907. Forced conversion to Christianity of the total population did not occur until the 1950s. Administratively, Tikopia is part of the Anglican Church of Melanesia 's Diocese of Temotu . The introduction of Christianity resulted to
12051-559: The supreme sky god. The population of Tikopia is about 1,200, distributed among more than 20 villages mostly along the coast. The largest village is Matautu on the west coast (not to be confused with Mata-Utu , the capital of Wallis and Futuna ). Historically, the tiny island has supported a high-density population of a thousand or so. Strict social controls over reproduction prevented further increase. Tikopians practice an intensive system of agriculture (which has been compared to permaculture ), similar in principle to forest gardening and
12168-406: The surrounding areas, and initially not seismically monitored before its unanticipated and catastrophic eruption of 1991. Two other examples of volcanoes that were once thought to be extinct, before springing back into eruptive activity were the long-dormant Soufrière Hills volcano on the island of Montserrat , thought to be extinct until activity resumed in 1995 (turning its capital Plymouth into
12285-434: The theory of plate tectonics. For example, some volcanoes are polygenetic with more than one period of activity during their history; other volcanoes that become extinct after erupting exactly once are monogenetic (meaning "one life") and such volcanoes are often grouped together in a geographical region. At the mid-ocean ridges , two tectonic plates diverge from one another as hot mantle rock creeps upwards beneath
12402-444: The thinned oceanic crust . The decrease of pressure in the rising mantle rock leads to adiabatic expansion and the partial melting of the rock, causing volcanism and creating new oceanic crust. Most divergent plate boundaries are at the bottom of the oceans, and so most volcanic activity on Earth is submarine, forming new seafloor . Black smokers (also known as deep sea vents) are evidence of this kind of volcanic activity. Where
12519-529: The third week of May is "coming-of-age day". There has been a traditional coming of age ceremony since before the Goryeo dynasty, but it has mostly disappeared. In the traditional way, when boys or girls were between the ages of fifteen and twenty, boys wore gat , a Korean traditional hat made of bamboo and horsehair, and girls did their hair in a chignon with a binyeo , a Korean traditional ornamental hairpin. Both of them wore hanbok , which are sometimes worn at
12636-499: The tradition was simply lost. In 2002, conscription was abolished in Spain in favor of an all-professional military . As a result, the quintos disappeared except for a few rural areas where it is kept as a coming of age traditional party without further consequences. In the United States, people are allowed to drive at 16 in all states, with the exception of New Jersey, which requires drivers to be 17 and older, and sometimes receive
12753-431: The underlying ductile mantle , and most volcanic activity on Earth takes place along plate boundaries, where plates are converging (and lithosphere is being destroyed) or are diverging (and new lithosphere is being created). During the development of geological theory, certain concepts that allowed the grouping of volcanoes in time, place, structure and composition have developed that ultimately have had to be explained in
12870-412: The upper classes was fourteen, but for patricians as early as twelve. Weddings, however, were often postponed until the girl was considered mature enough. Males typically postponed marriage till they had served in the military for some time and were beginning their political careers, around age 25. Patrician males, however, might marry considerably earlier; Julius Caesar was married for the first time by
12987-450: The village that reached the age of eligibility for military service (18 years), thus forming the quinta of a year. In rural Spain, the mili was the first and sometimes the only experience of life away from family. In the days before their departure, the quintos knocked on every door to ask for food and drink. They held a common festive meal with what they gathered and sometimes painted some graffiti reading " Vivan los quintos del año " as
13104-492: The volcano. Solid particles smaller than 2 mm in diameter ( sand-sized or smaller) are called volcanic ash. Tephra and other volcaniclastics (shattered volcanic material) make up more of the volume of many volcanoes than do lava flows. Volcaniclastics may have contributed as much as a third of all sedimentation in the geologic record. The production of large volumes of tephra is characteristic of explosive volcanism. Through natural processes, mainly erosion , so much of
13221-424: The volcanoes of the East African Rift . A volcano needs a reservoir of molten magma (e.g. a magma chamber), a conduit to allow magma to rise through the crust, and a vent to allow the magma to escape above the surface as lava. The erupted volcanic material (lava and tephra) that is deposited around the vent is known as a volcanic edifice , typically a volcanic cone or mountain. The most common perception of
13338-514: The young Roman male involved shaving his beard and taking off his bulla , an amulet worn to mark and protect underage youth, which he then dedicated to his household gods, the Lares . He assumed the toga virilis ("toga of manhood"), was enrolled as a citizen on the census , and soon began his military service. Traditionally, the ceremony was held on the Liberalia , the festival in honor of
13455-478: Was te paito – the house inherited from male ( patrilineal ) ancestors, who were buried inside it. Relationships with the family grouping of one's mother ( matrilateral relations) were also very important. The relations between a mother's brother and his nephew had a sacred dimension: the uncle oversaw the passage of his nephew through life, in particular, officiating at his manhood ceremonies . Intricate economic and ritual links between paito houses and deference to
13572-421: Was described by Roman writers as having been covered with gardens and vineyards before its unexpected eruption of 79 CE , which destroyed the towns of Herculaneum and Pompeii . Accordingly, it can sometimes be difficult to distinguish between an extinct volcano and a dormant (inactive) one. Long volcano dormancy is known to decrease awareness. Pinatubo was an inconspicuous volcano, unknown to most people in
13689-557: Was veiled until uncovered by her husband at the end of the ceremony, a ritual of surrendering her virginity to him. The legal age of majority is 18 in most Anglo-Celtic cultures (such as Australia , New Zealand , the United Kingdom , and Ireland ). One is legally enabled to vote, purchase tobacco and alcohol, marry without parental consent (although one can wed at 16 in Scotland and New Zealand ) and sign contracts. But in
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