1.
Palau
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Palau, officially the Republic of Palau, is an island country located in the western Pacific Ocean. The country contains approximately 250 islands, forming the western chain of the Caroline Islands in Micronesia, the most populous island is Koror. The capital Ngerulmud is located on the island of Babeldaob. Palau shares maritime boundaries with Indonesia, the Philippines, and the Federated States of Micronesia, the country was originally settled approximately 3,000 years ago by migrants from the Philippines and sustained a Negrito population until around 900 years ago. The islands were first explored by Europeans in the 16th century, the Imperial Japanese Navy conquered Palau during World War I, and the islands were later made a part of the Japanese-ruled South Pacific Mandate by the League of Nations. During World War II, skirmishes, including the major Battle of Peleliu, were fought between American and Japanese troops as part of the Mariana and Palau Islands campaign. Along with other Pacific Islands, Palau was made a part of the United States-governed Trust Territory of the Pacific Islands in 1947. Having voted against joining the Federated States of Micronesia in 1979, politically, Palau is a presidential republic in free association with the United States, which provides defense, funding, and access to social services. Legislative power is concentrated in the bicameral Palau National Congress, Palaus economy is based mainly on tourism, subsistence agriculture and fishing, with a significant portion of gross national product derived from foreign aid. The country uses the United States dollar as its currency, the islands culture mixes Micronesian, Melanesian, Asian, and Western elements. Ethnic Palauans, the majority of the population, are of mixed Micronesian, Melanesian, a smaller proportion of the population is descended from Japanese and Filipino settlers. The countrys two official languages are Palauan and English, with Japanese, Sonsorolese, and Tobian recognised as regional languages. The name for the islands in the Palauan language, Belau, likely derives from either the Palauan word for village, beluu, or from aibebelau, the name Palau entered the English language from the Spanish Los Palaos, via the German Palau. An archaic name for the islands in English was the Pelew Islands and it should not be confused with Pulau, which is a Malay word meaning island. Palau was originally settled between the 3rd and 2nd millennia BC, most likely from the Austronesia or Indonesia, the islands sustained a population of short-statured Negrito or Pygmy people until the 12th century, when they were replaced. The modern population, judging by its language, may have come from the Sunda Islands, however, the Spanish presence only began to express with evangelization, began at the end of 17th century, and its dominance began to take shape in the 18th century. The conscious discovery of Palau came a century later in 1697 and they were interviewed by the Czech missionary Paul Klein on 28 December 1696. Klein was able to draw the first map of Palau based on the Palauans representation of their home islands that made with an arrangement of 87 pebbles on the beach
2.
Micronesia
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Micronesia is a subregion of Oceania, comprising thousands of small islands in the western Pacific Ocean. It has a cultural history with two other island regions, Polynesia to the east and Melanesia to the south. The region has a marine climate, and is part of the Oceania ecozone. There are four main archipelagos along with numerous outlying islands, Micronesia is divided politically among several sovereign countries. One of these is the Federated States of Micronesia, which is often called Micronesia for short and is not to be confused with the overall region, Micronesia began to be settled several millennia ago, although there are competing theories about the origin and arrival of the first settlers. The earliest known contact with Europeans occurred in 1521, when Ferdinand Magellan reached the Marianas, the coinage of the term Micronesia is usually attributed to Jules Dumont dUrvilles usage in 1832, however Domeny de Rienzi had used the term a year previously. Micronesia is a region that includes approximately 2100 islands, with a land area of 2,700 km2, the largest of which is Guam. The total ocean area within the perimeter of the islands is 7,400,000 km2, there are four main island groups in Micronesia, the Caroline Islands the Gilbert Islands the Mariana Islands the Marshall Islands Plus the island country of Nauru. The Caroline Islands are a widely scattered archipelago consisting of about 500 small coral islands, north of New Guinea, the Gilbert Islands are a chain of sixteen atolls and coral islands, arranged in an approximate north-to-south line. In a geographical sense, the equator serves as the line between the northern Gilbert Islands and the southern Gilbert Islands. The Republic of Kiribati contains all of the Gilberts, as well as the island of Tarawa, the Mariana Islands are an arc-shaped archipelago made up by the summits of fifteen volcanic mountains. Guam and the Northern Marianas are two of the five remaining U. S, the Marshall Islands is an island country, located north of Nauru and Kiribati, east of the Federated States of Micronesia, and south of the U. S. territory of Wake Island. The country consists of 29 low-lying atolls and 5 isolated islands, comprising 1,156 individual islands, the atolls and islands form two groups, the Ratak Chain and the Ralik Chain. All the islands in the chain are part of the Republic of the Marshall Islands, having few natural resources, the islands wealth is based on a service economy, as well as some fishing and agriculture. Of the 29 atolls,24 of them are inhabited, Bikini Atoll is an atoll in the Marshall Islands. There are 23 islands in the Bikini Atoll, the islands of Bokonijien, Aerokojlol, and Nam were vaporized during nuclear tests that occurred there. The islands are composed of low coral limestone аnd sand, the average elevation is only about 2.1 metres above low tide level. Nauru is an island country in the southwestern Pacific Ocean,42 km south of the Equator, listed as the worlds smallest republic
3.
Christmas
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In several countries, celebrating Christmas Eve on December 24 has the main focus rather than December 25, with gift-giving and sharing a traditional meal with the family. Although the month and date of Jesus birth are unknown, by the fourth century the Western Christian Church had placed Christmas on December 25. Today, most Christians celebrate on December 25 in the Gregorian calendar and this is not a disagreement over the date of Christmas as such, but rather a preference of which calendar should be used to determine the day that is December 25. Although it is not known why December 25 became a date of celebration, December 25 was the date the Romans marked as the winter solstice, the shortest, and therefore darkest day of the year. Jesus was identified with the Sun based on an Old Testament verse, the date is exactly nine months following Annunciation, when the conception of Jesus is celebrated. Finally, the Romans had a series of pagan festivals near the end of the year, so Christmas may have been scheduled at this time to appropriate, or compete with, one or more of these festivals. The celebratory customs associated in various countries with Christmas have a mix of pre-Christian, Christian, the economic impact of Christmas has grown steadily over the past few centuries in many regions of the world. Christmas is a form of Christs mass. It is derived from the Middle English Cristemasse, which is from Old English Crīstesmæsse, crīst is from Greek Khrīstos, a translation of Hebrew Māšîaḥ, Messiah, meaning anointed, and mæsse is from Latin missa, the celebration of the Eucharist. The form Christenmas was also used, but is now considered archaic and dialectal, it derives from Middle English Cristenmasse. In addition to Christmas, the holiday has been known by other names throughout its history. The Anglo-Saxons referred to the feast as midwinter, or, more rarely, Nativity, meaning birth, is from Latin nātīvitās. In Old English, Gēola referred to the corresponding to December and January. Noel entered English in the late 14th century and is from the Old French noël or naël, itself ultimately from the Latin nātālis, the canonical gospels of Luke and Matthew both describe Jesus as being born in Bethlehem in Judea, to a virgin mother. In the Gospel of Luke account, Joseph and Mary travel from Nazareth to Bethlehem for the census and it says that angels proclaimed him a savior for all people, and shepherds came to adore him. In the Matthew account, magi follow a star to Bethlehem to bring gifts to Jesus, King Herod orders the massacre of all the boys less than two years old in Bethlehem, but the family flees to Egypt and later settles in Nazareth. The Nativity stories of Matthew and Luke are prominent in the gospels, the first recorded Christmas celebration was in Rome in 336. Christmas played a role in the Arian controversy of the fourth century, the feast regained prominence after 800, when Charlemagne was crowned emperor on Christmas Day
4.
United States
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Forty-eight of the fifty states and the federal district are contiguous and located in North America between Canada and Mexico. The state of Alaska is in the northwest corner of North America, bordered by Canada to the east, the state of Hawaii is an archipelago in the mid-Pacific Ocean. The U. S. territories are scattered about the Pacific Ocean, the geography, climate and wildlife of the country are extremely diverse. At 3.8 million square miles and with over 324 million people, the United States is the worlds third- or fourth-largest country by area, third-largest by land area. It is one of the worlds most ethnically diverse and multicultural nations, paleo-Indians migrated from Asia to the North American mainland at least 15,000 years ago. European colonization began in the 16th century, the United States emerged from 13 British colonies along the East Coast. Numerous disputes between Great Britain and the following the Seven Years War led to the American Revolution. On July 4,1776, during the course of the American Revolutionary War, the war ended in 1783 with recognition of the independence of the United States by Great Britain, representing the first successful war of independence against a European power. The current constitution was adopted in 1788, after the Articles of Confederation, the first ten amendments, collectively named the Bill of Rights, were ratified in 1791 and designed to guarantee many fundamental civil liberties. During the second half of the 19th century, the American Civil War led to the end of slavery in the country. By the end of century, the United States extended into the Pacific Ocean. The Spanish–American War and World War I confirmed the status as a global military power. The end of the Cold War and the dissolution of the Soviet Union in 1991 left the United States as the sole superpower. The U. S. is a member of the United Nations, World Bank, International Monetary Fund, Organization of American States. The United States is a developed country, with the worlds largest economy by nominal GDP. It ranks highly in several measures of performance, including average wage, human development, per capita GDP. While the U. S. economy is considered post-industrial, characterized by the dominance of services and knowledge economy, the United States is a prominent political and cultural force internationally, and a leader in scientific research and technological innovations. In 1507, the German cartographer Martin Waldseemüller produced a map on which he named the lands of the Western Hemisphere America after the Italian explorer and cartographer Amerigo Vespucci
5.
Mokil Atoll
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Mwoakilloa is an inhabited atoll in the central Pacific Ocean. Geographically, it belongs to the Caroline Islands and is a district of the islands of Pohnpei of the Federated States of Micronesia. Mwoakilloa lies 153 kilometres east of Pohnpei and approximately 113 kilometres northwest of Pingelap, the almost-rectangular atoll is 4.5 kilometres long and 2.8 kilometres broad. The atoll consists of the three islands Uhrek, Kahlap, and Mwandohn, forming a lagoon of approximately 2 square kilometres in area. Only the northeast island Kahlap is inhabited, with the town facing the lagoon, the total area of all islands is approximately 1.24 square kilometres. The population of Mwoakilloa decreased from 177 in 2000 to 147 in 2008, the inhabitants speak Mokilese — similar to the Pohnpeian language in the family of Micronesian languages. The name Wellington Island comes from the vessel Marquis of Wellington, the Marquis of Wellington was on her way to China, having transported 200 or so convicts to Port Jackson, Australia, from Britain. Mokil on Oceandots at the Wayback Machine Mokil in the German Colonial Lexicon A map of the Mokil atoll
6.
United States Department of Defense
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The Department is the largest employer in the world, with nearly 1.3 million active duty servicemen and women as of 2016. Adding to its employees are over 801,000 National Guardsmen and Reservists from the four services and it is headquartered at the Pentagon in Arlington, Virginia, just outside of Washington, D. C. The Department of Defense is headed by the Secretary of Defense, Military operations are managed by nine regional or functional Unified Combatant Commands. The Department of Defense also operates several joint services schools, including the National Defense University, the history of the defense of the United States started with the Continental Congress in 1775. The creation of the United States Army was enacted on 14 June 1775 and this coincides with the American holiday Flag Day. The Second Continental Congress would charter the United States Navy, on 13 October 1775, today, both the Navy and the Marine Corps are separate military services subordinate to the Department of the Navy. The Preamble of the United States Constitution gave the authority to federal government, to defend its citizens and this first Congress had a huge agenda, that of creating legislation to build a government for the ages. Legislation to create a military defense force stagnated, two separate times, President George Washington went to Congress to remind them of their duty to establish a military. In a special message to Congress on 19 December 1945, the President cited both wasteful military spending and inter-departmental conflicts, deliberations in Congress went on for months focusing heavily on the role of the military in society and the threat of granting too much military power to the executive. The act placed the National Military Establishment under the control of a single Secretary of Defense, the National Military Establishment formally began operations on 18 September, the day after the Senate confirmed James V. Forrestal as the first Secretary of Defense. The National Military Establishment was renamed the Department of Defense on 10 August 1949, under the Department of Defense Reorganization Act of 1958, channels of authority within the department were streamlined, while still maintaining the authority of the Military Departments. Also provided in this legislation was a centralized authority, the Advanced Research Projects Agency. The Act moved decision-making authority from the Military Departments to the Joint Chiefs of Staff and it also strengthened the command channel of the military over U. S. forces from the President to the Secretary of Defense. Written and promoted by the Eisenhower administration, it was signed into law 6 August 1958, because the Constitution vests all military authority in Congress and the President, the statutory authority of the Secretary of Defense is derived from their constitutional authorities. Department of Defense Directive 5100.01 describes the relationships within the Department. The latest version, signed by former Secretary of Defense Robert Gates in December 2010, is the first major re-write since 1987, the Office of the Secretary of Defense is the Secretary and Deputy Secretarys civilian staff. S. Government departments and agencies, foreign governments, and international organizations, OSD also performs oversight and management of the Defense Agencies and Department of Defense Field Activities. OSD also supervises the following Defense Agencies, Several defense agencies are members of the United States Intelligence Community and these are national-level intelligence services that operate under the jurisdiction of the Department of Defense but simultaneously fall under the authorities of the Director of National Intelligence
7.
Guam
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Guam is an unincorporated and organized territory of the United States. Located in the western Pacific Ocean, Guam is one of five American territories with a civilian government. The capital city is Hagåtña and the most populous city is Dededo, in 2015,161,785 people resided on Guam. Guamanians are American citizens by birth, Guam has an area of 210 sq mi and a population density of 770/sq mi. It is the largest and southernmost of the Mariana Islands and the largest island in Micronesia, among its municipalities, Mongmong-Toto-Maite has the highest density at 3, 691/sq mi, whereas Inarajan and Umatac have the lowest density at 119/sq mi. The highest point is Mount Lamlam at 406 meters above sea level, the Chamorros, Guams indigenous people, settled the island approximately 4,000 years ago. Portuguese explorer Ferdinand Magellan was the first European to visit the island on March 6,1521, Guam was colonized in 1668 with settlers, like Diego Luis de San Vitores, a Catholic missionary. Between the 16th century and the 18th century, Guam was an important stopover for the Spanish Manila Galleons, during the Spanish–American War, the United States captured Guam on June 21,1898. Under the Treaty of Paris, Spain ceded Guam to the United States on December 10,1898, Guam is among the seventeen Non-Self-Governing Territories of the United Nations. Before World War II, Guam and three other territories – American Samoa, Hawaii, and the Philippines – were the only American jurisdictions in the Pacific Ocean. On December 7,1941, hours after the attack on Pearl Harbor, Guam was captured by the Japanese, during the occupation, Guamanians were subjected to beheadings, forced labor, rape, and torture. Guam endured hostilities when American forces recaptured the island on July 21,1944, since the 1960s, the economy is supported by two industries, tourism and the United States Armed Forces. The original inhabitants of Guam and the Northern Mariana Islands are believed to be descendants of Austronesian people originating from Southeast Asia as early as 2000 BC and they evolved into the Chamorro people. The ancient-Chamorro society had four classes, chamorri, matua, achaot, the matua were located in the coastal villages, which meant they had the best access to fishing grounds, whereas the manachang were located in the interior of the island. Matua and manachang rarely communicated with other, and matua often used achaot as intermediaries. There were also makåhna, skilled in healing and medicine, belief in spirits of ancient Chamorros called Taotao mona still persists as a remnant of pre-European culture. Their society was organized along matrilineal clans, Latte stones are stone pillars that are found only in the Mariana Islands, and, they are a recent development in Pre-Contact Chamorro society. The latte-stone was used as a foundation on which thatched huts were built, Latte stones consist of a base shaped from limestone called the haligi and with a capstone, or tåsa, made either from a large brain coral or limestone, placed on top
8.
Andersen Air Force Base
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Andersen Air Force Base is a United States Air Force base located approximately 4 miles northeast of Yigo near Agafo Gumas in the United States territory of Guam. Along with Naval Base Guam, Andersen AFB was placed under the command of Joint Region Marianas on 1 October 2009, the two bases are about 30 miles away at opposite ends of the island. Administration offices for Joint Region Marianas are about half-way in between, at Nimitz Hill, the host unit at Andersen AFB is the 36th Wing, assigned to the Pacific Air Forces Thirteenth Air Force. A non-flying wing, the 36 WGs mission is to support to deployed air and space forces of USAF and foreign air forces to Andersen. Andersen AFB was established in 1944 as North Field and is named for Brigadier General James Roy Andersen, the 36th Wing Commander is Brig. Gen. Douglas A. Cox. The Vice Wing Commander is Colonel Scott Hurrelbrink and the Command Chief Master Sergeant is Chief Master Sergeant Orlando Ureña, Andersen is one of four bomber forward operating locations in the US Air Force. These locations provide forward support to bomber crews deploying overseas in Europe, Southwest Asia, the Air Force is establishing forward-deployed bomber beddown support at key locations throughout the world and Andersen is one of two critical bases in the Asia-Pacific region. The other location is Diego Garcia in the Indian Ocean, Guams almost unrestricted airspace and the close proximity of the Farallon de Medinilla Island, a naval bombing range 184 miles north, makes this an ideal training environment. General Andersen graduated from the United States Military Academy in 1926, served at various army installations, during 1943–1944 he served on the War Department General Staff. In January 1945, General Andersen was assigned to HQ AAF and he died on 26 February 1945 in the crash of a B-24 Liberator aircraft between Kwajalein and Johnston Island while en route to Hawaii. Andersen Air Force Bases origins begin on 7 December 1941 when Guam was attacked by the forces of Imperial Japan in the Battle of Guam three hours after the Attack on Pearl Harbor. The United States Navy surrendered Guam to the Japanese on 10 December, at the height of the war, approximately 19,000 Japanese soldiers and sailors were deployed to the island. Guam was liberated by the United States Marine Corps 3rd Amphibious Corps on 21 July 1944, in the Battle of Guam, the Japanese managed to contain the marines on two beachheads, but their counter-attack failed. The marines renewed their assault, and reached the tip of the island on 10 August 1944. Japanese guerrilla activities continued until the end of the war, Guam was considered as being ideal to establish air bases to launch B-29 Superfortress operations against the Japanese Home Islands. The Marianas Islands are about 1,500 miles from Tokyo, most important of all, it could be put on a direct supply line from the United States by ship. North Field, as Andersen AFB was first named, was the first air base built on Guam after its liberation, the first host unit at North Field was the 314th Bombardment Wing, XXI Bomber Command, Twentieth Air Force. The 314th arrived on Guam on 16 January 1945 from Peterson Field, the 314th controlled four operational B-29 bomb groups, the 19th, 29th, 39th, and 330th
9.
Yokota Air Base
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Yokota Air Base, is a United States Air Force base in the city of Fussa, one of 26 cities in the Tama Area, or Western Tokyo. The base occupies an area of 7.07 km2 and has a 3,353 m ×61 m runway. The host unit at Yokota is the 374th Airlift Wing and is used for airlift missions throughout East Asia. The 374th includes four groups, operations, mission support, maintenance, each group manages a various number of squadrons in order to carry out the wings mission. 374th Operations Group The 374th Operations Group maintains a presence by providing rapid responsive movement of personnel, equipment. 374th Maintenance Group The 374th Maintenance Group maintains C-130H1, C-12 and UH-1N aircraft supporting intratheater airlift, 374th Medical Group The 374th Medical Group, ensures medical readiness of 374 AW,5 AF, and US Forces Japan personnel. They also maintain 64 War Reserve Materiel projects, including the USAFs largest Patient Movement Item inventory, associate/Tenant Units U. S. Forces, Japan -- a nonoperational, politico-military unit that serves as the USPACOM front for US-Japanese military discussions. Fifth Air Force -- the air component to USFJ, 730th Air Mobility Squadron Air Force Band of the Pacific-Asia Stars & Stripes American Forces Network U. S. Coast Guard Activities Far East. Yokota Cadet Squadron, Civil Air Patrol The Civil Air Patrols Yokota Cadet Squadron conducts operations at Yokota Air Base, the newly renovated Air Mobility Command Passenger Terminal is on the main part of the base next to the flightline. The facility which houses Yokota Air Base was originally constructed by the Imperial Japanese Army in 1940 as Tama Airfield, and used as a flight test center. During World War II Yokota became the center of Japanese Army Air Forces flight test activities, Tama was first identified by United States military forces in November 1944 by a 3d Reconnaissance Squadron F-13 Superfortress photo-reconnaissance aircraft, flying from Tinian in the Marianas. It was identified as being associated with a nearby Musashino-Nakajima aircraft manufacturing plant, along with the Showa Air Base to the northwest, and Tachikawa Air Base to the east, it was compared to the aircraft development complex of the USAAF Wright-Paterson Field in Ohio. According to the USAAF intelligence at the time, the three bases conducted all IJA flight testing, in the spring of 1945, XXI Bomber Command attacked the base eight times along with the aircraft manufacturing plant, but each time heavy clouds forced the bombers to attack secondary targets. The Nakajima plant was attacked in April 1945, but the Tama airfield never was bombed. With the end of hostilities and the Japanese surrender in September 1945, the airfields buildings were largely intact, and some 280 of the IJAs most modern aircraft were discovered in hangars. When the old runway deteriorated under heavy usage, the runway was repaired, additional construction during the 1940s and 1950s was completed and the base reached its current size around 1960. On the occasion of extension, the course of Hachiko Line and national highway Route 16 was changed, 6th Night Fighter Squadron Inactivated and personnel, mission and equipment transferred to 339th Fighter Squadron with F-82F/G Twin Mustangs at Nagoya AB Japan. During the Korean War, Yokota was used for missions over North and South Korea
10.
Boeing B-29 Superfortress variants
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The Boeing B-29 Superfortress was produced in a large number of experimental and production models. Two aircraft were ordered in August 1940, and a third was ordered in December, a mockup was completed in the spring of 1941, and it first flew on September 21,1942. Testing continued until February 18,1943, when the prototype crashed. Flown by Boeings chief test pilot, Edmund T, eddie Allen on a two-hour powerplant performance test, leaking fuel from a filler cap in the wing leading edge ran down inside the leading-edge and ignited, spreading to the engines. The crash killed many élite Boeing personnel involved in the design, the YB-29 was an improved XB-29 and 14 were built for service testing. Testing began in the summer of 1943, and dozens of modifications were made to the planes, the engines were upgraded from Wright R-3350-13s to R-3350-21s. Where the XB-29 had three-bladed props, the YB-29 had four-bladed propellers, various alternatives to the remote-controlled defensive systems were tested on a number of them, particularly the fourth one delivered. After alternative arrangements had been tested, defensive armament was standardised at ten. 50-calibre machine guns in turret-mounted pairs. The YB-29 also featured a fire control system. The B-29 was the production version of the Superfortress. Since the new bomber was urgently needed, the design was developed in tandem with the service testing. In fact, the first B-29 was completed two months after the delivery of the first YB-29. Forty-six B-29s of this variant, built by the Glenn L. Martin Company at its Omaha plant, were used as the aircraft for the atomic bomb missions, some 2,513 B-29s were manufactured by Boeing-Wichita, Bell-Atlanta, and Martin-Omaha. Section source, Baugher and The B-29A was a version of the original B-29 production model. All 1,119 B-29As were built at the Boeing plant in Renton, Washington, enhancements made in the B-29A included a better wing design and defensive modifications. Due to a weakness to head-on fighter attacks, the number of machine guns in the forward dorsal turrets was doubled to four. Where the wings of previous models had been made by the sub-assembly of two sections, the B-29A wing was built up from three and this made construction easier, and increased the strength of the airframe. The B-29A was produced until May 1946, when the last aircraft was completed and it was much used during the Korean War, but was quickly phased out when the jet bomber became operational
11.
Atoll
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An atoll, sometimes called a coral atoll, is a ring-shaped coral reef including a coral rim that encircles a lagoon partially or completely. There may be coral islands/cays on the rim, the coral of the atoll often sits atop the rim of an extinct seamount or volcano which has eroded or subsided partially beneath the water. The lagoon forms over the crater or caldera while the higher rim remains above water or at shallow depths that permit the coral to grow. For the atoll to persist, continued erosion or subsidence must be at a slow enough to permit reef growth upwards and outwards to replace the lost height. The word atoll comes from the Dhivehi word atholhu, meaning an administrative subdivision, the distribution of atolls around the globe is instructive, most of the worlds atolls are in the Pacific Ocean and Indian Ocean. The Atlantic Ocean has no large groups of atolls, other than eight atolls east of Nicaragua that belong to the Colombian department of San Andres and Providencia in the Caribbean. Reef-building corals will thrive only in tropical and subtropical waters of oceans and seas. The northernmost atoll of the world is Kure Atoll at 28°24 N, the southernmost atolls of the world are Elizabeth Reef at 29°58 S, and nearby Middleton Reef at 29°29 S, in the Tasman Sea, both of which are part of the Coral Sea Islands Territory. The next southerly atoll is Ducie Island in the Pitcairn Islands Group, at this latitude coral reefs would not develop without the warming waters of the Gulf Stream. However, Bermuda is termed a pseudo-atoll because its general form, while there is no atoll directly on the equator, the closest atoll to the Equator is Aranuka of Kiribati, with its southern tip just 12 km north of the equator. In most cases, the area of an atoll is very small in comparison to the total area. Atoll islands are low lying, with their elevations less than 5 meters, measured by total area, Lifou is the largest raised coral atoll of the world, followed by Rennell Island. More sources however list as the largest atoll in the world in terms of land area Kiritimati, the remains of an ancient atoll as a hill in a limestone area is called a reef knoll. The second largest atoll by dry land area is Aldabra with 155 km², the largest atoll in terms of island numbers is Huvadhu Atoll in the south of the Maldives with 255 islands. In 1842, Charles Darwin explained the creation of coral atolls in the southern Pacific Ocean based upon observations made during a voyage aboard the HMS Beagle from 1831 to 1836. In time, subsidence carries the old volcano below the ocean surface, at this point, the island has become an atoll. Atolls are the product of the growth of marine organisms. Volcanic islands located beyond the water temperature requirements of hermatypic organisms become seamounts as they subside and are eroded away at the surface
12.
Parachute
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A parachute is a device used to slow the motion of an object through an atmosphere by creating drag. Parachutes are usually out of light, strong cloth, originally silk. Parachutes often take the shape of a dome, but shapes may vary including some taking the shape of an inverted dome, depending on the situation, parachutes are used with a variety of loads, including people, food, equipment, space capsules, and bombs. Drogue chutes are used to aid horizontal deceleration of a vehicle, the earliest evidence for the parachute dates back to the Renaissance period. The oldest parachute design appears in a manuscript from 1470s Renaissance Italy. As a safety measure, four straps run from the ends of the rods to a waist belt, shortly after, a more sophisticated parachute was sketched by the polymath Leonardo da Vinci in his Codex Atlanticus dated to ca. Here, the scale of the parachute is in a more favorable proportion to the weight of the jumper, Leonardos canopy was held open by a square wooden frame, which alters the shape of the parachute from conical to pyramidal. It is not known whether the Italian inventor was influenced by the earlier design, the feasibility of Leonardos pyramidal design was successfully tested in 2000 by Briton Adrian Nicholas and again in 2008 by the Swiss skydiver Olivier Vietti-Teppa. The Croatian polymath and inventor Faust Vrančić examined da Vincis parachute sketch and he kept the square frame, but replaced the canopy with a bulging sail-like piece of cloth that he came to realize decelerates the fall more effectively. However, in book, John Wilkins wrote about flying. The modern parachute was invented in the late 18th century by Louis-Sébastien Lenormand in France, Lenormand also sketched his device beforehand. Two years later, in 1785, Lenormand coined the word parachute by hybridizing a Latin prefix para, and chute, also in 1785, Jean-Pierre Blanchard demonstrated it as a means of safely disembarking from a hot-air balloon. Subsequent development of the focused on it becoming more compact. In 1797, André Garnerin made the first descent using such a parachute, Garnerin also invented the vented parachute, which improved the stability of the fall. In 1907 Charles Broadwick demonstrated two key advances in the parachute he used to jump from hot air balloons at fairs and he folded his parachute into a pack he wore on his back. And the parachute was pulled from the pack by a line attached to the balloon. When Broadwick jumped from the balloon, the line became taut, pulled the parachute from the pack. In 1911 a successful test took place with a dummy at the Eiffel tower in Paris, the puppets weight was 75 kg, the parachutes weight was 21 kg
United States
