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Kerið
Kerið (; also Kerith or Kerid) is a volcanic Volcanic crater lake, crater lake located in the Grímsnes area in south Iceland, along the Golden Circle (Iceland), Golden Circle. It is one of several crater lakes in the area, known as Iceland's Western Volcanic Zone, which includes the Reykjanes, Reykjanes peninsula and the Langjökull, Langjökull Glacier, created as the land moved over a localized Hotspot (geology), hotspot, but it is the one that has the most visually recognizable caldera still intact. The site is a popular area for tourists in Iceland. Geology Kerið is the northernmost of four craters situated along an 800-meter fissure called the Tjarnarhólar Help:IPA/Icelandic, [ˈtʰja(r)tnarˌhouːlar̥] row. It was formed through explosive volcanic activity (classified as a maar) and is elliptical, measuring approximately deep, wide, and across. The wall of the crater consists of basalt, formed following the cooling of lava, and scoria. Sources differ as to when ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Grímsnes
Grímsnes () is a relatively small fissure vent, fissure or crater row Volcanic systems of Iceland, volcanic system located in South Iceland, located south–east of Þingvallavatn, Lake Thingvallavatn and east of the en echelon group of volcanic systems extending across the Reykjanes Peninsula, that erupted last in the Holocene. Geography The lava fields are spread out to the south-east of the older edifice of Búrfell (Grímsnes), Búrfell being bounded to the east by the water body of Álftavatn , on the river Sog (river), Sog (Sogið) and reaches to the south the confluence of the Sog with the Hvítá (Árnessýsla), Hvítá. From these river boundaries at about the field reaches its highest point at the Seyðishólar cone of . Most of the lava fields are covered by birch and willow. Geology Tephrochronology approximates the volcano's last eruption as about 7000 years ago. There are at least ten vents and all have erupted olivine tholeiite basalt in effusive erupt ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Volcanic Crater Lake
A volcanic crater lake is a lake in a volcanic crater, crater that was formed by explosive eruption, explosive activity or a caldera, collapse during a types of volcanic eruptions, volcanic eruption. Formation Lakes in calderas fill large craters formed by the collapse of a volcano during an eruption. Lakes in maars fill medium-sized craters where an eruption deposited debris around a vent. Crater lakes form as the created depression, within the Rim (craters), crater rim, is filled by water. The water may come from Precipitation (meteorology), precipitation, groundwater circulation (often Hot Spring, hydrothermal fluids in the case of volcanic craters) or melted ice. Its level rises until an equilibrium is reached between the rates of incoming and outgoing water. Sources of water loss singly or together may include evaporation, subsurface seepage, and, in places, surface leakage or overflow when the lake level reaches the lowest point on its rim. At such a saddle location, the u ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Golden Circle (Iceland)
The Golden Circle ( ) is a tourist route in southern Iceland, covering about looping from Reykjavík into the southern uplands of Iceland and back. It is the area that contains most tours and travel-related activities in Iceland. The term for the "Golden Circle" was a marketing tactic developed by the Icelandic Tourism board to improve travel. The three primary stops on the route are the Þingvellir National Park, the Gullfoss waterfall, and the geothermal area in Haukadalur (Bláskógabyggð), Haukadalur, which contains the geysers Geysir and Strokkur, which erupts every 10-15 minutes. Though Geysir has been mostly dormant for many years, Strokkur continues to erupt every 5–10 minutes. Other stops include the Kerið volcanic crater, the town of Hveragerði, Skálholt cathedral, and the Nesjavellir and Hellisheiðarvirkjun geothermal power plants. See also * Diamond Circle References * {{cite web , title=Comprehensive guide on Golden Circle , url=https://www.buubble.co ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dormant Volcanoes
A volcano is commonly defined as a vent or fissure 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. 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, 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 resulting from divergent tectonic activity are usually non-explosive whereas those resulting from convergent tectonic activity cause violent eruptions."Mid-ocean ridge tectonics, volcanism and geomorphology." Geology 26, no. 455 (2001): 458. https://macdonald.faculty.geol.ucsb.edu/papers/Macdonald%20Mid-Ocean%20Ridge%20Tectonics.pdf Volcanoes can also form where there is stretching an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Volcanoes Of Iceland
:''The volcano system in Iceland that started activity on August 17, 2014, and ended on February 27, 2015, is Bárðarbunga.'' :''The volcano in Iceland that erupted in May 2011 is Grímsvötn.'' Iceland experiences frequent volcanic activity, due to its location both on the Mid-Atlantic Ridge, a divergent tectonic plate boundary, and being over a hotspot. Nearly thirty volcanoes are known to have erupted in the Holocene epoch; these include Eldgjá, source of the largest lava eruption in human history. Some of the various eruptions of lava, gas and ash have been both destructive of property and deadly to life over the years, as well as disruptive to local and European air travel. Volcanic systems and volcanic zones of Iceland Holocene volcanism in Iceland is mostly to be found in the ''Neovolcanic Zone'', comprising the Reykjanes volcanic belt (RVB), the West volcanic zone (WVZ), the Mid-Iceland belt (MIB), the East volcanic zone (EVZ) and the North volcanic zone (NVZ). ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Icelandic Króna
The króna () or krona (sometimes called Icelandic crown; currency sign, sign: kr; ISO 4217, code: ISK) is the currency of Iceland. One króna was formerly divided into 100 eyrir (plural "aurar"). Name Like the other Nordic countries, Nordic currencies (such as the Danish krone, Swedish krona and Norwegian krone) that participated in the historical Scandinavian Monetary Union, the name ''króna'' (meaning ''crown'') comes from the Latin language, Latin word ''wiktionary:corona, corona'' ("crown"). The name "Icelandic crown" is sometimes used alternatively, for example in the financial markets. First krona, 1874–1981 The Danish krone was introduced to Iceland in 1874, replacing the earlier Danish currency, the Danish rigsdaler, rigsdaler. In 1885, Iceland began issuing its own banknotes. The Icelandic krona separated from the Danish krone after the dissolution of the Scandinavian Monetary Union at the start of World War I and Icelandic sovereignty from Denmark in 1918. The ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rotifer
The rotifers (, from Latin 'wheel' and 'bearing'), sometimes called wheel animals or wheel animalcules, make up a phylum (Rotifera ) of microscopic and near-microscopic Coelom#Pseudocoelomates, pseudocoelomate animals. They were first described by John Harris (writer), Rev. John Harris in 1696, and other forms were described by Antonie van Leeuwenhoek in 1703. Most rotifers are around long (although their size can range from to over ), and are common in freshwater environments throughout the world with a few Seawater, saltwater species. Some rotifers are free swimming and truly planktonic, others move by inchworming along a substrate, and some are Sessility (zoology), sessile, living inside tubes or gelatinous holdfast (biology), holdfasts that are attached to a substrate. About 25 species are colonial (e.g., ''Sinantherina semibullata''), either sessile or planktonic. Rotifers are an important part of the freshwater zooplankton, being a major foodsource and with many specie ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aquamarine (color)
Aquamarine is a color that is a light tint of teal, in between cyan and green on the color wheel. It is named after the mineral Aquamarine (gem), aquamarine, a gemstone mainly found in granite rocks. The first recorded use of ''aquamarine'' as a color name in English language, English was in 1598.Maerz, Aloys John, and Morris Rea Paul (1930). ''A Dictionary of Color''. New York: McGraw-Hill. p. 190; color sample of aquamarine: p. 93, plate 35, color sample I3. . File:Aquamarine.jpg, alt=Rough aquamarine, Rough Beryl, aquamarine File:Aquamarine P1000141.JPG, alt=Aquamarine crystals on muscovite, Aquamarine crystals on muscovite File:Aquamarine brooch (Faberge).jpg, An aquamarine brooch File:SCHMITZ-PLEIS Dame in Aquamarin 1911.jpg, ''Lady in Aquamarine'' by Carl Schmitz-Pleis, 1911 See also * List of colors References [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Groundwater
Groundwater is the water present beneath Earth's surface in rock and Pore space in soil, soil pore spaces and in the fractures of stratum, rock formations. About 30 percent of all readily available fresh water in the world is groundwater. A unit of rock or an unconsolidated deposit is called an ''aquifer'' when it can yield a usable quantity of water. The depth at which soil pore spaces or fractures and voids in rock become completely saturated with water is called the ''water table''. Groundwater is Groundwater recharge, recharged from the surface; it may discharge from the surface naturally at spring (hydrosphere), springs and Seep (hydrology), seeps, and can form oasis, oases or wetlands. Groundwater is also often withdrawn for agricultural, municipal, and industrial use by constructing and operating extraction water well, wells. The study of the distribution and movement of groundwater is ''hydrogeology'', also called groundwater hydrology. Typically, groundwater is thought o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Basalt
Basalt (; ) is an aphanite, aphanitic (fine-grained) extrusive igneous rock formed from the rapid cooling of low-viscosity lava rich in magnesium and iron (mafic lava) exposed at or very near the planetary surface, surface of a terrestrial planet, rocky planet or natural satellite, moon. More than 90% of all volcanic rock on Earth is basalt. Rapid-cooling, fine-grained basalt is chemically equivalent to slow-cooling, coarse-grained gabbro. The eruption of basalt lava is observed by geologists at about 20 volcanoes per year. Basalt is also an important rock type on other planetary bodies in the Solar System. For example, the bulk of the plains of volcanism on Venus, Venus, which cover ~80% of the surface, are basaltic; the lunar mare, lunar maria are plains of flood-basaltic lava flows; and basalt is a common rock on the surface of Mars. Molten basalt lava has a low viscosity due to its relatively low silica content (between 45% and 52%), resulting in rapidly moving lava flo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Scoria
Scoria or cinder is a pyroclastic, highly vesicular, dark-colored volcanic rock formed by ejection from a volcano as a molten blob and cooled in the air to form discrete grains called clasts.Neuendorf, K.K.E., J.P. Mehl, Jr., and J.A. Jackson, eds. (2005) ''Glossary of Geology'' (5th ed.). Alexandria, Virginia, American Geological Institute. 779 pp. It is typically dark in color (brown, black or purplish-red), and basaltic or andesitic in composition. Scoria has relatively low density, as it is riddled with macroscopic ellipsoidal vesicles (gas bubbles), but in contrast to pumice, scoria always has a specific gravity greater than 1 and sinks in water. Scoria may form as part of a lava flow, typically near its surface, or as fragmental ejecta ( lapilli, blocks, and bombs), for instance in Strombolian eruptions that form steep-sided scoria cones, also called cinder cones. Scoria's holes or vesicles form when gases dissolved in the original magma come out of solution as it er ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
