Coffee is a brewed drink prepared from roasted coffee beans, the seeds of berries from certain Coffea species. The genus Coffea is native to tropical Africa and Madagascar, the Comoros, Réunion in the Indian Ocean. Coffee plants are now cultivated in over 70 countries in the equatorial regions of the Americas, Southeast Asia, Indian subcontinent, Africa; the two most grown are C. arabica and C. robusta. Once ripe, coffee berries are picked and dried. Dried coffee seeds are roasted to varying degrees, depending on the desired flavor. Roasted beans are ground and brewed with near-boiling water to produce the beverage known as coffee. Coffee is darkly colored, bitter acidic and has a stimulating effect in humans due to its caffeine content, it is one of the most popular drinks in the world, it can be prepared and presented in a variety of ways. It is served hot, although iced coffee is a popular alternative. Clinical studies indicate that moderate coffee consumption is benign or mildly beneficial in healthy adults, with continuing research on whether long-term consumption lowers the risk of some diseases, although those long-term studies are of poor quality.
The earliest credible evidence of coffee-drinking appears in modern-day Yemen in southern Arabia in the middle of the 15th century in Sufi shrines. It was here in Arabia that coffee seeds were first roasted and brewed in a similar way to how it is now prepared, but the coffee seeds had to be first exported from East Africa to Yemen, as the Coffea arabica plant is thought to have been indigenous to the former. The Yemenis began to cultivate the seed. By the 16th century, the drink had reached Persia and North Africa. From there, it spread to the rest of the world; as of 2016, Brazil was the leading grower of producing one-third of the world total. Coffee is a major export commodity, it is one of the most valuable commodities exported by developing countries. Green, unroasted coffee is one of the most traded agricultural commodities in the world; some controversy has been associated with coffee cultivation and the way developed countries trade with developing nations, as well as the impact on the environment with regards to the clearing of land for coffee-growing and water use.
The markets for fair trade and organic coffee are expanding, notably in the USA. The word coffee appears to have derived from the name of the region where coffee beans were first used by a herder in the 6th or 9th century: kaffa derived from Kaffa Province, the name of the region in ancient Abyssinia; the word "coffee" entered the English language in 1582 via the Dutch koffie, borrowed from the Ottoman Turkish kahve, borrowed in turn from the Arabic qahwah. The Arabic word qahwah was traditionally held to refer to a type of wine whose etymology is given by Arab lexicographers as deriving from the verb qahiya, "to lack hunger", in reference to the drink's reputation as an appetite suppressant, it has been proposed that the source may be the Proto-Central Semitic root q-h-h meaning "dark". The term "coffee pot" dates from 1705; the expression "coffee break" was first attested in 1952. According to legend, ancestors of today's Oromo people in a region of Kaffa in Ethiopia were believed to have been the first to recognize the energizing effect of the coffee plant.
However, there is no direct evidence, found earlier than the 15th century indicating where in Africa coffee first grew or who among the native populations might have used it as a stimulant. The story of Kaldi, the 9th-century Ethiopian goatherd who discovered coffee when he noticed how excited his goats became after eating the beans from a coffee plant, did not appear in writing until 1671 and is apocryphal. Other accounts attribute the discovery of coffee to Sheikh Omar. According to an ancient chronicle, known for his ability to cure the sick through prayer, was once exiled from Mocha in Yemen to a desert cave near Ousab. Starving, Omar found them to be bitter, he tried roasting the seeds to improve the flavor. He tried boiling them to soften the seed, which resulted in a fragrant brown liquid. Upon drinking the liquid Omar was sustained for days; as stories of this "miracle drug" reached Mocha, Omar was made a saint. The earliest credible evidence of coffee-drinking or knowledge of the coffee tree appears in the middle of the 15th century in the accounts of Ahmed al-Ghaffar in Yemen.
It was here in Arabia that coffee seeds were first roasted and brewed, in a similar way to how it is prepared now. Coffee was used by Sufi circles to stay awake for their religious rituals. Accounts differ on the origin of the coffee plant prior to its appearance in Yemen. From Ethiopia, coffee could have been introduced to Yemen via trade across the Red Sea. One account credits Muhammad Ibn Sa'd for bringing the beverage to Aden from the African coast. Other early accounts say Ali ben Omar of the Shadhili Sufi order was the first to introduce coffee to Arabia. According to al Shardi, Ali ben Omar may have encountered coffee during his stay with the Adal king Sadadin's companions in 1401. Famous 16th-century Islamic scholar Ibn Hajar al-Haytami notes in his
Mount Tambora, or Tomboro, is an active stratovolcano in the northern part of Sumbawa, one of the Lesser Sunda Islands of Indonesia. Tambora is known for its major eruption in 1815, it was formed due to the active subduction zones beneath it, before the eruption of 1815, it was more than 4,300 metres high, making it one of the tallest peaks in the Indonesian archipelago. The large magma chamber under Tambora had been drained by pre-1815 eruptions and underwent several centuries of dormancy as it refilled. Volcanic activity reached a peak that year. With a Volcanic Explosivity Index of 7, the eruption was the most devastating in recorded history; the explosion was heard on Sumatra island, more than 2,000 kilometres away. Heavy volcanic ash rains were observed as far away as Borneo, Sulawesi and Maluku islands, the maximum elevation of Tambora was reduced from about 4,300 metres to 2,850 metres. Although estimates vary, the death toll was at least 71,000 people; the eruption caused global climate anomalies in the following years, while 1816 became known as the "year without a summer" due to the impact on North American and European weather.
In the Northern Hemisphere, crops failed and livestock died, resulting in the worst famine of the century. During a 2004 excavation, archaeologists discovered the remains of a house destroyed and buried by the 1815 eruption; the site has remained intact beneath three metres of pyroclastic deposits and provides insight into the culture that vanished. Today, Mount Tambora is monitored for volcanic activity; the mountain is administered by the Bima Regency in the northeast and by the Dompu Regency in the west and south. Mount Tambora known as Tomboro, is situated in the northern part of Sumbawa island, part of the Lesser Sunda Islands, it is a segment of the Sunda Arc, a string of volcanic islands that make up the southern chain of the Indonesian archipelago. Tambora forms its own peninsula on Sumbawa, known as the Sanggar peninsula. To the north of the peninsula is the Flores Sea and to the south is the 86 kilometres long and 36 kilometres wide Saleh Bay. At the mouth of Saleh Bay there is an islet called Mojo.
Besides the seismologists and vulcanologists who monitor the mountain's activity, Mount Tambora is an area of interest to archaeologists and biologists. The mountain attracts tourists for hiking and wildlife activities, though in small numbers; the two nearest cities are Bima. There are three concentrations of villages around the mountain slope. At the east is Sanggar village, to the northwest are Doro Peti and Pesanggrahan villages, to the west is Calabai village. There are two routes of ascent to the caldera; the first begins at Doro Mboha village on the southeast of the mountain and follows a paved road through a cashew plantation to an elevation of 1,150 metres. The road terminates at the southern part of the caldera, which at 1,950 metres is reachable only by hiking; this location is only one hour from the caldera, serves as a base camp from which volcanic activity can be monitored. The second route starts from Pancasila village at the northwest of the mountain and is only accessible on foot.
The 16 kilometres hike from Pancasila at 740 metres elevation to the caldera of the volcano takes 14 hours with several stops en route to the top. The trail leads through dense jungle with wildlife as Elaeocarpus batudulangii, Asian water monitor, reticulated python, orange-footed scrubfowl, pale-shouldered cicadabird and scaly-crowned honeyeater, yellow-crested cockatoo, yellow-ringed white-eye, helmeted friarbird, wild boar, Javan rusa and crab-eating macaques. Tambora is located 340 kilometres north of the Java Trench system and 180 to 190 kilometres above the upper surface of the active north-dipping subduction zone. Sumbawa Island is flanked to the south by oceanic crust; the convergence rate of the Australian Plate beneath the Sunda Plate is 7.8 centimetres per year. Estimates for the onset of the volcanism at Mount Tambora range to 43 ka; the latter estimate published in 2012 is based on argon dating of the first pre-caldera lava flows. The formation of Tambora drained a large magma chamber pre-existing under the mountain.
The Mojo islet was formed as part of this geological process in which Saleh Bay first appeared as a sea basin about 25,000 years BP. A high volcanic cone with a single central vent formed before the 1815 eruption, which follows a stratovolcano shape; the diameter at the base is 60 kilometres. The volcano erupted lava, which descended over steep slopes. Tambora has produced trachyandesite rocks which are rich in potassium; the volcanics contain phenocrysts of apatite, clinopyroxene, magnetite and plagioclase, with the exact composition of the phenocrysts varying between different rock types. Orthopyroxene is absent in the trachyandesites of Tambora. Olivine is most present in the rocks with less than 53 percent SiO2, while it is absent in the more silica-rich volcanics, characterised by the presence of biotite phenocrysts; the mafic series contain titanium magnetite and the trachybasalts are dominated by anorthosite-rich plagioclase. Rubidium and phosphorus pentoxide are rich in the lavas from Tambora, more than the comparable ones from Mount Rinjani.
The lavas of Tambora are enriched in zircon compared to those of Rinjani. The magma involved in the 1815 eruption originated in the mantle and was further modified by melts derived from subducted sediments, fluids derived from t
Bali is a province of Indonesia and the westernmost of the Lesser Sunda Islands. Located east of Java and west of Lombok, the province includes the island of Bali and a few smaller neighbouring islands, notably Nusa Penida, Nusa Lembongan, Nusa Ceningan; the provincial capital, Denpasar, is the most populous city in the Lesser Sunda Islands and the second largest, after Makassar, in Eastern Indonesia. Bali is the only Hindu-majority province in Indonesia, with 83.5% of the population adhering to Balinese Hinduism. Bali is Indonesia's main tourist destination, which has seen a significant rise in tourists since the 1980s. Tourism-related business makes up 80% of its economy, it is renowned for its developed arts, including traditional and modern dance, painting, leather and music. The Indonesian International Film Festival is held every year in Bali. In March 2017, TripAdvisor named Bali as the world's top destination in its Traveller's Choice award. Bali is part of the area with the highest biodiversity of marine species.
In this area alone, over 500 reef-building coral species can be found. For comparison, this is about seven times as many as in the entire Caribbean. Most Bali was the host of the Miss World 2013 and 2018 Annual Meetings of the International Monetary Fund and the World Bank Group. Bali is the home of a UNESCO World Heritage Site, it is home to a unified confederation of kingdoms composed of 10 traditional royal Balinese houses, each house ruling a specific geographic area. The confederation is the successor of the Bali Kingdom; the royal houses are not recognised by the government of Indonesia. Bali was inhabited around 2000 BCE by Austronesian people who migrated from Southeast Asia and Oceania through Maritime Southeast Asia. Culturally and linguistically, the Balinese are related to the people of the Indonesian archipelago, the Philippines and Oceania. Stone tools dating from this time have been found near the village of Cekik in the island's west. In ancient Bali, nine Hindu sects existed, namely Pasupata, Siwa Shidanta, Bodha, Resi and Ganapatya.
Each sect revered a specific deity as its personal Godhead. Inscriptions from 896 and 911 do not mention a king, until 914, they reveal an independent Bali, with a distinct dialect, where Buddhism and Sivaism were practiced simultaneously. Mpu Sindok's great-granddaughter, married the Bali king Udayana Warmadewa around 989, giving birth to Airlangga around 1001; this marriage brought more Hinduism and Javanese culture to Bali. Princess Sakalendukirana appeared in 1098. Suradhipa reigned from 1115 to 1119, Jayasakti from 1146 until 1150. Jayapangus appears on inscriptions between 1178 and 1181, while Adikuntiketana and his son Paramesvara in 1204. Balinese culture was influenced by Indian and Hindu culture, beginning around the 1st century AD; the name Bali dwipa has been discovered from various inscriptions, including the Blanjong pillar inscription written by Sri Kesari Warmadewa in 914 AD and mentioning Walidwipa. It was during this time that the people developed their complex irrigation system subak to grow rice in wet-field cultivation.
Some religious and cultural traditions still practiced. The Hindu Majapahit Empire on eastern Java founded a Balinese colony in 1343; the uncle of Hayam Wuruk is mentioned in the charters of 1384–86. A mass Javanese immigration to Bali occurred in the next century when the Majapahit Empire fell in 1520. Bali's government became an independent collection of Hindu kingdoms which led to a Balinese national identity and major enhancements in culture and economy; the nation with various kingdoms became independent for up to 386 years until 1906, when the Dutch subjugated and repulsed the natives for economic control and took it over. The first known European contact with Bali is thought to have been made in 1512, when a Portuguese expedition led by Antonio Abreu and Francisco Serrão sighted its northern shores, it was the first expedition of a series of bi-annual fleets to the Moluccas, that throughout the 16th century traveled along the coasts of the Sunda Islands. Bali was mapped in 1512, in the chart of Francisco Rodrigues, aboard the expedition.
In 1585, a ship foundered off the Bukit Peninsula and left a few Portuguese in the service of Dewa Agung. In 1597, the Dutch explorer Cornelis de Houtman arrived at Bali, the Dutch East India Company was established in 1602; the Dutch government expanded its control across the Indonesian archipelago during the second half of the 19th century. Dutch political and economic control over Bali began in the 1840s on the island's north coast, when the Dutch pitted various competing Balinese realms against each other. In the late 1890s, struggles between Balinese kingdoms in the island's south were exploited by the Dutch to increase their control. In June 1860, the famous Welsh naturalist, Alfred Russel Wallace, travelled to Bali from Singapore, landing at Buleleng on the north coast of the island. Wallace's trip to Bali was instrumental in helping him devise his Wallace Line theory; the Wallace Line is a faunal boundary that runs through the strait between Lombok. It has been found to be a boundary between species.
In his travel memoir The Malay Archipelago, Wallace wrote of his experience in Bali, of which has strong mention of the unique Balinese irrigation methods: I was both astonished and delighted.
Indonesia the Republic of Indonesia, is a country in Southeast Asia, between the Indian and Pacific oceans. It is the world's largest island country, with more than seventeen thousand islands, at 1,904,569 square kilometres, the 14th largest by land area and the 7th largest in combined sea and land area. With over 261 million people, it is the world's 4th most populous country as well as the most populous Muslim-majority country. Java, the world's most populous island, is home to more than half of the country's population; the sovereign state is a constitutional republic with an elected parliament. It has 34 provinces. Jakarta, the country's capital, is the second most populous urban area in the world; the country shares land borders with Papua New Guinea, East Timor, the eastern part of Malaysia. Other neighbouring countries include Singapore, the Philippines, Australia and India's Andaman and Nicobar Islands. Despite its large population and densely populated regions, Indonesia has vast areas of wilderness that support a high level of biodiversity.
The country has abundant natural resources like oil and natural gas, tin and gold. Agriculture produces rice, palm oil, coffee, medicinal plants and rubber. Indonesia's major trading partners are China, United States, Japan and India. History of the Indonesian archipelago has been influenced by foreign powers drawn to its natural resources, it has been an important region for trade since at least the 7th century, when Srivijaya and later Majapahit traded with entities from mainland China and the Indian subcontinent. Local rulers absorbed foreign cultural and political models from the early centuries and Hindu and Buddhist kingdoms flourished. Muslim traders and Sufi scholars brought Islam, while European powers brought Christianity and fought one another to monopolise trade in the Spice Islands of Maluku during the Age of Discovery. Although sometimes interrupted by the Portuguese and British, the Dutch were the foremost European power for much of its 350-year presence in the archipelago. In early 20th century, the concept of "Indonesia" as a nation state emerged, independence movements began to take shape.
During the decolonisation of Asia after World War II, Indonesia achieved independence in 1949 following an armed and diplomatic conflict with the Netherlands. Indonesia consists of hundreds of distinct native ethnic and linguistic groups, with the largest—and politically dominant—ethnic group being the Javanese. A shared identity has developed, defined by a national language, ethnic diversity, religious pluralism within a Muslim-majority population, a history of colonialism and rebellion against it. Indonesia's national motto, "Bhinneka Tunggal Ika", articulates the diversity that shapes the country. Indonesia's economy is the world's 16th largest by nominal GDP and the 7th largest by GDP at PPP. Indonesia is a member of several multilateral organisations, including the UN, WTO, IMF and G20, it is a founding member of Non-Aligned Movement, Association of Southeast Asian Nations, Asia-Pacific Economic Cooperation, East Asia Summit, Asian Infrastructure Investment Bank and Organisation of Islamic Cooperation.
The name Indonesia derives from the Greek name of the Indos and the word nesos, meaning "Indian islands". The name dates to the 18th century, far predating the formation of independent Indonesia. In 1850, George Windsor Earl, an English ethnologist, proposed the terms Indunesians—and, his preference, Malayunesians—for the inhabitants of the "Indian Archipelago or Malayan Archipelago". In the same publication, one of his students, James Richardson Logan, used Indonesia as a synonym for Indian Archipelago. However, Dutch academics writing in East Indies publications were reluctant to use Indonesia. After 1900, Indonesia became more common in academic circles outside the Netherlands, native nationalist groups adopted it for political expression. Adolf Bastian, of the University of Berlin, popularised the name through his book Indonesien oder die Inseln des Malayischen Archipels, 1884–1894; the first native scholar to use the name was Ki Hajar Dewantara, when in 1913 he established a press bureau in the Netherlands, Indonesisch Pers-bureau.
Fossils and the remains of tools show that the Indonesian archipelago was inhabited by Homo erectus, known as "Java Man", between 1.5 million years ago and 35,000 years ago. Homo sapiens reached the region around 45,000 years ago. Austronesian peoples, who form the majority of the modern population, migrated to Southeast Asia from what is now Taiwan, they arrived around 4,000 years ago, as they spread through the archipelago, confined the indigenous Melanesians to the far eastern regions. Ideal agricultural conditions and the mastering of wet-field rice cultivation as early as the 8th century BCE allowed villages and small kingdoms to flourish by the first century CE; the archipelago's strategic sea-lane position fostered inter-island and international trade, including links with Indian kingdoms and Chinese dynasties, which were established several centuries BCE. Trade has since fundamentally shaped Indonesian history. From the 7th century CE, the powerful Srivijaya naval kingdom flourished as a result of trade and the influences of Hinduism and Buddhism that were imported with it.
Between the 8th and 10th century CE, the agricultural Buddhist Saile
Honey is a sweet, viscous food substance produced by bees and some related insects. Bees produce honey from the sugary secretions of plants or from secretions of other insects, by regurgitation, enzymatic activity, water evaporation. Bees store honey in wax structures called a honeycomb; the variety of honey produced by honey bees is the best-known, due to its worldwide commercial production and human consumption. Honey is collected from wild bee colonies, or from hives of domesticated bees, a practice known as beekeeping or apiculture. Honey gets its sweetness from the monosaccharides fructose and glucose, has about the same relative sweetness as sucrose, it has attractive chemical properties for a distinctive flavor when used as a sweetener. Most microorganisms do not grow in honey, so sealed honey does not spoil after thousands of years. Honey provides 46 calories in a serving of one tablespoon. Honey is regarded as safe. Honey use and production have a long and varied history as an ancient activity.
Several cave paintings in Cuevas de la Araña, depict humans foraging for honey at least 8,000 years ago. Honey is produced by bees collecting nectar for use as sugars consumed to support metabolism of muscle activity during foraging or to be stored as a long-term food supply. During foraging, bees access part of the nectar collected to support metabolic activity of flight muscles, with the majority of collected nectar destined for regurgitation and storage as honey. In cold weather or when other food sources are scarce and larval bees use stored honey as food. By contriving for bee swarms to nest in human-made hives, people have been able to semidomesticate the insects and harvest excess honey. In the hive or in a wild nest, the three types of bees are: a single female queen bee a seasonally variable number of male drone bees to fertilize new queens 20,000 to 40,000 female worker beesLeaving the hive, a foraging bee collects sugar-rich flower nectar, sucking it through its proboscis and placing it in its proventriculus, which lies just dorsal to its food stomach.
The honey stomach holds about 40 mg of nectar, or 50% of the bee's unloaded weight, which can require over a thousand flowers and more than an hour to fill. The nectar begins with a water content of 70 to 80%. Salivary enzymes and proteins from the bee's hypopharyngeal gland are added to the nectar to begin breaking down the sugars, raising the water content slightly; the forager bees return to the hive, where they regurgitate and transfer nectar to the hive bees. The hive bees use their honey stomachs to ingest and regurgitate the nectar, forming bubbles between their mandibles until it is digested; the bubbles create a large surface area per volume and a portion of the water is removed through evaporation. Bee digestive enzymes hydrolyze sucrose to a mixture of glucose and fructose, break down other starches and proteins, increasing the acidity; the bees work together as a group with the regurgitation and digestion for as long as 20 minutes, passing the nectar from one bee to the next, until the product reaches the honeycombs in storage quality.
It is placed in honeycomb cells and left unsealed while still high in water content and natural yeasts which, would cause the sugars in the newly formed honey to ferment. Bees are some of the few insects that can generate large amounts of body heat, thus the hive bees regulate the hive temperature, either heating with their bodies or cooling with water evaporation, to maintain a constant temperature in the honey-storage areas around 35 °C; the process continues as hive bees flutter their wings to circulate air and evaporate water from the honey to a content around 18%, raising the sugar concentration beyond the saturation point and preventing fermentation. The bees cap the cells with wax to seal them; as removed from the hive by a beekeeper, honey has a long shelf life and will not ferment if properly sealed. Another source of honey is from a number of wasp species, such as Brachygastra lecheguana and Brachygastra mellifica, which are found in South and Central America; these species are known to produce honey.
Some wasps, such as Polistes versicolor consume honey themselves, alternating between feeding on pollen in the middle of their lifecycles and feeding on honey, which can better provide for their energy needs. Honey is collected from domesticated beehives. On average, a hive will produce about 65 pounds of honey per year. Wild bee nests are sometimes located by following a honeyguide bird. To safely collect honey from a hive, beekeepers pacify the bees using a bee smoker; the smoke triggers a feeding instinct, making them less aggressive and the smoke obscures the pheromones the bees use to communicate. The honeycomb is removed from the hive and the honey may be extracted from that, either by crushing or by using a honey extractor; the honey is usually filtered to remove beeswax and other debris. Before the invention of removable frames, bee colonies were sacrificed to conduct the harvest; the harvester would replace the entire colony the next spring. Since the invention of removable frames, the principles of husbandry led most beekeepers to ensure that their bees have enough stores to survive the winter, either by leaving some honey in the beehive or by providing the colony with a honey substitute such as sugar water or crystalline sugar.
The amount o
An island or isle is any piece of sub-continental land, surrounded by water. Small islands such as emergent land features on atolls can be called islets, cays or keys. An island in a river or a lake island may be called an eyot or ait, a small island off the coast may be called a holm. A grouping of geographically or geologically related islands is called an archipelago, such as the Philippines. An island may be described despite the presence of an artificial land bridge; some places may retain "island" in their names for historical reasons after being connected to a larger landmass by a land bridge or landfill, such as Coney Island and Coronado Island, though these are speaking, tied islands. Conversely, when a piece of land is separated from the mainland by a man-made canal, for example the Peloponnese by the Corinth Canal or Marble Hill in northern Manhattan during the time between the building of the United States Ship Canal and the filling-in of the Harlem River which surrounded the area, it is not considered an island.
There are two main types of islands in the sea: oceanic. There are artificial islands; the word island derives from Middle English iland, from Old English igland. However, the spelling of the word was modified in the 15th century because of a false etymology caused by an incorrect association with the etymologically unrelated Old French loanword isle, which itself comes from the Latin word insula. Old English ieg is a cognate of Swedish ö and German Aue, related to Latin aqua. Greenland is the world's largest island, with an area of over 2.1 million km2, while Australia, the world's smallest continent, has an area of 7.6 million km2, but there is no standard of size that distinguishes islands from continents, or from islets. There is a difference between continents in terms of geology. Continents are the largest landmass of a particular continental plate. By contrast, islands are either extensions of the oceanic crust, or belong to a continental plate containing a larger landmass. Continental islands are bodies of land.
Examples are Borneo, Sumatra, Sakhalin and Hainan off Asia. A special type of continental island is the microcontinental island, created when a continent is rifted. Examples are Madagascar and Socotra off Africa, New Caledonia, New Zealand, some of the Seychelles. Another subtype is an island or bar formed by deposition of tiny rocks where water current loses some of its carrying capacity; this includes: barrier islands, which are accumulations of sand deposited by sea currents on the continental shelves fluvial or alluvial islands formed in river deltas or midstream within large rivers. While some are transitory and may disappear if the volume or speed of the current changes, others are stable and long-lived. Islets are small islands. Oceanic islands are islands; the vast majority are volcanic in origin, such as Saint Helena in the South Atlantic Ocean. The few oceanic islands that are not volcanic are tectonic in origin and arise where plate movements have lifted up the ocean floor above the surface.
Examples are Saint Paul Rocks in the Atlantic Ocean and Macquarie Island in the Pacific. One type of volcanic oceanic island is found in a volcanic island arc; these islands arise from volcanoes. Examples are the Aleutian Islands, the Mariana Islands, most of Tonga in the Pacific Ocean; the only examples in the Atlantic Ocean are some of the Lesser Antilles and the South Sandwich Islands. Another type of volcanic oceanic island occurs. There are two examples: Iceland, the world's second largest volcanic island, Jan Mayen. Both are in the Atlantic. A third type of volcanic oceanic island is formed over volcanic hotspots. A hotspot is more or less stationary relative to the moving tectonic plate above it, so a chain of islands results as the plate drifts. Over long periods of time, this type of island is "drowned" by isostatic adjustment and eroded, becoming a seamount. Plate movement across a hot-spot produces a line of islands oriented in the direction of the plate movement. An example is the Hawaiian Islands, from Hawaii to Kure, which continue beneath the sea surface in a more northerly direction as the Emperor Seamounts.
Another chain with similar orientation is the Tuamotu Archipelago. The southernmost chain is the Austral Islands, with its northerly trending part the atolls in the nation of Tuvalu. Tristan da Cunha is an example of a hotspot volcano in the Atlantic Ocean. Another hotspot in the Atlantic is the island of Surtsey, formed in 1963. An atoll is an island formed from a coral reef that has grown on an eroded and submerged volcanic island; the reef forms a new island. Atolls are ring-shaped with a central lagoon. Examples are the Line Islands