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Železná Hůrka
Železná hůrka (german: Eisenbühl) is an extinct Quaternary volcano and a Protected areas of the Czech Republic, national nature monument in the Fichtel Mountains in the Czech Republic. Location Železná hůrka is located about 1 km south of Mýtina in the Lipová (Cheb District), Lipová municipality, in Cheb District in the Karlovy Vary Region of the Czech Republic. It lies in the easternmost part of the Fichtel Mountains. The area has also other manifestations of volcanic activity. Another Quaternary volcano, Komorní hůrka, is located nearby. CO2 outgassing occurs in the area. Metallic iron The name means "iron hill" in Czech. Fragments of metallic iron are found in the local basalt deposits. Iron usually occurs on Earth only in the oxidized form, as iron ore, and needs to be processed into metallic iron by smelting. It is thought that in the Železná hůrka area, iron-rich magma entered coal deposits which caused iron compounds to be reduced to metallic iron, in a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fichtel Mountains
The Fichtel MountainsRandlesome, C. et al. (2011). ''Business Cultures in Europe'', 2nd ed., Routledge, Abingdon and New York, p. 52. . (german: Fichtelgebirge, cs, Smrčiny), form a small horseshoe-shaped mountain range in northeastern Bavaria, Germany. They extend from the valley of the Red Main River to the Czech border, a few foothills spilling over into the Czech Republic. They continue in a northeasterly direction as the Elster Mountains, and in a southeasterly direction as the Upper Palatine Forest. The Fichtel Mountains contain an important nature park, the Fichtel Mountain Nature Park, with an area of . Etymology The first person to write about the Fichtel Mountains, Matthias of Kemnath (actually Matthias Widmann, born 23 February 1429 in Kemnath) reported in 1476: ''Ein bergk, hoch, weitt, wolbekant ligt in Beiern, gnant der Fichtelberg'' ("A mountain, high, wide and well-known, lies in Bavaria, known as the Fichtelberg"). In descriptions of the border in 1499 and 15 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Železná Hůrka červenec 2015 (3)
Železná may refer to: *Železná (Beroun District), village and municipality in the Central Bohemian Region of the Czech Republic * Železná Breznica, village and municipality of the Zvolen District in the Banská Bystrica Region of Slovakia * Železná Ruda, town in the Pilsen Region of the Czech Republic See also * Bratislava Železná studienka railway station, Bratislava, Slovakia * Železný (male form) * Železnice *Železnik Železnik ( sr-cyr, Железник, ) is an urban neighborhood of Belgrade, Serbia. It is located in Belgrade's municipality of Čukarica. Location Železnik is located in the central part of the Čukarica municipality, southwest from downt ... * Železniki * Železné * Železník (other) * Željeznica (other) {{DEFAULTSORT:Zelezna ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Maar
A maar is a broad, low-relief volcanic crater caused by a phreatomagmatic eruption (an explosion which occurs when groundwater comes into contact with hot lava or magma). A maar characteristically fills with water to form a relatively shallow crater lake which may also be called a maar. The name comes from a Moselle Franconian dialect word used for the circular lakes of the Daun area of Germany. Notes: * According to German Wikipedia's ''"Maar"'' article, in 1544 in his book ''Cosmographia'', Sebastian Münster (1488–1552) first applied the word "maar" (as ''Marh'') to the Ulmener Maar and the Laacher See. See: Sebastian Münster, ''Cosmographia'' (Basel, Switzerland: Heinrich Petri, 1544)p. 341. From p. 341: ''"Item zwen namhafftiger seen seind in der Eyfel / einer bey de schloß Ulmen / und ein ander bey dem Closter züm Laich / die seind sere tieff / habe kein ynflüß aber vil außflüß / die nennet man Marh unnd seind fischreich."'' (Also two noteworthy lakes are ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lapilli
Lapilli is a size classification of tephra, which is material that falls out of the air during a volcanic eruption or during some meteorite impacts. ''Lapilli'' (singular: ''lapillus'') is Latin for "little stones". By definition lapilli range from in diameter. A pyroclastic particle greater than 64 mm in diameter is known as a volcanic bomb when molten, or a volcanic block when solid. Pyroclastic material with particles less than 2 mm in diameter is referred to as volcanic ash. Formation Lapilli are spheroid-, teardrop-, dumbbell- or button-shaped droplets of molten or semi-molten lava ejected from a volcanic eruption that fall to earth while still at least partially molten. These granules are not accretionary, but instead the direct result of liquid rock cooling as it travels through the air. Lapilli tuffs are a very common form of volcanic rock typical of rhyolite, andesite and dacite pyroclastic eruptions, where thick layers of lapilli can be deposited during a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Volcanic Bomb
A volcanic bomb or lava bomb is a mass of partially molten rock (tephra) larger than 64 mm (2.5 inches) in diameter, formed when a volcano ejects viscous fragments of lava during an eruption. Because volcanic bombs cool after they leave the volcano, they are extrusive igneous rocks. Volcanic bombs can be thrown many kilometres from an erupting vent, and often acquire aerodynamic shapes during their flight. Bombs can be extremely large; the 1935 eruption of Mount Asama in Japan expelled bombs measuring 5–6 m (16-20 ft) in diameter up to from the vent. Volcanic bombs are a significant volcanic hazard, and can cause severe injuries and death to people in an eruption zone. One such incident occurred at Galeras volcano in Colombia in 1993; six people near the summit were killed and several seriously injured by lava bombs when the volcano erupted unexpectedly. On July 16, 2018, 23 people were injured on a tour boat near the Kilauea volcano as a result of a basketb ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phreatomagmatic Eruptions
Phreatomagmatic eruptions are volcanic eruptions resulting from interaction between magma and water. They differ from exclusively magmatic eruptions and phreatic eruptions. Unlike phreatic eruptions, the products of phreatomagmatic eruptions contain juvenile (magmatic) clasts.Heiken, G. & Wohletz, K. 1985. Volcanic Ash. University of California Press, Berkeley It is common for a large explosive eruption to have magmatic and phreatomagmatic components. Mechanisms Several competing theories exist as to the exact mechanism of ash formation. The most common is the theory of explosive thermal contraction of particles under rapid cooling from contact with water. In many cases the water is supplied by the sea, for example with Surtsey. In other cases the water may be present in a lake or caldera-lake, for example Santorini, where the phreatomagmatic component of the Minoan eruption was a result of both a lake and later the sea. There have also been examples of interaction between magma a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Volcanic Cone
Volcanic cones are among the simplest volcanic landforms. They are built by ejecta from a volcanic vent, piling up around the vent in the shape of a cone with a central crater. Volcanic cones are of different types, depending upon the nature and size of the fragments ejected during the eruption. Types of volcanic cones include stratocones, spatter cones, tuff cones, and cinder cones. Stratocone Stratocones are large cone-shaped volcanoes made up of lava flows, explosively erupted pyroclastic rocks, and igneous intrusives that are typically centered around a cylindrical vent. Unlike shield volcanoes, they are characterized by a steep profile and periodic, often alternating, explosive eruptions and effusive eruptions. Some have collapsed craters called calderas. The central core of a stratocone is commonly dominated by a central core of intrusive rocks that range from around to over several kilometers in diameter. This central core is surrounded by multiple generations of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Disko Island
Disko Island ( kl, Qeqertarsuaq, da, Diskoøen) is a large island in Baffin Bay, off the west coast of Greenland. It has an area of ,Norwegian University of Science and Technology making it the second largest of Greenland after the main island and one of the 100 largest islands in the world. Etymology The name means ''The Large Island'' (from = island).Geography 
The island has a length of about , ri ...
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Quaternary
The Quaternary ( ) is the current and most recent of the three periods of the Cenozoic Era in the geologic time scale of the International Commission on Stratigraphy (ICS). It follows the Neogene Period and spans from 2.58 million years ago to the present. The Quaternary Period is divided into two epochs: the Pleistocene (2.58 million years ago to 11.7 thousand years ago) and the Holocene (11.7 thousand years ago to today, although a third epoch, the Anthropocene, has been proposed but is not yet officially recognised by the ICS). The Quaternary Period is typically defined by the cyclic growth and decay of continental ice sheets related to the Milankovitch cycles and the associated climate and environmental changes that they caused. Research history In 1759 Giovanni Arduino proposed that the geological strata of northern Italy could be divided into four successive formations or "orders" ( it, quattro ordini). The term "quaternary" was introduced by Jules Desnoye ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Smelting
Smelting is a process of applying heat to ore, to extract a base metal. It is a form of extractive metallurgy. It is used to extract many metals from their ores, including silver, iron, copper, and other base metals. Smelting uses heat and a chemical reducing agent to decompose the ore, driving off other elements as gases or slag and leaving the metal base behind. The reducing agent is commonly a fossil fuel source of carbon, such as coke—or, in earlier times, charcoal. The oxygen in the ore binds to carbon at high temperatures due to the lower potential energy of the bonds in carbon dioxide (). Smelting most prominently takes place in a blast furnace to produce pig iron, which is converted into steel. The carbon source acts as a chemical reactant to remove oxygen from the ore, yielding the purified metal element as a product. The carbon source is oxidized in two stages. First, the carbon (C) combusts with oxygen (O2) in the air to produce carbon monoxide (CO). Second, the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Karlovy Vary Region
The Karlovy Vary Region or Carlsbad Region ( cs, Karlovarský kraj, German: ''Karlsbader Region'') is an administrative unit ( cs, kraj) of the Czech Republic, located in the westernmost part of its historical region of Bohemia. It is named after its capital Karlovy Vary. Spas in the region include Karlovy Vary and Mariánské Lázně. Administrative divisions The Karlovy Vary Region is divided into 3 districts: At a lower level, the region has 134 municipalities, comprising 56 in the Karlovy Vary District, 40 in the Cheb District and 38 in the Sokolov District. Population Karlovy Vary Region is the smallest region in the Czech Republic with a population of less than 300,000. Only 11 municipalities have populations greater than 5,000. The largest municipality of the region is Karlovy Vary with a population of around 50,000. The table below shows the municipalities in Karlovy Vary Region with the largest population (as of 1 January 2019): Other significant towns in Karlovy ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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