|
Lyra Reef
Lyra Reef is a remote submerged coral atoll, about in diameter, extending over an area of . It lies about north-east of New Ireland in the Bismarck Archipelago of Papua New Guinea, and north-east of Simberi Island, the closest island, and about the same distance north-west of the Nuguria Islands. The depths around the perimeter of the reef are generally less than and in places are less than . The least depth is on its north side. Within the reef, in the lagoon, there are depths of exceeding . A gap on the north-west side of the reef gives access to this deep water. Depths of more than are found within of the reef. See also * List of reefs This is an incomplete list of notable reefs. Reefs See also *Fringing reef *Recreational dive sites *Recreational diving *Southeast Asian coral reefs *''The Structure and Distribution of Coral Reefs ''The Structure and Distribution of Cor ... References External linksNautical chart of Lyra Reef Reefs of Papua New Guinea Co ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Solomon Sea
The Solomon Sea is a sea located within the Pacific Ocean. It lies between Papua New Guinea and Solomon Islands. Many major battles were fought there during World War II. Extent The International Hydrographic Organization defines the limits of the Solomon Sea as follows: ''On the Northwest.'' By the Southeast limit of Bismarck Sea New_Ireland_(island).html" ;"title=" line from the Southern point of New Ireland (island)">New Ireland along the parallel of 4°50' South to the coast of New Britain, along its Northern coast and thence a line from its Western extreme through the Northern point of Umboi Island to Teliata Point, New Guinea ()]. ''On the Northeast.'' By a line from the Southern point of New Ireland to the North point of Buka Island, through this island to the Northwest point of Bougainville Island, along the Southern coasts of Bougainville, Choisel Choiseul">/nowiki>Choiseul Island, Choiseul/nowiki>, Ysabel Santa Isabel/nowiki>, Malaita">anta_Isabel_Island.html" ; ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Papua New Guinea
Papua New Guinea (abbreviated PNG; , ; tpi, Papua Niugini; ho, Papua Niu Gini), officially the Independent State of Papua New Guinea ( tpi, Independen Stet bilong Papua Niugini; ho, Independen Stet bilong Papua Niu Gini), is a country in Oceania that comprises the eastern half of the island of New Guinea and its offshore islands in Melanesia (a region of the southwestern Pacific Ocean north of Australia). Its capital, located along its southeastern coast, is Port Moresby. The country is the world's third largest island country, with an area of . At the national level, after being ruled by three external powers since 1884, including nearly 60 years of Australian administration starting during World War I, Papua New Guinea established its sovereignty in 1975. It became an independent Commonwealth realm in 1975 with Elizabeth II as its queen. It also became a member of the Commonwealth of Nations in its own right. There are 839 known languages of Papua New Guinea, on ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Time In Australia
Australia uses three main time zones: Australian Western Standard Time (AWST; UTC+08:00), Australian Central Standard Time (ACST; UTC+09:30), and Australian Eastern Standard Time (AEST; UTC+10:00). Time is regulated by the individual state governments, some of which observe daylight saving time (DST). Australia's external territories observe different time zones. Standard time was introduced in the 1890s when all of the Australian colonies adopted it. Before the switch to standard time zones, each local city or town was free to determine its local time, called local mean time. Now, Western Australia uses Western Standard Time; South Australia and the Northern Territory use Central Standard Time; while New South Wales, Queensland, Tasmania, Victoria, Jervis Bay Territory, and the Australian Capital Territory use Eastern Standard Time. Daylight saving time (+1 hour) is used in jurisdictions in the south and south-east: South Australia, New South Wales, Victoria, Tasmania, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Atoll
An atoll () is a ring-shaped island, including a coral rim that encircles a lagoon partially or completely. There may be coral islands or cays on the rim. Atolls are located in warm tropical or subtropical oceans and seas where corals can grow. Most of the approximately 440 atolls in the world are in the Pacific Ocean. Two different, well-cited models, the subsidence and antecedent karst models, have been used to explain the development of atolls.Droxler, A.W. and Jorry, S.J., 2021. ''The Origin of Modern Atolls: Challenging Darwin's Deeply Ingrained Theory.'' ''Annual Review of Marine Science'', 13, pp.537-573. According to Charles Darwin's ''subsidence model'', the formation of an atoll is explained by the subsidence of a volcanic island around which a coral fringing reef has formed. Over geologic time, the volcanic island becomes extinct and eroded as it subsides completely beneath the surface of the ocean. As the volcanic island subsides, the coral fringing reef beco ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Diameter
In geometry, a diameter of a circle is any straight line segment that passes through the center of the circle and whose endpoints lie on the circle. It can also be defined as the longest chord of the circle. Both definitions are also valid for the diameter of a sphere. In more modern usage, the length d of a diameter is also called the diameter. In this sense one speaks of diameter rather than diameter (which refers to the line segment itself), because all diameters of a circle or sphere have the same length, this being twice the radius r. :d = 2r \qquad\text\qquad r = \frac. For a convex shape in the plane, the diameter is defined to be the largest distance that can be formed between two opposite parallel lines tangent to its boundary, and the is often defined to be the smallest such distance. Both quantities can be calculated efficiently using rotating calipers. For a curve of constant width such as the Reuleaux triangle, the width and diameter are the same beca ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
New Ireland (island)
New Ireland ( Tok Pisin: ''Niu Ailan'') or Latangai, is a large island in Papua New Guinea, approximately in area with 120,000 people. It is named after the island of Ireland. It is the largest island of New Ireland Province, lying northeast of the island of New Britain. Both islands are part of the Bismarck Archipelago, named after Otto von Bismarck, and they are separated by Saint George's Channel. The administrative centre of the island and of New Ireland province is the town of Kavieng located at the northern end of the island. While the island was part of German New Guinea, it was named Neumecklenburg ("New Mecklenburg"). Geography The island is part of the Bismarck Archipelago and is often described as having the shape of a musket. New Ireland is surrounded by the Bismarck Sea in the southwest and by the Pacific Ocean in the northeast. For much of its in length, the island's width varies between less than to , yet the central mountainous spine is very st ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bismarck Archipelago
The Bismarck Archipelago (, ) is a group of islands off the northeastern coast of New Guinea in the western Pacific Ocean and is part of the Islands Region of Papua New Guinea. Its area is about 50,000 square km. History The first inhabitants of the archipelago arrived around 30–40,000 years ago. They may have traveled from New Guinea, by boat across the Bismarck Sea or via a temporary land bridge, created by an uplift in the Earth's Crust (geology), crust. Later arrivals included the Lapita people. The first European to visit these islands was Dutch explorer Willem Schouten in 1616. The islands remained unsettled by western Europeans until they were annexed as part of the German protectorate of German New Guinea in 1884. The area was named in honour of the Chancellor of Germany (German Reich), Chancellor Otto von Bismarck. On 1888 Ritter Island eruption and tsunami, 13 March 1888, a volcano erupted on Ritter Island causing a megatsunami. Almost the entire volcano fell into t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Simberi Island
Simberi Island is a volcanic island in the Tabar Group, in Papua New Guinea's New Ireland Province. Geography and geology Simberi is the northernmost and smallest of the three islands in the Tabar Group. The island is about 9 km long and 7 km wide and has an area of about 40 square kilometers. Its highest point in the highlands on the eastern side of the island is a 340 m eroded volcanic cone. The interior of the island is largely covered by rainforest. Most of the island's coast is steep and surrounded by a fringing reef together with a series of small islets. There is a woman shaped figure made by trees on the island and a barrier reef about 10 km offshore from the west coast. A 2 km strait separates Simberi from Tatau Island to the south west. Simberi island is a potassium rich (high-K) calc-alkaline island arc volcano, the oldest in the Pliocene to Holocene Tabar-Lihir-Tanga-Feni (TLTF) volcanic arc that formed above a subduction zone. People The populati ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nuguria Islands
Nuguria or the Nuguria Islands, also known as the Abgarris or Fead Islands,Richard Parkinson et al. ''Thirty years in the South Seas'', 1999 are a Polynesian outlier and islands of Papua New Guinea. They are located nearly 150 km from the northern end of Buka island, in the Autonomous Region of Bougainville and consist of two closely spaced atoll An atoll () is a ring-shaped island, including a coral rim that encircles a lagoon partially or completely. There may be coral islands or cays on the rim. Atolls are located in warm tropical or subtropical oceans and seas where corals can ... formations. References External links * Historical commentary from a frequent visitor to Nuguria Momentum {{authority control Islands of Papua New Guinea Polynesian outliers ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lagoon
A lagoon is a shallow body of water separated from a larger body of water by a narrow landform, such as reefs, barrier islands, barrier peninsulas, or isthmuses. Lagoons are commonly divided into '' coastal lagoons'' (or ''barrier lagoons'') and '' atoll lagoons''. They have also been identified as occurring on mixed-sand and gravel coastlines. There is an overlap between bodies of water classified as coastal lagoons and bodies of water classified as estuaries. Lagoons are common coastal features around many parts of the world. Definition and terminology Lagoons are shallow, often elongated bodies of water separated from a larger body of water by a shallow or exposed shoal, coral reef, or similar feature. Some authorities include fresh water bodies in the definition of "lagoon", while others explicitly restrict "lagoon" to bodies of water with some degree of salinity. The distinction between "lagoon" and "estuary" also varies between authorities. Richard A. Davis Jr. rest ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Reefs
This is an incomplete list of notable reefs. Reefs See also *Fringing reef *Recreational dive sites *Recreational diving *Southeast Asian coral reefs *''The Structure and Distribution of Coral Reefs ''The Structure and Distribution of Coral Reefs, Being the first part of the geology of the voyage of the Beagle, under the command of Capt. Fitzroy, R.N. during the years 1832 to 1836'', was published in 1842 as Charles Darwin's first monogr ...'' References {{corals ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Reefs Of Papua New Guinea
A reef is a ridge or shoal of rock, coral or similar relatively stable material, lying beneath the surface of a natural body of water. Many reefs result from natural, abiotic processes— deposition of sand, wave erosion planing down rock outcrops, etc.—but there are also reefs such as the coral reefs of tropical waters formed by biotic processes dominated by corals and coralline algae, and artificial reefs such as shipwrecks and other anthropogenic underwater structures may occur intentionally or as the result of an accident, and sometimes have a designed role in enhancing the physical complexity of featureless sand bottoms, to attract a more diverse assemblage of organisms. Reefs are often quite near to the surface, but not all definitions require this. Earth's largest coral reef system is the Great Barrier Reef in Australia, at a length of over . Biotic There is a variety of biotic reef types, including oyster reefs and sponge reefs, but the most massive and widely ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
